TY  - CONF
AU  - Tanović, Dragoljub
AU  - Vorkapić, Miloš
AU  - Telebak, Katarina
AU  - Stojanović, Jagoš
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6365
AB  - The rising cost of fossil fuels has prompted a shift towards environmentally friendly alternative energy sources, leading to an expansion in the study of renewables. Wind turbines, specially those of the small-scale variety, have emerged as a promising solution for generating sustainable electricity, particularly in rural areas and for smaller consumers. This study focuses on the analysis of pitch angles for three-bladed horizontal axis wind turbines (HAWT) with a diameter of 1.35 m, classified as micro wind turbines. The analysis assumes incompressible and viscous flow, with shear stress transport (SST) equations closed by various turbulence models. The ANSYS program was used for conducting this analysis.
PB  - Belgrade : Innovation Center of Faculty of Mechanical Engineering
C3  - Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia
T1  - Effect of pitch angle on wind turbine performances
SP  - 68
EP  - 68
UR  - https://hdl.handle.net/21.15107/rcub_cer_6365
ER  - 

@conference{
author = "Tanović, Dragoljub and Vorkapić, Miloš and Telebak, Katarina and Stojanović, Jagoš",
year = "2023",
abstract = "The rising cost of fossil fuels has prompted a shift towards environmentally friendly alternative energy sources, leading to an expansion in the study of renewables. Wind turbines, specially those of the small-scale variety, have emerged as a promising solution for generating sustainable electricity, particularly in rural areas and for smaller consumers. This study focuses on the analysis of pitch angles for three-bladed horizontal axis wind turbines (HAWT) with a diameter of 1.35 m, classified as micro wind turbines. The analysis assumes incompressible and viscous flow, with shear stress transport (SST) equations closed by various turbulence models. The ANSYS program was used for conducting this analysis.",
publisher = "Belgrade : Innovation Center of Faculty of Mechanical Engineering",
journal = "Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia",
title = "Effect of pitch angle on wind turbine performances",
pages = "68-68",
url = "https://hdl.handle.net/21.15107/rcub_cer_6365"
}

Tanović, D., Vorkapić, M., Telebak, K.,& Stojanović, J.. (2023). Effect of pitch angle on wind turbine performances. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia
Belgrade : Innovation Center of Faculty of Mechanical Engineering., 68-68.
https://hdl.handle.net/21.15107/rcub_cer_6365

Tanović D, Vorkapić M, Telebak K, Stojanović J. Effect of pitch angle on wind turbine performances. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia. 2023;:68-68.
https://hdl.handle.net/21.15107/rcub_cer_6365 .

Tanović, Dragoljub, Vorkapić, Miloš, Telebak, Katarina, Stojanović, Jagoš, "Effect of pitch angle on wind turbine performances" in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia (2023):68-68,
https://hdl.handle.net/21.15107/rcub_cer_6365 .

TY  - CONF
AU  - Baltić, Marija
AU  - Vorkapić, Miloš
AU  - Simonović, Aleksandar
AU  - Ivanov, Toni
AU  - Tanović, Dragoljub
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6364
AB  - The utilization of biomaterials with mycelia as a stabilizing agent is gaining popularity in the fields of construction and architecture, offering a sustainable solution aligned with the principles of the circular economy. Interdisciplinary research involving biologists, technologists, and engineers is necessary to advance this field where science, art and design converge. These biomaterials contribute to energy reduction and cost-effectiveness, utilizing readily available and recyclable raw materials. Mycelium-based blocks have shown to be more affordable than traditional cement and gypsum blocks while significantly reducing CO2 emissions. The mycelium network, formed by hyphae, can be cultivated into a solid material, providing a defined technological process. This study focusses on performing 3-point bending testing on moulded specimens using additive technology PLA material, following the ASTM D1037 standard. After the growth of mycelium and the formation of the test tube-shaped structure, the samples are dried and characterized to enchance their mechanical characteristics.
PB  - Belgrade : Innovation Center of Faculty of Mechanical Engineering
C3  - Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia
T1  - Assembling biomaterial specimens in a mould made of thermoplastic polymer: 3-point bending test
SP  - 28
EP  - 28
UR  - https://hdl.handle.net/21.15107/rcub_cer_6364
ER  - 

@conference{
author = "Baltić, Marija and Vorkapić, Miloš and Simonović, Aleksandar and Ivanov, Toni and Tanović, Dragoljub",
year = "2023",
abstract = "The utilization of biomaterials with mycelia as a stabilizing agent is gaining popularity in the fields of construction and architecture, offering a sustainable solution aligned with the principles of the circular economy. Interdisciplinary research involving biologists, technologists, and engineers is necessary to advance this field where science, art and design converge. These biomaterials contribute to energy reduction and cost-effectiveness, utilizing readily available and recyclable raw materials. Mycelium-based blocks have shown to be more affordable than traditional cement and gypsum blocks while significantly reducing CO2 emissions. The mycelium network, formed by hyphae, can be cultivated into a solid material, providing a defined technological process. This study focusses on performing 3-point bending testing on moulded specimens using additive technology PLA material, following the ASTM D1037 standard. After the growth of mycelium and the formation of the test tube-shaped structure, the samples are dried and characterized to enchance their mechanical characteristics.",
publisher = "Belgrade : Innovation Center of Faculty of Mechanical Engineering",
journal = "Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia",
title = "Assembling biomaterial specimens in a mould made of thermoplastic polymer: 3-point bending test",
pages = "28-28",
url = "https://hdl.handle.net/21.15107/rcub_cer_6364"
}

Baltić, M., Vorkapić, M., Simonović, A., Ivanov, T.,& Tanović, D.. (2023). Assembling biomaterial specimens in a mould made of thermoplastic polymer: 3-point bending test. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia
Belgrade : Innovation Center of Faculty of Mechanical Engineering., 28-28.
https://hdl.handle.net/21.15107/rcub_cer_6364

Baltić M, Vorkapić M, Simonović A, Ivanov T, Tanović D. Assembling biomaterial specimens in a mould made of thermoplastic polymer: 3-point bending test. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia. 2023;:28-28.
https://hdl.handle.net/21.15107/rcub_cer_6364 .

Baltić, Marija, Vorkapić, Miloš, Simonović, Aleksandar, Ivanov, Toni, Tanović, Dragoljub, "Assembling biomaterial specimens in a mould made of thermoplastic polymer: 3-point bending test" in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia (2023):28-28,
https://hdl.handle.net/21.15107/rcub_cer_6364 .

TY  - CONF
AU  - Baltić, Marija
AU  - Ivanović, Milica
AU  - Stamenković, Igor
AU  - Vorkapić, Miloš
AU  - Simonović, Aleksandar
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6828
AB  - The manufacturing and application of biocomposites are remarkable achievements in replacing conventional non-biodegradable materials. In general, biocomposites are made up of biopolymers and bio-based reinforcing agents. Biofibres are also the main constituents of biocomposites, which are generated from biological entities such as crop fibres (cotton, flax, mycelium of fungi, hemp), recycled wood, wastepaper, agro-based by-products or regenerated cellulose fibre. In this paper, a mould intended for biocomposites based on mycelium and an adequate substrate is tested. The primary purpose of the mould is to bring the loose natural material into a solid preparation following the standards ASTM D7250 and ASTM D1037, which include testing the technologically prepared and hardened sample for tensile and pressure. Development and moulding of biocomposite are the technological processes of drying after sowing mycelium so that a variant of the mould with a perforated upper part was used to harden the samples thoroughly. In the mould, realization is used PLA thermoplastic filaments. Mould was made as an assembly of two parts, and its shape is like a dog bone, according to the mentioned standards. This polymer enclosure is helpful for other biocomposite structures (a mixture of different fungi species and adequate substrates).
AB  - Proizvodnja i primena biokompozita je značajno doprinela smanjenju upotrebe nebiorazgradivih materijala. U opštem smislu, biokompoziti se sastoje od biorazgradivih prirodnih polimera (biopolimera) i ojačavajuće faze-biovlakana. Biovlakna su glavni sastojci ovih materijala i mogu biti različitog prirodnog porekla (pamuk, lan, konoplja, micelije gljiva, reciklirano drvo, agroproizvodi ili regenerisana celulozna vlakna). U ovom radu, testiran je i razvijen kalup za biokompozite na bazi micelijuma i odgovarajućeg supstrata (pšenične slame). Osnovna namena kalupa je priprema i očvršćavanje bio materijala da bi bilo omugućeno ispitivanje u skladu sa standardima ASTM D7250 i ASTM D1037, koji su namenjeni ispitivanju uzoraka na istezanje i pritisak. Izrada i 
oblikovanje biokompozita predstavljaju tehnološke postupke koji se sprovode u cilju sušenja i smanjenja procenta vlage nakon zasejavanja, pri čemu je gornji deo perforiran zbog isparavanja i što boljeg očvršćavanja uzoraka. Za proizvodnju kalupa upotrebljen je PLA termoplastični filament. 
Kalup je izrađen kao dvodelni sklop, oblika “dog bone” u skladu sa pomenutim standardima. 
Ovako pripremljen i sklopljen kalup je moguće primeniti i za ispitivanje ostalih biokompozitnih 
struktura (mešavina različitih vrsta fungi i odgovarajućih supstrata).
PB  - Union of Mechanical and Electrical Engineers and Technicains of Serbia (SMEITS)
PB  - Belgrade : Society for Renewable Electrical Power Sources
C3  - Proceedings - 11th International Conference on Renewable Electrical Power Sources, ICREPS 2023, November 02-03, 2023, Belgrade
T1  - Polymer mould manufacturing for tensile testing of biocomposite materials
T1  - Postupak izrade polimernog kalupa za ispitivanje na istezanje biokompozitnih materijala
SP  - 421
EP  - 426
UR  - https://hdl.handle.net/21.15107/rcub_cer_6828
ER  - 

@conference{
author = "Baltić, Marija and Ivanović, Milica and Stamenković, Igor and Vorkapić, Miloš and Simonović, Aleksandar",
year = "2023",
abstract = "The manufacturing and application of biocomposites are remarkable achievements in replacing conventional non-biodegradable materials. In general, biocomposites are made up of biopolymers and bio-based reinforcing agents. Biofibres are also the main constituents of biocomposites, which are generated from biological entities such as crop fibres (cotton, flax, mycelium of fungi, hemp), recycled wood, wastepaper, agro-based by-products or regenerated cellulose fibre. In this paper, a mould intended for biocomposites based on mycelium and an adequate substrate is tested. The primary purpose of the mould is to bring the loose natural material into a solid preparation following the standards ASTM D7250 and ASTM D1037, which include testing the technologically prepared and hardened sample for tensile and pressure. Development and moulding of biocomposite are the technological processes of drying after sowing mycelium so that a variant of the mould with a perforated upper part was used to harden the samples thoroughly. In the mould, realization is used PLA thermoplastic filaments. Mould was made as an assembly of two parts, and its shape is like a dog bone, according to the mentioned standards. This polymer enclosure is helpful for other biocomposite structures (a mixture of different fungi species and adequate substrates)., Proizvodnja i primena biokompozita je značajno doprinela smanjenju upotrebe nebiorazgradivih materijala. U opštem smislu, biokompoziti se sastoje od biorazgradivih prirodnih polimera (biopolimera) i ojačavajuće faze-biovlakana. Biovlakna su glavni sastojci ovih materijala i mogu biti različitog prirodnog porekla (pamuk, lan, konoplja, micelije gljiva, reciklirano drvo, agroproizvodi ili regenerisana celulozna vlakna). U ovom radu, testiran je i razvijen kalup za biokompozite na bazi micelijuma i odgovarajućeg supstrata (pšenične slame). Osnovna namena kalupa je priprema i očvršćavanje bio materijala da bi bilo omugućeno ispitivanje u skladu sa standardima ASTM D7250 i ASTM D1037, koji su namenjeni ispitivanju uzoraka na istezanje i pritisak. Izrada i 
oblikovanje biokompozita predstavljaju tehnološke postupke koji se sprovode u cilju sušenja i smanjenja procenta vlage nakon zasejavanja, pri čemu je gornji deo perforiran zbog isparavanja i što boljeg očvršćavanja uzoraka. Za proizvodnju kalupa upotrebljen je PLA termoplastični filament. 
Kalup je izrađen kao dvodelni sklop, oblika “dog bone” u skladu sa pomenutim standardima. 
Ovako pripremljen i sklopljen kalup je moguće primeniti i za ispitivanje ostalih biokompozitnih 
struktura (mešavina različitih vrsta fungi i odgovarajućih supstrata).",
publisher = "Union of Mechanical and Electrical Engineers and Technicains of Serbia (SMEITS), Belgrade : Society for Renewable Electrical Power Sources",
journal = "Proceedings - 11th International Conference on Renewable Electrical Power Sources, ICREPS 2023, November 02-03, 2023, Belgrade",
title = "Polymer mould manufacturing for tensile testing of biocomposite materials, Postupak izrade polimernog kalupa za ispitivanje na istezanje biokompozitnih materijala",
pages = "421-426",
url = "https://hdl.handle.net/21.15107/rcub_cer_6828"
}

Baltić, M., Ivanović, M., Stamenković, I., Vorkapić, M.,& Simonović, A.. (2023). Polymer mould manufacturing for tensile testing of biocomposite materials. in Proceedings - 11th International Conference on Renewable Electrical Power Sources, ICREPS 2023, November 02-03, 2023, Belgrade
Union of Mechanical and Electrical Engineers and Technicains of Serbia (SMEITS)., 421-426.
https://hdl.handle.net/21.15107/rcub_cer_6828

Baltić M, Ivanović M, Stamenković I, Vorkapić M, Simonović A. Polymer mould manufacturing for tensile testing of biocomposite materials. in Proceedings - 11th International Conference on Renewable Electrical Power Sources, ICREPS 2023, November 02-03, 2023, Belgrade. 2023;:421-426.
https://hdl.handle.net/21.15107/rcub_cer_6828 .

Baltić, Marija, Ivanović, Milica, Stamenković, Igor, Vorkapić, Miloš, Simonović, Aleksandar, "Polymer mould manufacturing for tensile testing of biocomposite materials" in Proceedings - 11th International Conference on Renewable Electrical Power Sources, ICREPS 2023, November 02-03, 2023, Belgrade (2023):421-426,
https://hdl.handle.net/21.15107/rcub_cer_6828 .

TY  - JOUR
AU  - Manić, Nebojša
AU  - Janković, Bojan
AU  - Stojiljković, Dragoslava
AU  - Popović, Mina
AU  - Cvetković, Slobodan
AU  - Mikulčić, Hrvoje
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5594
AB  - The actual paper analyses the performance of different energy crop biomasses, Miscanthus x giganteus Greef et Deu (EC-1) and Arundo donax L. (EC-2) stems, during slow pyrolysis process monitored by simultaneous TG-DTG-MS techniques, through chemical exergy analysis. In addition to considering the physical and chemical characteristics of given feedstocks for their efficient thermo-chemical conversion into pyrolytic gas, in this study, a theoretical simulation for their implementation use in the gasification process was also performed. The performed thermodynamic study with detailed exergy analysis showed that the large contribution of exergy in syngas components such as CO and H2 originates primarily from cellulose pyrolysis of EC-1, while large exergy contribution in syngas component as CH4 originates from lignin pyrolysis of EC-2. It was founded that the exergy efficiency of syngas for EC-1 equals 19.04%, which is lower than the exergy efficiency of syngas for EC-2 (20.46%), as a result of higher ash content in EC-1. Also, it was reported that higher carbon (C) and hydrogen (H) contents present in the EC-2 sample generate higher gaseous energy and exergy values, i.e. the increment of exergy efficiency of syngas, by both approaches (pyrolysis and gasification exergy analysis), but results in a lower biomass chemical exergy (18.28 MJ kg−1). The methodology applied to the gasification process was shown a higher exergy efficiency for EC-2 (∼36 – 42%) than for EC-1 (∼33 – 39%), dependant on the equivalence ratio (ER).
PB  - Elsevier B.V.
T2  - Thermochimica Acta
T1  - Thermodynamic study on energy crops thermochemical conversion to increase the efficiency of energy production
VL  - 719
SP  - 179408
DO  - 10.1016/j.tca.2022.179408
ER  - 

@article{
author = "Manić, Nebojša and Janković, Bojan and Stojiljković, Dragoslava and Popović, Mina and Cvetković, Slobodan and Mikulčić, Hrvoje",
year = "2023",
abstract = "The actual paper analyses the performance of different energy crop biomasses, Miscanthus x giganteus Greef et Deu (EC-1) and Arundo donax L. (EC-2) stems, during slow pyrolysis process monitored by simultaneous TG-DTG-MS techniques, through chemical exergy analysis. In addition to considering the physical and chemical characteristics of given feedstocks for their efficient thermo-chemical conversion into pyrolytic gas, in this study, a theoretical simulation for their implementation use in the gasification process was also performed. The performed thermodynamic study with detailed exergy analysis showed that the large contribution of exergy in syngas components such as CO and H2 originates primarily from cellulose pyrolysis of EC-1, while large exergy contribution in syngas component as CH4 originates from lignin pyrolysis of EC-2. It was founded that the exergy efficiency of syngas for EC-1 equals 19.04%, which is lower than the exergy efficiency of syngas for EC-2 (20.46%), as a result of higher ash content in EC-1. Also, it was reported that higher carbon (C) and hydrogen (H) contents present in the EC-2 sample generate higher gaseous energy and exergy values, i.e. the increment of exergy efficiency of syngas, by both approaches (pyrolysis and gasification exergy analysis), but results in a lower biomass chemical exergy (18.28 MJ kg−1). The methodology applied to the gasification process was shown a higher exergy efficiency for EC-2 (∼36 – 42%) than for EC-1 (∼33 – 39%), dependant on the equivalence ratio (ER).",
publisher = "Elsevier B.V.",
journal = "Thermochimica Acta",
title = "Thermodynamic study on energy crops thermochemical conversion to increase the efficiency of energy production",
volume = "719",
pages = "179408",
doi = "10.1016/j.tca.2022.179408"
}

Manić, N., Janković, B., Stojiljković, D., Popović, M., Cvetković, S.,& Mikulčić, H.. (2023). Thermodynamic study on energy crops thermochemical conversion to increase the efficiency of energy production. in Thermochimica Acta
Elsevier B.V.., 719, 179408.
https://doi.org/10.1016/j.tca.2022.179408

Manić N, Janković B, Stojiljković D, Popović M, Cvetković S, Mikulčić H. Thermodynamic study on energy crops thermochemical conversion to increase the efficiency of energy production. in Thermochimica Acta. 2023;719:179408.
doi:10.1016/j.tca.2022.179408 .

Manić, Nebojša, Janković, Bojan, Stojiljković, Dragoslava, Popović, Mina, Cvetković, Slobodan, Mikulčić, Hrvoje, "Thermodynamic study on energy crops thermochemical conversion to increase the efficiency of energy production" in Thermochimica Acta, 719 (2023):179408,
https://doi.org/10.1016/j.tca.2022.179408 . .

TY  - JOUR
AU  - Janković, Bojan
AU  - Manić, Nebojša
AU  - Popović, Mina
AU  - Cvetković, Slobodan
AU  - Dželetović, Željko
AU  - Stojiljković, Dragoslava
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5647
AB  - This work provides insight into possibilities of maximum utilization of C3-C4 energy crops for thermo-chemical conversion (slow pyrolysis) into high value biochemicals, platform chemicals, drop-in fuels and combustible gases, using coupled kinetic and thermodynamic analyses. In order to examine the kinetics of decomposition of lignocellulosic components, model-free and model-based methods faded from thermal analysis data were used. Thermodynamic compensation was used for explicatory of entropy controlled process, where conformational changes and chemical exchange directly affect the type and distribution of obtained pyrolytic products. It was shown that external variable (i.e. the heating rate/temperature) does not change either an entire reaction mechanism (mechanistic nature of MG and AD pyrolyses) or transition state, but it changes activation enthalpy and activation entropy which lead to differences in terms of heat energy consumption, pyrolysis favorability and thus rates of generation of activated complex among feedstocks. To investigate the interplay of catalysts (present in feedstocks as minerals) and reactants, selective energy transfer (SET) model was applied. The model showed an activity of catalyst with different outputs towards two reactants, lignin part of the structure in MG and 1,8-cineole in AD. It was shown that AD is more convenient for thermal conversion than MG, regarding to lower transformation energy requirement, higher reactivity, as well as much faster accumulation of products.
PB  - Elsevier B.V.
T2  - Industrial Crops and Products
T1  - Kinetic and thermodynamic compensation phenomena in C3 and C4 energy crops pyrolysis: Implications on reaction mechanisms and product distributions
VL  - 194
SP  - 116275
DO  - 10.1016/j.indcrop.2023.116275
ER  - 

@article{
author = "Janković, Bojan and Manić, Nebojša and Popović, Mina and Cvetković, Slobodan and Dželetović, Željko and Stojiljković, Dragoslava",
year = "2023",
abstract = "This work provides insight into possibilities of maximum utilization of C3-C4 energy crops for thermo-chemical conversion (slow pyrolysis) into high value biochemicals, platform chemicals, drop-in fuels and combustible gases, using coupled kinetic and thermodynamic analyses. In order to examine the kinetics of decomposition of lignocellulosic components, model-free and model-based methods faded from thermal analysis data were used. Thermodynamic compensation was used for explicatory of entropy controlled process, where conformational changes and chemical exchange directly affect the type and distribution of obtained pyrolytic products. It was shown that external variable (i.e. the heating rate/temperature) does not change either an entire reaction mechanism (mechanistic nature of MG and AD pyrolyses) or transition state, but it changes activation enthalpy and activation entropy which lead to differences in terms of heat energy consumption, pyrolysis favorability and thus rates of generation of activated complex among feedstocks. To investigate the interplay of catalysts (present in feedstocks as minerals) and reactants, selective energy transfer (SET) model was applied. The model showed an activity of catalyst with different outputs towards two reactants, lignin part of the structure in MG and 1,8-cineole in AD. It was shown that AD is more convenient for thermal conversion than MG, regarding to lower transformation energy requirement, higher reactivity, as well as much faster accumulation of products.",
publisher = "Elsevier B.V.",
journal = "Industrial Crops and Products",
title = "Kinetic and thermodynamic compensation phenomena in C3 and C4 energy crops pyrolysis: Implications on reaction mechanisms and product distributions",
volume = "194",
pages = "116275",
doi = "10.1016/j.indcrop.2023.116275"
}

Janković, B., Manić, N., Popović, M., Cvetković, S., Dželetović, Ž.,& Stojiljković, D.. (2023). Kinetic and thermodynamic compensation phenomena in C3 and C4 energy crops pyrolysis: Implications on reaction mechanisms and product distributions. in Industrial Crops and Products
Elsevier B.V.., 194, 116275.
https://doi.org/10.1016/j.indcrop.2023.116275

Janković B, Manić N, Popović M, Cvetković S, Dželetović Ž, Stojiljković D. Kinetic and thermodynamic compensation phenomena in C3 and C4 energy crops pyrolysis: Implications on reaction mechanisms and product distributions. in Industrial Crops and Products. 2023;194:116275.
doi:10.1016/j.indcrop.2023.116275 .

Janković, Bojan, Manić, Nebojša, Popović, Mina, Cvetković, Slobodan, Dželetović, Željko, Stojiljković, Dragoslava, "Kinetic and thermodynamic compensation phenomena in C3 and C4 energy crops pyrolysis: Implications on reaction mechanisms and product distributions" in Industrial Crops and Products, 194 (2023):116275,
https://doi.org/10.1016/j.indcrop.2023.116275 . .

TY  - JOUR
AU  - Janković, Bojan Ž.
AU  - Kojić, Marija
AU  - Milošević, Milena
AU  - Rosić, Milena
AU  - Waisi, Hadi
AU  - Božilović, Bojana
AU  - Manić, Nebojša
AU  - Dodevski, Vladimir
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7162
AB  - Thermo-chemical conversion via the pyrolysis of cigarette butt (CB) filters was successfully valorized and upcycled in the pre-carbonization and carbonization stages. The pre-carbonization stage (devolatilization) of the precursor material (cellulose acetate filter, r-CAcF) was analyzed by micro-scale experiments under non-isothermal conditions using TG-DTG-DTA and DSC techniques. The results of a detailed kinetic study showed that the decomposition of r-CAcF takes place via complex mechanisms, including consecutive reaction steps and two single-step reactions. Consecutive stages include the α-transition referred to as a cellulose polymorphic transformation (cellulose I → II) through crystallization mechanism changes, where a more thermodynamically ordered system was obtained. It was found that the transformation rate of cellulose I → II (‘cellulose regeneration’) is strongly affected by the presence of alkali metals and the deacetylation process. Two single-step reactions showed significant overlapping behavior, which involves a nucleation-controlled scission mechanism (producing levoglucosan, gaseous products, and abundant radicals) and hydrolytic decomposition of cellulose by catalytic cleavage of glycosidic bonds with the presence of an acidic catalyst. A macro-scale experiment showed that the operating temperature and heating rate had the most notable effects on the total surface area of the manufactured carbon. A substantial degree of mesoporosity with a median pore radius of 3.1695 nm was identified. The presence of macroporosity on the carbon surface and acidic surface functional groups was observed.
T2  - Polymers
T1  - Upcycling of the Used Cigarette Butt Filters through Pyrolysis Process: Detailed Kinetic Mechanism with Bio-Char Characterization
VL  - 15
IS  - 14
SP  - 3054
DO  - 10.3390/polym15143054
ER  - 

@article{
author = "Janković, Bojan Ž. and Kojić, Marija and Milošević, Milena and Rosić, Milena and Waisi, Hadi and Božilović, Bojana and Manić, Nebojša and Dodevski, Vladimir",
year = "2023",
abstract = "Thermo-chemical conversion via the pyrolysis of cigarette butt (CB) filters was successfully valorized and upcycled in the pre-carbonization and carbonization stages. The pre-carbonization stage (devolatilization) of the precursor material (cellulose acetate filter, r-CAcF) was analyzed by micro-scale experiments under non-isothermal conditions using TG-DTG-DTA and DSC techniques. The results of a detailed kinetic study showed that the decomposition of r-CAcF takes place via complex mechanisms, including consecutive reaction steps and two single-step reactions. Consecutive stages include the α-transition referred to as a cellulose polymorphic transformation (cellulose I → II) through crystallization mechanism changes, where a more thermodynamically ordered system was obtained. It was found that the transformation rate of cellulose I → II (‘cellulose regeneration’) is strongly affected by the presence of alkali metals and the deacetylation process. Two single-step reactions showed significant overlapping behavior, which involves a nucleation-controlled scission mechanism (producing levoglucosan, gaseous products, and abundant radicals) and hydrolytic decomposition of cellulose by catalytic cleavage of glycosidic bonds with the presence of an acidic catalyst. A macro-scale experiment showed that the operating temperature and heating rate had the most notable effects on the total surface area of the manufactured carbon. A substantial degree of mesoporosity with a median pore radius of 3.1695 nm was identified. The presence of macroporosity on the carbon surface and acidic surface functional groups was observed.",
journal = "Polymers",
title = "Upcycling of the Used Cigarette Butt Filters through Pyrolysis Process: Detailed Kinetic Mechanism with Bio-Char Characterization",
volume = "15",
number = "14",
pages = "3054",
doi = "10.3390/polym15143054"
}

Janković, B. Ž., Kojić, M., Milošević, M., Rosić, M., Waisi, H., Božilović, B., Manić, N.,& Dodevski, V.. (2023). Upcycling of the Used Cigarette Butt Filters through Pyrolysis Process: Detailed Kinetic Mechanism with Bio-Char Characterization. in Polymers, 15(14), 3054.
https://doi.org/10.3390/polym15143054

Janković BŽ, Kojić M, Milošević M, Rosić M, Waisi H, Božilović B, Manić N, Dodevski V. Upcycling of the Used Cigarette Butt Filters through Pyrolysis Process: Detailed Kinetic Mechanism with Bio-Char Characterization. in Polymers. 2023;15(14):3054.
doi:10.3390/polym15143054 .

Janković, Bojan Ž., Kojić, Marija, Milošević, Milena, Rosić, Milena, Waisi, Hadi, Božilović, Bojana, Manić, Nebojša, Dodevski, Vladimir, "Upcycling of the Used Cigarette Butt Filters through Pyrolysis Process: Detailed Kinetic Mechanism with Bio-Char Characterization" in Polymers, 15, no. 14 (2023):3054,
https://doi.org/10.3390/polym15143054 . .

TY  - JOUR
AU  - Anđelković, Ljubica
AU  - Šuljagić, Marija
AU  - Mirković, Miljana
AU  - Pavlović, Vera
AU  - Petronijević, Ivan
AU  - Stanković, Dalibor
AU  - Jeremić, Dejan
AU  - Uskoković, Vuk
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6199
AB  - The combination of an intense absorption of visible light and p-type semiconducting nature makes spinel cobalt oxide (Co3O4) a very attractive material for various optoelectronic applications. However, the traditional methods for its synthesis have been either time- and energy-consuming or relying on toxic chemicals. To solve this issue, a simple, facile, and eco-friendly method of synthesis was successfully developed to obtain spinel Co3O4 nanoparticles. The novel method for obtaining pure and monophasic Co3O4 reported here is based on the thermal decomposition of hexaaquacobalt(II) D-camphor10-sulfonate at 900 °C. This fast solid-state synthesis route overcomes the disadvantages of many combustion methods, most critically by avoiding the use of toxic organic solvents. The synthesized material was subjected to a detailed characterization to assess its potential for use as a nanocatalyst. The band gap measurements indicated the presence of two band gaps, one at 2.10 eV and another at 1.22 eV, confirming the purity and semiconducting properties of the sample. The electrochemical studies demonstrated a significant enhancement in the electron transfer kinetics with the addition of the synthesized Co3O4 to the carbon-paste electrode, leading to an enhanced electrocatalytic performance. These prominent functional properties, suitable for a wide range of technological applications, pave way for the implementation of the reported method for the synthesis of Co3O4 on a larger industrial scale.
PB  - Elsevier
T2  - Ceramics International
T1  - Semiconducting cobalt oxide nanocatalyst obtained through an eco-friendly thermal decomposition
DO  - 10.1016/j.ceramint.2023.04.182
ER  - 

@article{
author = "Anđelković, Ljubica and Šuljagić, Marija and Mirković, Miljana and Pavlović, Vera and Petronijević, Ivan and Stanković, Dalibor and Jeremić, Dejan and Uskoković, Vuk",
year = "2023",
abstract = "The combination of an intense absorption of visible light and p-type semiconducting nature makes spinel cobalt oxide (Co3O4) a very attractive material for various optoelectronic applications. However, the traditional methods for its synthesis have been either time- and energy-consuming or relying on toxic chemicals. To solve this issue, a simple, facile, and eco-friendly method of synthesis was successfully developed to obtain spinel Co3O4 nanoparticles. The novel method for obtaining pure and monophasic Co3O4 reported here is based on the thermal decomposition of hexaaquacobalt(II) D-camphor10-sulfonate at 900 °C. This fast solid-state synthesis route overcomes the disadvantages of many combustion methods, most critically by avoiding the use of toxic organic solvents. The synthesized material was subjected to a detailed characterization to assess its potential for use as a nanocatalyst. The band gap measurements indicated the presence of two band gaps, one at 2.10 eV and another at 1.22 eV, confirming the purity and semiconducting properties of the sample. The electrochemical studies demonstrated a significant enhancement in the electron transfer kinetics with the addition of the synthesized Co3O4 to the carbon-paste electrode, leading to an enhanced electrocatalytic performance. These prominent functional properties, suitable for a wide range of technological applications, pave way for the implementation of the reported method for the synthesis of Co3O4 on a larger industrial scale.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Semiconducting cobalt oxide nanocatalyst obtained through an eco-friendly thermal decomposition",
doi = "10.1016/j.ceramint.2023.04.182"
}

Anđelković, L., Šuljagić, M., Mirković, M., Pavlović, V., Petronijević, I., Stanković, D., Jeremić, D.,& Uskoković, V.. (2023). Semiconducting cobalt oxide nanocatalyst obtained through an eco-friendly thermal decomposition. in Ceramics International
Elsevier..
https://doi.org/10.1016/j.ceramint.2023.04.182

Anđelković L, Šuljagić M, Mirković M, Pavlović V, Petronijević I, Stanković D, Jeremić D, Uskoković V. Semiconducting cobalt oxide nanocatalyst obtained through an eco-friendly thermal decomposition. in Ceramics International. 2023;.
doi:10.1016/j.ceramint.2023.04.182 .

Anđelković, Ljubica, Šuljagić, Marija, Mirković, Miljana, Pavlović, Vera, Petronijević, Ivan, Stanković, Dalibor, Jeremić, Dejan, Uskoković, Vuk, "Semiconducting cobalt oxide nanocatalyst obtained through an eco-friendly thermal decomposition" in Ceramics International (2023),
https://doi.org/10.1016/j.ceramint.2023.04.182 . .

TY  - JOUR
AU  - Baltić, Marija
AU  - Vorkapić, Miloš
AU  - Ivanović, Milica
AU  - Tanović, Dragoljub
AU  - Mladenović, Ivana
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6367
AB  - Composite materials and structures are widely used and applied in many
industries owing to their advantages, such as satisfactory stiffness-to-mass ratio
and corrosion resistance. However, during their operating life, responsible parts
subject to complex loads may change and their properties might deteriorate. To
ensure structural integrity it is necessary to monitor and regularly check the
performance of composite structures. This paper investigates the change of
frequency characteristics of two rectangular composite (carbon-epoxy) plates after
inflicting structural damage. Following the necessary preparation of the structure's
upper surfaces by white-and-black stochastic pattern, the responses (free
vibratory movement) of structures to momentary excitation were recorded by an
optical, contactless 3D digital image correlation (DIC) system that contains a set of
ultrafast cameras. In order to determine the natural frequencies of the plates, the
recorded time-domain responses were post-processed, i.e. converted to the
frequency domain by fast Fourier transform (FFT). The reduction in values of
natural frequencies is observed on the damaged structures. The performed
experiments demonstrate the applicability of the DIC method in the structural
health monitoring of composite parts.
PB  - Belgrade, Serbia : Balkan Scientific Centre
T2  - Tribology and Materials Journal
T1  - Modal analysis of composite plates: Digital image correlation method application
VL  - 2
IS  - 2
SP  - 62
EP  - 67
DO  - 10.46793/tribomat.2023.010
ER  - 

@article{
author = "Baltić, Marija and Vorkapić, Miloš and Ivanović, Milica and Tanović, Dragoljub and Mladenović, Ivana",
year = "2023",
abstract = "Composite materials and structures are widely used and applied in many
industries owing to their advantages, such as satisfactory stiffness-to-mass ratio
and corrosion resistance. However, during their operating life, responsible parts
subject to complex loads may change and their properties might deteriorate. To
ensure structural integrity it is necessary to monitor and regularly check the
performance of composite structures. This paper investigates the change of
frequency characteristics of two rectangular composite (carbon-epoxy) plates after
inflicting structural damage. Following the necessary preparation of the structure's
upper surfaces by white-and-black stochastic pattern, the responses (free
vibratory movement) of structures to momentary excitation were recorded by an
optical, contactless 3D digital image correlation (DIC) system that contains a set of
ultrafast cameras. In order to determine the natural frequencies of the plates, the
recorded time-domain responses were post-processed, i.e. converted to the
frequency domain by fast Fourier transform (FFT). The reduction in values of
natural frequencies is observed on the damaged structures. The performed
experiments demonstrate the applicability of the DIC method in the structural
health monitoring of composite parts.",
publisher = "Belgrade, Serbia : Balkan Scientific Centre",
journal = "Tribology and Materials Journal",
title = "Modal analysis of composite plates: Digital image correlation method application",
volume = "2",
number = "2",
pages = "62-67",
doi = "10.46793/tribomat.2023.010"
}

Baltić, M., Vorkapić, M., Ivanović, M., Tanović, D.,& Mladenović, I.. (2023). Modal analysis of composite plates: Digital image correlation method application. in Tribology and Materials Journal
Belgrade, Serbia : Balkan Scientific Centre., 2(2), 62-67.
https://doi.org/10.46793/tribomat.2023.010

Baltić M, Vorkapić M, Ivanović M, Tanović D, Mladenović I. Modal analysis of composite plates: Digital image correlation method application. in Tribology and Materials Journal. 2023;2(2):62-67.
doi:10.46793/tribomat.2023.010 .

Baltić, Marija, Vorkapić, Miloš, Ivanović, Milica, Tanović, Dragoljub, Mladenović, Ivana, "Modal analysis of composite plates: Digital image correlation method application" in Tribology and Materials Journal, 2, no. 2 (2023):62-67,
https://doi.org/10.46793/tribomat.2023.010 . .

TY  - JOUR
AU  - Vorkapić, Miloš
AU  - Živojinović, Danijela
AU  - Kreculj, Dragan
AU  - Ivanov, Toni
AU  - Baltić, Marija
AU  - Simonović, Aleksandar
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5887
AB  - Reverse engineering (RE) aims to design a new replacement part based on
the existing part. The goal is to perform a quality reproduction of the
physical part with the best possible mechanical characteristics aiming to
find optimal solutions regarding the shape and dimensions of the part. The
procedure is implemented through a series of steps: creating a digital 3D
model, improving model parameters, and realizing products using additive
technologies. In this paper, a review and implementation of the funda–
mental methodologies of RE were carried out on the example of a damaged
protective cover with an unknown geometry and material essential for the
function of a discontinued device with no technical documentation and
spare parts. An optical scanning method, 3D CAD, FEA, and additive
manufacturing were used to realize the reproduced part. It was shown that
by utilizing RE the lifecycle of the device could be significantly extended
with minimal cost.
AB  - Реверзбилни инжењеринг (РЕ) има за циљ да
пројектује нови заменски део на основу постојећег
дела. Поступак се спроводи кроз низ корака: израда
дигиталног 3Д модела, побољшање и оптимизација
параметара модела и реализација производа
применом адитивних технологија. Циљ је да се
изврши квалитетна репродукција физичког дела са
најбољим могућим механичким карактеристикама у
циљу проналажења оптималних решења у погледу
облика и димензија дела. У овом раду је извршен
преглед и имплементација основних методологија
РЕ на примеру оштећеног заштитног поклопца
непознате геометрије и материјала од суштинског
значаја за функционисање уређаја који се не
производи, а при томе нема расположиве техничке
документације и резервних делова. У реализацији
репродукованог дела коришћена је метода оптичког
скенирања, 3D CAD, FEA и адитивна производња.
Показало се да се коришћењем РE може значајно
продужити животни циклус уређаја уз минималне
трошкове.
PB  - Beograd : Mašinski fakultet
T2  - FME Transactions
T1  - Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts
T1  - Примена адитивне технологије и реверзибилног инжењерства у реализацији оштећених застарелих делова
VL  - 51
IS  - 1
SP  - 31
EP  - 38
DO  - 10.5937/fme2301031V
ER  - 

@article{
author = "Vorkapić, Miloš and Živojinović, Danijela and Kreculj, Dragan and Ivanov, Toni and Baltić, Marija and Simonović, Aleksandar",
year = "2023",
abstract = "Reverse engineering (RE) aims to design a new replacement part based on
the existing part. The goal is to perform a quality reproduction of the
physical part with the best possible mechanical characteristics aiming to
find optimal solutions regarding the shape and dimensions of the part. The
procedure is implemented through a series of steps: creating a digital 3D
model, improving model parameters, and realizing products using additive
technologies. In this paper, a review and implementation of the funda–
mental methodologies of RE were carried out on the example of a damaged
protective cover with an unknown geometry and material essential for the
function of a discontinued device with no technical documentation and
spare parts. An optical scanning method, 3D CAD, FEA, and additive
manufacturing were used to realize the reproduced part. It was shown that
by utilizing RE the lifecycle of the device could be significantly extended
with minimal cost., Реверзбилни инжењеринг (РЕ) има за циљ да
пројектује нови заменски део на основу постојећег
дела. Поступак се спроводи кроз низ корака: израда
дигиталног 3Д модела, побољшање и оптимизација
параметара модела и реализација производа
применом адитивних технологија. Циљ је да се
изврши квалитетна репродукција физичког дела са
најбољим могућим механичким карактеристикама у
циљу проналажења оптималних решења у погледу
облика и димензија дела. У овом раду је извршен
преглед и имплементација основних методологија
РЕ на примеру оштећеног заштитног поклопца
непознате геометрије и материјала од суштинског
значаја за функционисање уређаја који се не
производи, а при томе нема расположиве техничке
документације и резервних делова. У реализацији
репродукованог дела коришћена је метода оптичког
скенирања, 3D CAD, FEA и адитивна производња.
Показало се да се коришћењем РE може значајно
продужити животни циклус уређаја уз минималне
трошкове.",
publisher = "Beograd : Mašinski fakultet",
journal = "FME Transactions",
title = "Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts, Примена адитивне технологије и реверзибилног инжењерства у реализацији оштећених застарелих делова",
volume = "51",
number = "1",
pages = "31-38",
doi = "10.5937/fme2301031V"
}

Vorkapić, M., Živojinović, D., Kreculj, D., Ivanov, T., Baltić, M.,& Simonović, A.. (2023). Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts. in FME Transactions
Beograd : Mašinski fakultet., 51(1), 31-38.
https://doi.org/10.5937/fme2301031V

Vorkapić M, Živojinović D, Kreculj D, Ivanov T, Baltić M, Simonović A. Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts. in FME Transactions. 2023;51(1):31-38.
doi:10.5937/fme2301031V .

Vorkapić, Miloš, Živojinović, Danijela, Kreculj, Dragan, Ivanov, Toni, Baltić, Marija, Simonović, Aleksandar, "Application of Additive Technology and Reverse Engineering in the Realization of Damaged Obsolete Parts" in FME Transactions, 51, no. 1 (2023):31-38,
https://doi.org/10.5937/fme2301031V . .

TY  - JOUR
AU  - Vencl, Aleksandar
AU  - Svoboda, Petr
AU  - Klančnik, Simon
AU  - But, Adrian
AU  - Vorkapić, Miloš
AU  - Harničarova, Marta
AU  - Stojanović, Blaža
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5643
AB  - Three different and very small amounts of alumina (0.2, 0.3 and 0.5 wt. %) in two sizes
(approx. 25 and 100 nm) were used to enhance the wear characteristics of ZA-27 alloy-based nanocomposites.
Production was realised through mechanical alloying in pre-processing and compocasting
processes. Wear tests were under lubricated sliding conditions on a block-on-disc tribometer, at two
sliding speeds (0.25 and 1 m/s), two normal loads (40 and 100 N) and a sliding distance of 1000 m.
Experimental results were analysed by applying the response surface methodology (RSM) and a
suitable mathematical model for the wear rate of tested nanocomposites was developed. Appropriate
wear maps were constructed and the wear mechanism is discussed in this paper. The accuracy of the
prediction was evaluated with the use of an artificial neural network (ANN). The architecture of the
used ANN was 4-5-1 and the obtained overall regression coefficient was 0.98729. The comparison of
the predicting methods showed that ANN is more efficient in predicting wear.
PB  - Switzerland : Multidisciplinary Digital Publishing Institute (MDPI)
T2  - Lubricants
T1  - Influence of Al2O3 Nanoparticles Addition in ZA-27 Alloy-Based Nanocomposites and Soft Computing Prediction
VL  - 11
IS  - 1
SP  - 24
DO  - 10.3390/lubricants11010024
ER  - 

@article{
author = "Vencl, Aleksandar and Svoboda, Petr and Klančnik, Simon and But, Adrian and Vorkapić, Miloš and Harničarova, Marta and Stojanović, Blaža",
year = "2023",
abstract = "Three different and very small amounts of alumina (0.2, 0.3 and 0.5 wt. %) in two sizes
(approx. 25 and 100 nm) were used to enhance the wear characteristics of ZA-27 alloy-based nanocomposites.
Production was realised through mechanical alloying in pre-processing and compocasting
processes. Wear tests were under lubricated sliding conditions on a block-on-disc tribometer, at two
sliding speeds (0.25 and 1 m/s), two normal loads (40 and 100 N) and a sliding distance of 1000 m.
Experimental results were analysed by applying the response surface methodology (RSM) and a
suitable mathematical model for the wear rate of tested nanocomposites was developed. Appropriate
wear maps were constructed and the wear mechanism is discussed in this paper. The accuracy of the
prediction was evaluated with the use of an artificial neural network (ANN). The architecture of the
used ANN was 4-5-1 and the obtained overall regression coefficient was 0.98729. The comparison of
the predicting methods showed that ANN is more efficient in predicting wear.",
publisher = "Switzerland : Multidisciplinary Digital Publishing Institute (MDPI)",
journal = "Lubricants",
title = "Influence of Al2O3 Nanoparticles Addition in ZA-27 Alloy-Based Nanocomposites and Soft Computing Prediction",
volume = "11",
number = "1",
pages = "24",
doi = "10.3390/lubricants11010024"
}

Vencl, A., Svoboda, P., Klančnik, S., But, A., Vorkapić, M., Harničarova, M.,& Stojanović, B.. (2023). Influence of Al2O3 Nanoparticles Addition in ZA-27 Alloy-Based Nanocomposites and Soft Computing Prediction. in Lubricants
Switzerland : Multidisciplinary Digital Publishing Institute (MDPI)., 11(1), 24.
https://doi.org/10.3390/lubricants11010024

Vencl A, Svoboda P, Klančnik S, But A, Vorkapić M, Harničarova M, Stojanović B. Influence of Al2O3 Nanoparticles Addition in ZA-27 Alloy-Based Nanocomposites and Soft Computing Prediction. in Lubricants. 2023;11(1):24.
doi:10.3390/lubricants11010024 .

Vencl, Aleksandar, Svoboda, Petr, Klančnik, Simon, But, Adrian, Vorkapić, Miloš, Harničarova, Marta, Stojanović, Blaža, "Influence of Al2O3 Nanoparticles Addition in ZA-27 Alloy-Based Nanocomposites and Soft Computing Prediction" in Lubricants, 11, no. 1 (2023):24,
https://doi.org/10.3390/lubricants11010024 . .

TY  - CHAP
AU  - Vorkapić, Miloš
AU  - Ivanov, Toni
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5759
AB  - This paper investigates the implementation of additive manufacturing
(AM) in circular production (CP) through the 6R strategy. The methodology
allows designers to reconsider their decisions, correct mistakes or make specific
changes to the model in all phases of the design process, from initial drawings to
the finished product. CP enables the complete realisation of the model/prototype
with a particular focus on environmental protection and the additional use of
recycled waste. The proposed algorithm is tested through the design and manufacturing
of an enclosure of an industrial temperature transmitter. Some of the
weaknesses of additive manufacturing, such as mechanically damaged surfaces,
surface roughness, and tearing of models on weak joints, have been investigated,
and recommendations for mitigation are given.
The mechanical product finishing methods are described in detail in the paper
as well, and in order to check the prototype functionality, some tensile, thermal
stress and drop tests were performed, and the results were analysed and discussed.
It was shown that significant savings in time, cost and material can be achieved by
implementing AM in realising a fully functional prototype while simultaneously
in line with the demands for CP and 6R.
PB  - Springer
T2  - Experimental Research and Numerical Simulation in Applied Sciences. Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2022. Lecture Notes in Networks and Systems
T1  - Algorithm for Applying 3D Printing in Prototype Realization in Accordance with Circular Production and the 6R Strategy: Case - Enclosure for Industrial Temperature Transmitter
VL  - 564
SP  - 44
EP  - 78
DO  - 10.1007/978-3-031-19499-3_3
ER  - 

@inbook{
author = "Vorkapić, Miloš and Ivanov, Toni",
year = "2023",
abstract = "This paper investigates the implementation of additive manufacturing
(AM) in circular production (CP) through the 6R strategy. The methodology
allows designers to reconsider their decisions, correct mistakes or make specific
changes to the model in all phases of the design process, from initial drawings to
the finished product. CP enables the complete realisation of the model/prototype
with a particular focus on environmental protection and the additional use of
recycled waste. The proposed algorithm is tested through the design and manufacturing
of an enclosure of an industrial temperature transmitter. Some of the
weaknesses of additive manufacturing, such as mechanically damaged surfaces,
surface roughness, and tearing of models on weak joints, have been investigated,
and recommendations for mitigation are given.
The mechanical product finishing methods are described in detail in the paper
as well, and in order to check the prototype functionality, some tensile, thermal
stress and drop tests were performed, and the results were analysed and discussed.
It was shown that significant savings in time, cost and material can be achieved by
implementing AM in realising a fully functional prototype while simultaneously
in line with the demands for CP and 6R.",
publisher = "Springer",
journal = "Experimental Research and Numerical Simulation in Applied Sciences. Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2022. Lecture Notes in Networks and Systems",
booktitle = "Algorithm for Applying 3D Printing in Prototype Realization in Accordance with Circular Production and the 6R Strategy: Case - Enclosure for Industrial Temperature Transmitter",
volume = "564",
pages = "44-78",
doi = "10.1007/978-3-031-19499-3_3"
}

Vorkapić, M.,& Ivanov, T.. (2023). Algorithm for Applying 3D Printing in Prototype Realization in Accordance with Circular Production and the 6R Strategy: Case - Enclosure for Industrial Temperature Transmitter. in Experimental Research and Numerical Simulation in Applied Sciences. Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2022. Lecture Notes in Networks and Systems
Springer., 564, 44-78.
https://doi.org/10.1007/978-3-031-19499-3_3

Vorkapić M, Ivanov T. Algorithm for Applying 3D Printing in Prototype Realization in Accordance with Circular Production and the 6R Strategy: Case - Enclosure for Industrial Temperature Transmitter. in Experimental Research and Numerical Simulation in Applied Sciences. Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2022. Lecture Notes in Networks and Systems. 2023;564:44-78.
doi:10.1007/978-3-031-19499-3_3 .

Vorkapić, Miloš, Ivanov, Toni, "Algorithm for Applying 3D Printing in Prototype Realization in Accordance with Circular Production and the 6R Strategy: Case - Enclosure for Industrial Temperature Transmitter" in Experimental Research and Numerical Simulation in Applied Sciences. Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2022. Lecture Notes in Networks and Systems, 564 (2023):44-78,
https://doi.org/10.1007/978-3-031-19499-3_3 . .

TY  - JOUR
AU  - Zdolšek, Nikola
AU  - Janković, Bojan
AU  - Milović, Miloš
AU  - Brković, Snežana
AU  - Krstić, Jugoslav
AU  - Perović, Ivana
AU  - Vujković, Milica
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5541
AB  - The development of carbon materials with desirable textures and new aqueous electrolytes is the key strategy to improve the performance of supercapacitors. Herein, a deep eutectic solvent (DES) was used for in situ templating of a carbon material. A carbon material was characterized (XRD, N2-physisorption, FTIR, SEM and EDS) and used as an electrode material for the first time in multivalent-based supercapacitors. In situ templating of carbon was performed using a novel DES, which serves as a precursor for carbon and for in situ generation of MgO. The generation of MgO and its roles in templating of carbon were discussed. Templating of carbon with MgO lead to an increase in surface area and a microporous texture. The obtained carbon was tested in multivalent-ion (Al3+ and Mg2+) electrolytes and compared with H2SO4. The charge-storage mechanism was investigated and elaborated. The highest specific capacitance was obtained for the Al(NO3)3 electrolyte, while the operating voltage follows the order: Mg(NO3)2 > Al(NO3)3 > H2SO4. Electrical double-layer capacitance (versus pseudocapacitance) was dominant in all investigated electrolytes. The larger operating voltage in multivalent electrolytes is a consequence of the lower fraction of free water, which suppresses hydrogen evolution (when compared with H2SO4). The GCD was experimentally performed on the Al(NO3)3 electrolyte, which showed good cyclic stability, with an energy density of 22.3 Wh kg−1 at 65 W kg−1.
PB  - MDPI
T2  - Batteries
T1  - Deep Eutectic Solvent (DES) for In Situ Templating Carbon Material: Carbon Characterization and Application in Supercapacitors Containing Multivalent Ions
VL  - 8
IS  - 12
SP  - 284
DO  - 10.3390/batteries8120284
ER  - 

@article{
author = "Zdolšek, Nikola and Janković, Bojan and Milović, Miloš and Brković, Snežana and Krstić, Jugoslav and Perović, Ivana and Vujković, Milica",
year = "2022",
abstract = "The development of carbon materials with desirable textures and new aqueous electrolytes is the key strategy to improve the performance of supercapacitors. Herein, a deep eutectic solvent (DES) was used for in situ templating of a carbon material. A carbon material was characterized (XRD, N2-physisorption, FTIR, SEM and EDS) and used as an electrode material for the first time in multivalent-based supercapacitors. In situ templating of carbon was performed using a novel DES, which serves as a precursor for carbon and for in situ generation of MgO. The generation of MgO and its roles in templating of carbon were discussed. Templating of carbon with MgO lead to an increase in surface area and a microporous texture. The obtained carbon was tested in multivalent-ion (Al3+ and Mg2+) electrolytes and compared with H2SO4. The charge-storage mechanism was investigated and elaborated. The highest specific capacitance was obtained for the Al(NO3)3 electrolyte, while the operating voltage follows the order: Mg(NO3)2 > Al(NO3)3 > H2SO4. Electrical double-layer capacitance (versus pseudocapacitance) was dominant in all investigated electrolytes. The larger operating voltage in multivalent electrolytes is a consequence of the lower fraction of free water, which suppresses hydrogen evolution (when compared with H2SO4). The GCD was experimentally performed on the Al(NO3)3 electrolyte, which showed good cyclic stability, with an energy density of 22.3 Wh kg−1 at 65 W kg−1.",
publisher = "MDPI",
journal = "Batteries",
title = "Deep Eutectic Solvent (DES) for In Situ Templating Carbon Material: Carbon Characterization and Application in Supercapacitors Containing Multivalent Ions",
volume = "8",
number = "12",
pages = "284",
doi = "10.3390/batteries8120284"
}

Zdolšek, N., Janković, B., Milović, M., Brković, S., Krstić, J., Perović, I.,& Vujković, M.. (2022). Deep Eutectic Solvent (DES) for In Situ Templating Carbon Material: Carbon Characterization and Application in Supercapacitors Containing Multivalent Ions. in Batteries
MDPI., 8(12), 284.
https://doi.org/10.3390/batteries8120284

Zdolšek N, Janković B, Milović M, Brković S, Krstić J, Perović I, Vujković M. Deep Eutectic Solvent (DES) for In Situ Templating Carbon Material: Carbon Characterization and Application in Supercapacitors Containing Multivalent Ions. in Batteries. 2022;8(12):284.
doi:10.3390/batteries8120284 .

Zdolšek, Nikola, Janković, Bojan, Milović, Miloš, Brković, Snežana, Krstić, Jugoslav, Perović, Ivana, Vujković, Milica, "Deep Eutectic Solvent (DES) for In Situ Templating Carbon Material: Carbon Characterization and Application in Supercapacitors Containing Multivalent Ions" in Batteries, 8, no. 12 (2022):284,
https://doi.org/10.3390/batteries8120284 . .

TY  - JOUR
AU  - Vorkapić, Miloš
AU  - Mladenović, Ivana
AU  - Ivanov, Toni
AU  - Kovačević, Aleksandar
AU  - Mohammad Sakib, Hasan
AU  - Aleksandar, Simonović
AU  - Trajković, Isaak
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5363
AB  - Five series of specimens with two different print orientations (−45/45 and 0/90) and two print layer thicknesses (0.1 and 0.2 mm) were made. In total 60 specimens with 100% filament infill were made. One specimen series (20 pieces) was isolated as a reference or thermally untreated. Before the thermal treatment (annealing), two specimen moulding methods were used: NaCl powder (granulation 63 mm: 20 pieces) and Calcium Sulphate (Gypsum: 20 pieces). During the annealing, specimens immersed in NaCl powder were heated in a drying oven to the filament melting point (for PLA: 200°C, with a duration interval of 30 min), while the treatment of the heated specimens in gypsum was performed at a temperature of around 190°C, with duration interval of 3 h with the observed temperature inside the mould of about 100°C. An ultrasonic bath and a drying oven were used in the gypsum treatment. Temperature measurement and control during both annealing treatments were performed using a thermal imaging camera, while the temperature control inside the drying oven was performed using a digital thermometer. After treatment, the specimens in the moulds were cooled at room temperature, and the dimensions of annealing and untreated specimens were controlled. Surface morphology was characterised using scanning electron microscopy (SEM). The SEM analysis reveals improved internal structure after heat treatment of the PLA specimens. These results show that the investigated specimens after heat treatments had better structural properties than the referent specimens. Tensile testing on a universal testing machine in compliance with the ASTM D638 standard was also performed. The referent PLA specimen with −45/45 and layer thickness of 0.1 mm had the highest tensile stress value (64.08 MPa) while the specimen with minimal tensile stress value before fracture was 0/90, 0.2 mm (54.81 MPa). Heat treatment in gypsum showed the most significant increase in strength with −45/45 (0.1 mm) being the strongest (71.66 MPa) while the strongest specimen treated in sodium chloride was −45/45 (0.1 mm) with maximum tensile stress of 70.08 MPa. The mechanical characteristics of the PLA were characterised using the Vickers microhardness tester. The PLA microhardness value was calculated according to standards ASTM E384 and ISO 6507. The referent PLA specimen with −45/45 (0.2 mm) orientation shows the maximal microhardness value (125 MPa), and the minimal microhardness value was observed for the 0/90 (0.1 mm) orientation specimens (108 MPa). The heat treatment specimens in gypsum have a better hardness (185 MPa) than those treated in gypsum (165 MPa), with microhardness increasing by about 12%. The essence of the work is reflected in the additional filament processing to achieve a better structural and mechanical performance of the materials and reduce the anisotropy that is characteristic of 3D printing.
PB  - SAGE
T2  - Advances in Mechanical Engineering
T1  - Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds
VL  - 14
IS  - 8
SP  - 1
EP  - 15
DO  - 10.1177/16878132221120737
ER  - 

@article{
author = "Vorkapić, Miloš and Mladenović, Ivana and Ivanov, Toni and Kovačević, Aleksandar and Mohammad Sakib, Hasan and Aleksandar, Simonović and Trajković, Isaak",
year = "2022",
abstract = "Five series of specimens with two different print orientations (−45/45 and 0/90) and two print layer thicknesses (0.1 and 0.2 mm) were made. In total 60 specimens with 100% filament infill were made. One specimen series (20 pieces) was isolated as a reference or thermally untreated. Before the thermal treatment (annealing), two specimen moulding methods were used: NaCl powder (granulation 63 mm: 20 pieces) and Calcium Sulphate (Gypsum: 20 pieces). During the annealing, specimens immersed in NaCl powder were heated in a drying oven to the filament melting point (for PLA: 200°C, with a duration interval of 30 min), while the treatment of the heated specimens in gypsum was performed at a temperature of around 190°C, with duration interval of 3 h with the observed temperature inside the mould of about 100°C. An ultrasonic bath and a drying oven were used in the gypsum treatment. Temperature measurement and control during both annealing treatments were performed using a thermal imaging camera, while the temperature control inside the drying oven was performed using a digital thermometer. After treatment, the specimens in the moulds were cooled at room temperature, and the dimensions of annealing and untreated specimens were controlled. Surface morphology was characterised using scanning electron microscopy (SEM). The SEM analysis reveals improved internal structure after heat treatment of the PLA specimens. These results show that the investigated specimens after heat treatments had better structural properties than the referent specimens. Tensile testing on a universal testing machine in compliance with the ASTM D638 standard was also performed. The referent PLA specimen with −45/45 and layer thickness of 0.1 mm had the highest tensile stress value (64.08 MPa) while the specimen with minimal tensile stress value before fracture was 0/90, 0.2 mm (54.81 MPa). Heat treatment in gypsum showed the most significant increase in strength with −45/45 (0.1 mm) being the strongest (71.66 MPa) while the strongest specimen treated in sodium chloride was −45/45 (0.1 mm) with maximum tensile stress of 70.08 MPa. The mechanical characteristics of the PLA were characterised using the Vickers microhardness tester. The PLA microhardness value was calculated according to standards ASTM E384 and ISO 6507. The referent PLA specimen with −45/45 (0.2 mm) orientation shows the maximal microhardness value (125 MPa), and the minimal microhardness value was observed for the 0/90 (0.1 mm) orientation specimens (108 MPa). The heat treatment specimens in gypsum have a better hardness (185 MPa) than those treated in gypsum (165 MPa), with microhardness increasing by about 12%. The essence of the work is reflected in the additional filament processing to achieve a better structural and mechanical performance of the materials and reduce the anisotropy that is characteristic of 3D printing.",
publisher = "SAGE",
journal = "Advances in Mechanical Engineering",
title = "Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds",
volume = "14",
number = "8",
pages = "1-15",
doi = "10.1177/16878132221120737"
}

Vorkapić, M., Mladenović, I., Ivanov, T., Kovačević, A., Mohammad Sakib, H., Aleksandar, S.,& Trajković, I.. (2022). Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds. in Advances in Mechanical Engineering
SAGE., 14(8), 1-15.
https://doi.org/10.1177/16878132221120737

Vorkapić M, Mladenović I, Ivanov T, Kovačević A, Mohammad Sakib H, Aleksandar S, Trajković I. Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds. in Advances in Mechanical Engineering. 2022;14(8):1-15.
doi:10.1177/16878132221120737 .

Vorkapić, Miloš, Mladenović, Ivana, Ivanov, Toni, Kovačević, Aleksandar, Mohammad Sakib, Hasan, Aleksandar, Simonović, Trajković, Isaak, "Enhancing mechanical properties of 3D printed thermoplastic polymers by annealing in moulds" in Advances in Mechanical Engineering, 14, no. 8 (2022):1-15,
https://doi.org/10.1177/16878132221120737 . .

TY  - JOUR
AU  - Vorkapić, Miloš
AU  - Mladenović, Ivana
AU  - Pergal, Marija
AU  - Ivanov, Toni
AU  - Baltić, Marija
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5379
AB  - Three-dimensional printed plastic products developed through fused deposition
modelling (FDM) take long-term mechanical loading in most industrial prototypes.
This article focuses on the impact of the 3D printing parameters, type of thermal
treatment and variation of characteristic dimensions of standard specimens on the
tensile properties of poly(lactic acid) (PLA) material. Two mediums were used for
thermal treatment: NaCl powder and plaster. The specimens immersed in NaCl
powder were heated to the melting temperature of the filament (200 °C), while
the processing of the plastered specimens was performed at a temperature of
100 °C. After treatment, the specimens were cooled at room temperature (25 °C),
and the dimensions of the annealed and untreated specimens were controlled.
The tensile test of the specimens was performed on the universal test machine.
The response surface methodology (RSM) is employed to predict the tensile stress
by undertaking input parameters. The analysis of variance (ANOVA) results
revealed that the untreated specimens, orientation – 45/45 and layer thickness of
0.1 mm had the highest tensile stress value. Thermal treatment in plaster showed
a significant increase in tensile strength, while the best specimens were obtained
after treatment in NaCl, and all refer to the –45/45 (0.1 mm) orientation.
PB  - Belgrade, Serbia : Balkan Scientific Centre
T2  - Tribology and Materials
T1  - Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology
VL  - 1
IS  - 2
SP  - 70
EP  - 80
DO  - 10.46793/tribomat.2022.009
ER  - 

@article{
author = "Vorkapić, Miloš and Mladenović, Ivana and Pergal, Marija and Ivanov, Toni and Baltić, Marija",
year = "2022",
abstract = "Three-dimensional printed plastic products developed through fused deposition
modelling (FDM) take long-term mechanical loading in most industrial prototypes.
This article focuses on the impact of the 3D printing parameters, type of thermal
treatment and variation of characteristic dimensions of standard specimens on the
tensile properties of poly(lactic acid) (PLA) material. Two mediums were used for
thermal treatment: NaCl powder and plaster. The specimens immersed in NaCl
powder were heated to the melting temperature of the filament (200 °C), while
the processing of the plastered specimens was performed at a temperature of
100 °C. After treatment, the specimens were cooled at room temperature (25 °C),
and the dimensions of the annealed and untreated specimens were controlled.
The tensile test of the specimens was performed on the universal test machine.
The response surface methodology (RSM) is employed to predict the tensile stress
by undertaking input parameters. The analysis of variance (ANOVA) results
revealed that the untreated specimens, orientation – 45/45 and layer thickness of
0.1 mm had the highest tensile stress value. Thermal treatment in plaster showed
a significant increase in tensile strength, while the best specimens were obtained
after treatment in NaCl, and all refer to the –45/45 (0.1 mm) orientation.",
publisher = "Belgrade, Serbia : Balkan Scientific Centre",
journal = "Tribology and Materials",
title = "Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology",
volume = "1",
number = "2",
pages = "70-80",
doi = "10.46793/tribomat.2022.009"
}

Vorkapić, M., Mladenović, I., Pergal, M., Ivanov, T.,& Baltić, M.. (2022). Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology. in Tribology and Materials
Belgrade, Serbia : Balkan Scientific Centre., 1(2), 70-80.
https://doi.org/10.46793/tribomat.2022.009

Vorkapić M, Mladenović I, Pergal M, Ivanov T, Baltić M. Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology. in Tribology and Materials. 2022;1(2):70-80.
doi:10.46793/tribomat.2022.009 .

Vorkapić, Miloš, Mladenović, Ivana, Pergal, Marija, Ivanov, Toni, Baltić, Marija, "Optimisation of tensile stress of poly(lactic acid) 3D printed materials using response surface methodology" in Tribology and Materials, 1, no. 2 (2022):70-80,
https://doi.org/10.46793/tribomat.2022.009 . .

TY  - CONF
AU  - Baltić, Marija
AU  - Vorkapić, Miloš
AU  - Simonović, Aleksandar
AU  - Knežević, Aleksandar
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5677
AB  - Composite materials are a combination of two or more materials at the macroscopic level. They have better characteristics than individual components. By combining different types of mountings and matrices, new advanced materials can be obtained to improve performance. In complement to standard structures (carbon-epoxy, glass-epoxy), increasing importance is given to biodegradable materials. Most often, materials with a vegetative part of fungi (mycelium-mesh structure of hyphae) are used, which are increasingly used to realise biocomposites with unique processing technology. These composites have relatively good mechanical properties and are environmentally friendly because they are biodegradable. Today, biocomposites are used in packaging production, fashion, and construction, and the emphasis is on the food industry. This paper presents the making mould technology to set the biocomposite structure and test their mechanical characteristics. The mould for pressing biomaterial connected with mycelium is made of two parts. The primary purpose of the mould is to bring the loose natural material into a solid preparation following the standards ASTM D7250 and ASTM C393, which include testing the technologically prepared and hardened sample for bending and shearing. The testing included two phases. In the first, hardened samples without moisture were tested. The second involved the technological process of drying after sowing mycelium so that a variant of the mould with a perforated bottom was used to harden the samples thoroughly. A comparative analysis of the results in both phases was performed, which was a further guideline in examining the improvement of composite characteristics.
PB  - Belgrade : Innovation Center of Faculty of Mechanical Engineering
C3  - Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia
T1  - Mould technology to test mechanical characreristics of biocomposite structures
SP  - 62
EP  - 62
UR  - https://hdl.handle.net/21.15107/rcub_cer_5677
ER  - 

@conference{
author = "Baltić, Marija and Vorkapić, Miloš and Simonović, Aleksandar and Knežević, Aleksandar",
year = "2022",
abstract = "Composite materials are a combination of two or more materials at the macroscopic level. They have better characteristics than individual components. By combining different types of mountings and matrices, new advanced materials can be obtained to improve performance. In complement to standard structures (carbon-epoxy, glass-epoxy), increasing importance is given to biodegradable materials. Most often, materials with a vegetative part of fungi (mycelium-mesh structure of hyphae) are used, which are increasingly used to realise biocomposites with unique processing technology. These composites have relatively good mechanical properties and are environmentally friendly because they are biodegradable. Today, biocomposites are used in packaging production, fashion, and construction, and the emphasis is on the food industry. This paper presents the making mould technology to set the biocomposite structure and test their mechanical characteristics. The mould for pressing biomaterial connected with mycelium is made of two parts. The primary purpose of the mould is to bring the loose natural material into a solid preparation following the standards ASTM D7250 and ASTM C393, which include testing the technologically prepared and hardened sample for bending and shearing. The testing included two phases. In the first, hardened samples without moisture were tested. The second involved the technological process of drying after sowing mycelium so that a variant of the mould with a perforated bottom was used to harden the samples thoroughly. A comparative analysis of the results in both phases was performed, which was a further guideline in examining the improvement of composite characteristics.",
publisher = "Belgrade : Innovation Center of Faculty of Mechanical Engineering",
journal = "Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia",
title = "Mould technology to test mechanical characreristics of biocomposite structures",
pages = "62-62",
url = "https://hdl.handle.net/21.15107/rcub_cer_5677"
}

Baltić, M., Vorkapić, M., Simonović, A.,& Knežević, A.. (2022). Mould technology to test mechanical characreristics of biocomposite structures. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia
Belgrade : Innovation Center of Faculty of Mechanical Engineering., 62-62.
https://hdl.handle.net/21.15107/rcub_cer_5677

Baltić M, Vorkapić M, Simonović A, Knežević A. Mould technology to test mechanical characreristics of biocomposite structures. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia. 2022;:62-62.
https://hdl.handle.net/21.15107/rcub_cer_5677 .

Baltić, Marija, Vorkapić, Miloš, Simonović, Aleksandar, Knežević, Aleksandar, "Mould technology to test mechanical characreristics of biocomposite structures" in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia (2022):62-62,
https://hdl.handle.net/21.15107/rcub_cer_5677 .

TY  - CONF
AU  - Vorkapić, Miloš
AU  - Baltić, Marija
AU  - Ivanov, Toni
AU  - Simonović, Aleksandar
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5676
AB  - This paper presents the 3D printing technology for various textile materials. The application of this technology is vital in manufacturing various clothing items, primarily for specific purposes: hikers, firefighters, soldiers, and athletes. The installation of sensors, life function parameters monitoring and the usage of the new materials are the basis for the future development of the textile industry. Today, thermoplastic and textile materials are increasingly used in practice. Polylactic Acid (PLA) thermoplastic materials were used in the paper - in spool, Polyvinyl Chloride (PVC) and Nylon (in strips); while from textile materials, polyester, viscose and silk in the form of finished fabrics were considered. The technology of preparation of textile fibres for 3D printing using laser is shown. This technology makes it easier to combine textiles and molten filament. The pros and cons of joining different materials are discussed. Further research would go in the direction of making constructive solutions and testing the mechanical properties of various textile-polymer composites.
PB  - Belgrade : Innovation Center of Faculty of Mechanical Engineering
C3  - Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia
T1  - The significance of 3D printing in textile-polymer composite structures realization for special purpose
SP  - 66
EP  - 66
UR  - https://hdl.handle.net/21.15107/rcub_cer_5676
ER  - 

@conference{
author = "Vorkapić, Miloš and Baltić, Marija and Ivanov, Toni and Simonović, Aleksandar",
year = "2022",
abstract = "This paper presents the 3D printing technology for various textile materials. The application of this technology is vital in manufacturing various clothing items, primarily for specific purposes: hikers, firefighters, soldiers, and athletes. The installation of sensors, life function parameters monitoring and the usage of the new materials are the basis for the future development of the textile industry. Today, thermoplastic and textile materials are increasingly used in practice. Polylactic Acid (PLA) thermoplastic materials were used in the paper - in spool, Polyvinyl Chloride (PVC) and Nylon (in strips); while from textile materials, polyester, viscose and silk in the form of finished fabrics were considered. The technology of preparation of textile fibres for 3D printing using laser is shown. This technology makes it easier to combine textiles and molten filament. The pros and cons of joining different materials are discussed. Further research would go in the direction of making constructive solutions and testing the mechanical properties of various textile-polymer composites.",
publisher = "Belgrade : Innovation Center of Faculty of Mechanical Engineering",
journal = "Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia",
title = "The significance of 3D printing in textile-polymer composite structures realization for special purpose",
pages = "66-66",
url = "https://hdl.handle.net/21.15107/rcub_cer_5676"
}

Vorkapić, M., Baltić, M., Ivanov, T.,& Simonović, A.. (2022). The significance of 3D printing in textile-polymer composite structures realization for special purpose. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia
Belgrade : Innovation Center of Faculty of Mechanical Engineering., 66-66.
https://hdl.handle.net/21.15107/rcub_cer_5676

Vorkapić M, Baltić M, Ivanov T, Simonović A. The significance of 3D printing in textile-polymer composite structures realization for special purpose. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia. 2022;:66-66.
https://hdl.handle.net/21.15107/rcub_cer_5676 .

Vorkapić, Miloš, Baltić, Marija, Ivanov, Toni, Simonović, Aleksandar, "The significance of 3D printing in textile-polymer composite structures realization for special purpose" in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia (2022):66-66,
https://hdl.handle.net/21.15107/rcub_cer_5676 .

TY  - CONF
AU  - Tanović, Dragoljub
AU  - Svorcan, Jelena
AU  - Ivanović, Milica
AU  - Vorkapić, Miloš
AU  - Telebak, K
AU  - Stojanović, J
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5678
AB  - The wind speed is one of the major parameter influencing the design of the wind turbine, which varies widely over the different part of the country and globe. So, significant research is going on for the design of wind turbine for low, medium and high wind speed. Currently, many researchers have started designing small-scale horizontal axis wind turbines (HAWT) in world, to adapt their use to households. The advantage is reflected in the simple and affordable construction, uninterrupted operation and satisfactory power that wind turbines create. An airfoil is defined as the cross section of a body that is placed in an airstream in order to produce a useful aerodynamic force in the most efficient manner possible. The cross sections of wings, propeller blades, windmill blades, compressor and turbine blades in a jet engine, and hydrofoils are example of airfoils. A computational study has been conducted on various airfoils to simulate flows at different Reynolds numbers (Re) and wind speed to provide understanding and guidance for other low Reynolds-number designs. The numerical computational method used in this study is a boundary element method (BEM) which is implemented in software Qblade. It is an alternative deterministic method which incorporates a mesh that is only located on the boundaries of the domain and hence are attractive for free surface problems. The airfoils investigated in this study include NACA 4412, NACA 63-415 and S809. Performances such as power, power coefficient and tip speed ratio were compared.
PB  - Belgrade : Innovation Center of Faculty of Mechanical Engineering
C3  - Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia
T1  - The influence of the Reynolds number on the airfoils
SP  - 63
EP  - 63
UR  - https://hdl.handle.net/21.15107/rcub_cer_5678
ER  - 

@conference{
author = "Tanović, Dragoljub and Svorcan, Jelena and Ivanović, Milica and Vorkapić, Miloš and Telebak, K and Stojanović, J",
year = "2022",
abstract = "The wind speed is one of the major parameter influencing the design of the wind turbine, which varies widely over the different part of the country and globe. So, significant research is going on for the design of wind turbine for low, medium and high wind speed. Currently, many researchers have started designing small-scale horizontal axis wind turbines (HAWT) in world, to adapt their use to households. The advantage is reflected in the simple and affordable construction, uninterrupted operation and satisfactory power that wind turbines create. An airfoil is defined as the cross section of a body that is placed in an airstream in order to produce a useful aerodynamic force in the most efficient manner possible. The cross sections of wings, propeller blades, windmill blades, compressor and turbine blades in a jet engine, and hydrofoils are example of airfoils. A computational study has been conducted on various airfoils to simulate flows at different Reynolds numbers (Re) and wind speed to provide understanding and guidance for other low Reynolds-number designs. The numerical computational method used in this study is a boundary element method (BEM) which is implemented in software Qblade. It is an alternative deterministic method which incorporates a mesh that is only located on the boundaries of the domain and hence are attractive for free surface problems. The airfoils investigated in this study include NACA 4412, NACA 63-415 and S809. Performances such as power, power coefficient and tip speed ratio were compared.",
publisher = "Belgrade : Innovation Center of Faculty of Mechanical Engineering",
journal = "Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia",
title = "The influence of the Reynolds number on the airfoils",
pages = "63-63",
url = "https://hdl.handle.net/21.15107/rcub_cer_5678"
}

Tanović, D., Svorcan, J., Ivanović, M., Vorkapić, M., Telebak, K.,& Stojanović, J.. (2022). The influence of the Reynolds number on the airfoils. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia
Belgrade : Innovation Center of Faculty of Mechanical Engineering., 63-63.
https://hdl.handle.net/21.15107/rcub_cer_5678

Tanović D, Svorcan J, Ivanović M, Vorkapić M, Telebak K, Stojanović J. The influence of the Reynolds number on the airfoils. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia. 2022;:63-63.
https://hdl.handle.net/21.15107/rcub_cer_5678 .

Tanović, Dragoljub, Svorcan, Jelena, Ivanović, Milica, Vorkapić, Miloš, Telebak, K, Stojanović, J, "The influence of the Reynolds number on the airfoils" in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2022, 05 – 08 July 2022, Zlatibor, Serbia (2022):63-63,
https://hdl.handle.net/21.15107/rcub_cer_5678 .

TY  - CONF
AU  - Vorkapić, Miloš
AU  - Mladenović, Ivana
AU  - Kovačević, Aleksandar
AU  - Baltić, Marija
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5662
AB  - Reverse engineering (RE) is a process that integrates additive technologies, while enabling finishing or modifications of an existing model, as well as the application of new ideas in design improvement. This approach leads to the reduction (or elimination) of certain steps of the product development process, and faster model digitization, with further improvements and optimization of parameters. The biggest challenge in the application of RE is the high-quality physical part reproduction with the best possible characteristics, while keeping the realization costs as low as possible. Especially in this segment additive technologies become increasingly important. In this work, RE is applied in order to fabricate a protective cover of a machine used in semiconductor production, based on the existing (damaged) physical sample. The protective cover is a part of a silicon wafer dicing saw (Micro Automation, Model 602M), and it is made of plastic. Due to the age and the long exploitation of the machine, the sample part was broken at one of its supports. Unfortunately, since the machine has become obsolete a long time ago, the spare parts cannot be found. In such cases, RE has an important role, and the fabrication of a new part would be almost unthinkable without the application of additive technology. The CAD model of the protective cover was defined based on the measured dimensions of the damaged part. The procedure is very convenient in cases when only a physical part (or a finished product) exists without technical documentation, or when the existing technical documentation is not in a digital form. We performed model optimization and load simulation on the supports for different materials. After digitization, the model manufacturing process started. The model was made of the thermoplastic polymer ABS on the 3D printer Wanhao Duplicator, type i3 plus, made in the People’s Republic of China. In this paper, we intended to illustrate the significance of the symbiosis of RE and the additive technology in the process of realization of parts/assemblies of an obsolete product with no spare parts available.
PB  - SIRAMM project - H2020-WIDESPREAD-2018-03 Project No. 857124, Horizon 2020
C3  - Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia
T1  - Link between reverse engineering and additive technology on the example of a model without technical documentation
SP  - 39
EP  - 39
UR  - https://hdl.handle.net/21.15107/rcub_cer_5662
ER  - 

@conference{
author = "Vorkapić, Miloš and Mladenović, Ivana and Kovačević, Aleksandar and Baltić, Marija",
year = "2021",
abstract = "Reverse engineering (RE) is a process that integrates additive technologies, while enabling finishing or modifications of an existing model, as well as the application of new ideas in design improvement. This approach leads to the reduction (or elimination) of certain steps of the product development process, and faster model digitization, with further improvements and optimization of parameters. The biggest challenge in the application of RE is the high-quality physical part reproduction with the best possible characteristics, while keeping the realization costs as low as possible. Especially in this segment additive technologies become increasingly important. In this work, RE is applied in order to fabricate a protective cover of a machine used in semiconductor production, based on the existing (damaged) physical sample. The protective cover is a part of a silicon wafer dicing saw (Micro Automation, Model 602M), and it is made of plastic. Due to the age and the long exploitation of the machine, the sample part was broken at one of its supports. Unfortunately, since the machine has become obsolete a long time ago, the spare parts cannot be found. In such cases, RE has an important role, and the fabrication of a new part would be almost unthinkable without the application of additive technology. The CAD model of the protective cover was defined based on the measured dimensions of the damaged part. The procedure is very convenient in cases when only a physical part (or a finished product) exists without technical documentation, or when the existing technical documentation is not in a digital form. We performed model optimization and load simulation on the supports for different materials. After digitization, the model manufacturing process started. The model was made of the thermoplastic polymer ABS on the 3D printer Wanhao Duplicator, type i3 plus, made in the People’s Republic of China. In this paper, we intended to illustrate the significance of the symbiosis of RE and the additive technology in the process of realization of parts/assemblies of an obsolete product with no spare parts available.",
publisher = "SIRAMM project - H2020-WIDESPREAD-2018-03 Project No. 857124, Horizon 2020",
journal = "Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia",
title = "Link between reverse engineering and additive technology on the example of a model without technical documentation",
pages = "39-39",
url = "https://hdl.handle.net/21.15107/rcub_cer_5662"
}

Vorkapić, M., Mladenović, I., Kovačević, A.,& Baltić, M.. (2021). Link between reverse engineering and additive technology on the example of a model without technical documentation. in Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia
SIRAMM project - H2020-WIDESPREAD-2018-03 Project No. 857124, Horizon 2020., 39-39.
https://hdl.handle.net/21.15107/rcub_cer_5662

Vorkapić M, Mladenović I, Kovačević A, Baltić M. Link between reverse engineering and additive technology on the example of a model without technical documentation. in Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia. 2021;:39-39.
https://hdl.handle.net/21.15107/rcub_cer_5662 .

Vorkapić, Miloš, Mladenović, Ivana, Kovačević, Aleksandar, Baltić, Marija, "Link between reverse engineering and additive technology on the example of a model without technical documentation" in Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia (2021):39-39,
https://hdl.handle.net/21.15107/rcub_cer_5662 .

TY  - CONF
AU  - Mladenović, Ivana
AU  - Baltić, Marija
AU  - Vorkapić, Miloš
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5660
AB  - In this study, electrodeposition of nano-crystalline copper coatings (ED-Cu) from the sulphate bath on different substrate by the regime of direct current (DC) has been investigated. Composite systems of copper thin coatings (5-20 µm) on metal foil of copper, brass and stainless steel were fabricated. Electrodeposition was performed at constant current density (50 mA•cm-2) in the open type electrochemical cell with application magnetic stirrer (100 rpm) in order to mixing electrolyte. Adhesion of coatings on different substrates was investigated by Vickers microindentation hardness testing in order to determinate relation between microhardness of the coatings and adhesion strength of the coatings to the substrates. The observed adhesion parameter is called the critical reduction depth. In order to evaluate the results of adhesion obtained by Vickers method, bidirectional bending test technique was performed to assess the adhesion behaviour of ED-Cu coatings to the substrates. Bidirectional bending test machine was specially designed for this study. The mechanism performs bending of the sample under controlled and automated conditions. The critical cycle number (start of detachment of the coating from the foil) is observed. Then, the values of adhesion parameters obtained by applying two different measurement methods were compared. A comparative investigation showed that the ED-Cu coatings produced on brass substrate had much better adhesion then the same coating on steel, but weaker adhesion than Cu on Cu foil. It has also been confirmed that with increasing thickness of the copper coatings, adhesion decreases.
PB  - Belgrade : Innovation Center of Faculty of Mechanical Engineering
C3  - Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia
T1  - Characterization and analysis adhesion of copper coating electrodeposited on flexibile substrates
SP  - 62
EP  - 62
UR  - https://hdl.handle.net/21.15107/rcub_cer_5660
ER  - 

@conference{
author = "Mladenović, Ivana and Baltić, Marija and Vorkapić, Miloš",
year = "2021",
abstract = "In this study, electrodeposition of nano-crystalline copper coatings (ED-Cu) from the sulphate bath on different substrate by the regime of direct current (DC) has been investigated. Composite systems of copper thin coatings (5-20 µm) on metal foil of copper, brass and stainless steel were fabricated. Electrodeposition was performed at constant current density (50 mA•cm-2) in the open type electrochemical cell with application magnetic stirrer (100 rpm) in order to mixing electrolyte. Adhesion of coatings on different substrates was investigated by Vickers microindentation hardness testing in order to determinate relation between microhardness of the coatings and adhesion strength of the coatings to the substrates. The observed adhesion parameter is called the critical reduction depth. In order to evaluate the results of adhesion obtained by Vickers method, bidirectional bending test technique was performed to assess the adhesion behaviour of ED-Cu coatings to the substrates. Bidirectional bending test machine was specially designed for this study. The mechanism performs bending of the sample under controlled and automated conditions. The critical cycle number (start of detachment of the coating from the foil) is observed. Then, the values of adhesion parameters obtained by applying two different measurement methods were compared. A comparative investigation showed that the ED-Cu coatings produced on brass substrate had much better adhesion then the same coating on steel, but weaker adhesion than Cu on Cu foil. It has also been confirmed that with increasing thickness of the copper coatings, adhesion decreases.",
publisher = "Belgrade : Innovation Center of Faculty of Mechanical Engineering",
journal = "Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia",
title = "Characterization and analysis adhesion of copper coating electrodeposited on flexibile substrates",
pages = "62-62",
url = "https://hdl.handle.net/21.15107/rcub_cer_5660"
}

Mladenović, I., Baltić, M.,& Vorkapić, M.. (2021). Characterization and analysis adhesion of copper coating electrodeposited on flexibile substrates. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia
Belgrade : Innovation Center of Faculty of Mechanical Engineering., 62-62.
https://hdl.handle.net/21.15107/rcub_cer_5660

Mladenović I, Baltić M, Vorkapić M. Characterization and analysis adhesion of copper coating electrodeposited on flexibile substrates. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia. 2021;:62-62.
https://hdl.handle.net/21.15107/rcub_cer_5660 .

Mladenović, Ivana, Baltić, Marija, Vorkapić, Miloš, "Characterization and analysis adhesion of copper coating electrodeposited on flexibile substrates" in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia (2021):62-62,
https://hdl.handle.net/21.15107/rcub_cer_5660 .

TY  - CONF
AU  - Baltić, Marija
AU  - Ivanov, Toni
AU  - Vorkapić, Miloš
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5658
AB  - The proper functioning of urban public transport is imperative in larger city areas. Thus the bus is still the most commonly used type of passenger transport. Taking into account the daily frequency of these vehicles, the emission and impact of harmful substances on the environment are very important. One of the most important factors when inspecting a vehicle is checking the emission of exhaust gases, which is a significant indicator of the regularity of the power group. If the emission is above the permitted limits, it is important to prevent further bus exploitation. Because of the aforementioned problems the advantage is given to electric vehicles, and as a representative of the propulsion, electric batteries with LTO (lithium titanium) capacity of 90.5 kWh that can be charched fast at the terminals are considered.
This paper analyses one city line where a comparison of technical features, energy efficiency and environmental effects between the existing diesel and new electric buses was made. Based on the set models, appropriate load simulations, and the obtained results, it was established that 12 electric buses replace 9 articulated buses according to the frequency of passenger transport.
In terms of energy efficiency, two modes of electric buses operation were analysed: the first without air conditioning and heating system, and the second at a temperature of -10 °C. Based on detailed research, it is recommended to introduce electric buses in public transportation, both in terms of cost-effectiveness and in environmental protection.
PB  - Belgrade : Innovation Center of Faculty of Mechanical Engineering
C3  - Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021,  29/06-02/07 2021, Zlatibor, Serbia
T1  - Comparative analysis of conventional diesel and electric bus characteristics – Technical and environmental aspects
SP  - 61
EP  - 61
UR  - https://hdl.handle.net/21.15107/rcub_cer_5658
ER  - 

@conference{
author = "Baltić, Marija and Ivanov, Toni and Vorkapić, Miloš",
year = "2021",
abstract = "The proper functioning of urban public transport is imperative in larger city areas. Thus the bus is still the most commonly used type of passenger transport. Taking into account the daily frequency of these vehicles, the emission and impact of harmful substances on the environment are very important. One of the most important factors when inspecting a vehicle is checking the emission of exhaust gases, which is a significant indicator of the regularity of the power group. If the emission is above the permitted limits, it is important to prevent further bus exploitation. Because of the aforementioned problems the advantage is given to electric vehicles, and as a representative of the propulsion, electric batteries with LTO (lithium titanium) capacity of 90.5 kWh that can be charched fast at the terminals are considered.
This paper analyses one city line where a comparison of technical features, energy efficiency and environmental effects between the existing diesel and new electric buses was made. Based on the set models, appropriate load simulations, and the obtained results, it was established that 12 electric buses replace 9 articulated buses according to the frequency of passenger transport.
In terms of energy efficiency, two modes of electric buses operation were analysed: the first without air conditioning and heating system, and the second at a temperature of -10 °C. Based on detailed research, it is recommended to introduce electric buses in public transportation, both in terms of cost-effectiveness and in environmental protection.",
publisher = "Belgrade : Innovation Center of Faculty of Mechanical Engineering",
journal = "Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021,  29/06-02/07 2021, Zlatibor, Serbia",
title = "Comparative analysis of conventional diesel and electric bus characteristics – Technical and environmental aspects",
pages = "61-61",
url = "https://hdl.handle.net/21.15107/rcub_cer_5658"
}

Baltić, M., Ivanov, T.,& Vorkapić, M.. (2021). Comparative analysis of conventional diesel and electric bus characteristics – Technical and environmental aspects. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021,  29/06-02/07 2021, Zlatibor, Serbia
Belgrade : Innovation Center of Faculty of Mechanical Engineering., 61-61.
https://hdl.handle.net/21.15107/rcub_cer_5658

Baltić M, Ivanov T, Vorkapić M. Comparative analysis of conventional diesel and electric bus characteristics – Technical and environmental aspects. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021,  29/06-02/07 2021, Zlatibor, Serbia. 2021;:61-61.
https://hdl.handle.net/21.15107/rcub_cer_5658 .

Baltić, Marija, Ivanov, Toni, Vorkapić, Miloš, "Comparative analysis of conventional diesel and electric bus characteristics – Technical and environmental aspects" in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021,  29/06-02/07 2021, Zlatibor, Serbia (2021):61-61,
https://hdl.handle.net/21.15107/rcub_cer_5658 .

TY  - CONF
AU  - Hasan, Mohammad Sakib
AU  - Ivanov, Toni
AU  - Vorkapić, Miloš
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5659
AB  - In this paper, bone-shaped samples (dogbone) made of thermoplastic polymer PLA were tested according to the ASTM D638 standard. All samples were made on a WANHAO duplicator i3 plus 3D printer. PLA is the most widely used polymer mainly due to its thermoplastic workability and good mechanical properties. The mechanical characteristics of the materials were compared after the realization of the samples on the 3D printer and after the remelting process. All samples were built in horizontal orientation. Remelting process involves stacking / packing samples in a mold and pressing them with sodium chloride (NaCl) powder. Since sodium chloride (NaCl) is a poor conductor of temperature, it takes some time for the experiment to be realized in order to equalize the temperatures throughout the volume of the mold. The mold thus formed was kept at 210°C for 30-45 minutes. The purpose of salt powder molding is to get even curing without deformation on the surfaces of the parts. The samples become rougher after this treatment and it is necessary to remove excess salt from the structure as well as additional surface treatment. The remelting process proved to be very cheap, but also quite unreliable due to the slow and uneven rise in temperature in the mold. The SHIMADZU AGS-X 100 kN tensile testing machine was used to test the tensile strength of the samples. During the experiment, it was found that the samples with remelting process have a much higher tensile strength compared to the untreated samples. Remelting procedure of PLA greatly improves the mechanical properties and gives better performance to complex parts printed on a 3D printer by reducing the anisotropic characteristics of the polymer. Further research would be related to the testing of other thermoplastic materials such as ABS, PET-G etc. It would be interesting to use other materials for molding and to perform a comparative analysis of the obtained results of the new molding methods with the described method of applying salt powder.
PB  - Belgrade : Innovation Center of Faculty of Mechanical Engineering
C3  - Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia
T1  - Improvement of mechanical characteristics of PLA by applying remelting process
SP  - 66
EP  - 66
UR  - https://hdl.handle.net/21.15107/rcub_cer_5659
ER  - 

@conference{
author = "Hasan, Mohammad Sakib and Ivanov, Toni and Vorkapić, Miloš",
year = "2021",
abstract = "In this paper, bone-shaped samples (dogbone) made of thermoplastic polymer PLA were tested according to the ASTM D638 standard. All samples were made on a WANHAO duplicator i3 plus 3D printer. PLA is the most widely used polymer mainly due to its thermoplastic workability and good mechanical properties. The mechanical characteristics of the materials were compared after the realization of the samples on the 3D printer and after the remelting process. All samples were built in horizontal orientation. Remelting process involves stacking / packing samples in a mold and pressing them with sodium chloride (NaCl) powder. Since sodium chloride (NaCl) is a poor conductor of temperature, it takes some time for the experiment to be realized in order to equalize the temperatures throughout the volume of the mold. The mold thus formed was kept at 210°C for 30-45 minutes. The purpose of salt powder molding is to get even curing without deformation on the surfaces of the parts. The samples become rougher after this treatment and it is necessary to remove excess salt from the structure as well as additional surface treatment. The remelting process proved to be very cheap, but also quite unreliable due to the slow and uneven rise in temperature in the mold. The SHIMADZU AGS-X 100 kN tensile testing machine was used to test the tensile strength of the samples. During the experiment, it was found that the samples with remelting process have a much higher tensile strength compared to the untreated samples. Remelting procedure of PLA greatly improves the mechanical properties and gives better performance to complex parts printed on a 3D printer by reducing the anisotropic characteristics of the polymer. Further research would be related to the testing of other thermoplastic materials such as ABS, PET-G etc. It would be interesting to use other materials for molding and to perform a comparative analysis of the obtained results of the new molding methods with the described method of applying salt powder.",
publisher = "Belgrade : Innovation Center of Faculty of Mechanical Engineering",
journal = "Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia",
title = "Improvement of mechanical characteristics of PLA by applying remelting process",
pages = "66-66",
url = "https://hdl.handle.net/21.15107/rcub_cer_5659"
}

Hasan, M. S., Ivanov, T.,& Vorkapić, M.. (2021). Improvement of mechanical characteristics of PLA by applying remelting process. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia
Belgrade : Innovation Center of Faculty of Mechanical Engineering., 66-66.
https://hdl.handle.net/21.15107/rcub_cer_5659

Hasan MS, Ivanov T, Vorkapić M. Improvement of mechanical characteristics of PLA by applying remelting process. in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia. 2021;:66-66.
https://hdl.handle.net/21.15107/rcub_cer_5659 .

Hasan, Mohammad Sakib, Ivanov, Toni, Vorkapić, Miloš, "Improvement of mechanical characteristics of PLA by applying remelting process" in Program and the Book of Abstracts - International Conference of Experimental and Numerical Investigations and New Technologies, CNN TECH 2021, 29/06-02/07 2021, Zlatibor, Serbia (2021):66-66,
https://hdl.handle.net/21.15107/rcub_cer_5659 .

TY  - CONF
AU  - Ilić, Stefan
AU  - Vorkapić, Miloš
AU  - Ivanov, Toni
AU  - Svorcan, Jelena
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5661
AB  - The application of additive technology gives a designer more freedom in designing and defining the optimal product design. Also, it is possible to make a model with different materials that have different mechanical properties in order to meet different requirements in different places inside and outside of the part. In this paper, a 3D printer Wanhao Duplicator, type i3 plus, made in the People's Republic of China, was used for the realization of the elements of a mechanical mounting system. It is a desktop 3D printer with a maximum printable area of 200 x 200 x 180 mm3, nozzle diameter of 0.1-0.4 mm, and printing speed of 10-100 mm/s (see Figure 3). For the realization of the model, the chosen material was ABS (Acrylonitrile Butadiene Styrene) in the form of a filament (diameter 1.75 mm, manufacturer Wanhao). ABS is an amorphous polymer with the following features: excellent mechanical properties, resistance to elevated temperatures, and resistance to shocks. On the Wanhao printer, the prescribed distance between the nozzle and the plate is 0.1 mm. This is the minimum thickness of a single printed layer in the xy plane. The diameter of the melted thread is 0.1 mm, which is very thin, allowing for a very dense construction of the print along the z axis. All these parameters are essential for the quality of the print. 3D printing technology enabled the custom design and fabrication of a mechanical system intended to be placed in an irradiation room, in order to hold the component whose electric characteristics are being examined. The irradiation room may contain one or more sources of ionizing radiation. Each irradiation room may have a different way of mounting the component under test. Since it is necessary to study a specific electronic component with different ionizing radiation sources (gamma and X-ray), at different dose rates, and located in different irradiation rooms, designing a custom mounting system for each irradiation room is necessary. The cost of making a mechanical mounting system using 3D printing technology is significantly lower compared to other production methods. Thus, the creation of a system for each irradiation room individually becomes more economical. Creating such a system for each irradiation room allows much easier and more accurate positioning of the component, which reduces the error in calculating the dose that the component receives during irradiation. Each mechanical system should allow the installation of printed circuit boards of different sizes, on which the tested electronic components are located. Also, the material from which the mounting system is made must not affect the component during the experiment. Materials used in 3D printing have a negligible effect on the reflection or scattering of high-energy photons because they do not contain atoms with heavy nuclei.
PB  - SIRAMM project  - H2020-WIDESPREAD-2018-03 Project No. 857124, Horizon 2020
C3  - Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia
T1  - The use of 3D printing for studying the influence of ionizing radiation on electronic components
SP  - 29
EP  - 30
UR  - https://hdl.handle.net/21.15107/rcub_cer_5661
ER  - 

@conference{
author = "Ilić, Stefan and Vorkapić, Miloš and Ivanov, Toni and Svorcan, Jelena",
year = "2021",
abstract = "The application of additive technology gives a designer more freedom in designing and defining the optimal product design. Also, it is possible to make a model with different materials that have different mechanical properties in order to meet different requirements in different places inside and outside of the part. In this paper, a 3D printer Wanhao Duplicator, type i3 plus, made in the People's Republic of China, was used for the realization of the elements of a mechanical mounting system. It is a desktop 3D printer with a maximum printable area of 200 x 200 x 180 mm3, nozzle diameter of 0.1-0.4 mm, and printing speed of 10-100 mm/s (see Figure 3). For the realization of the model, the chosen material was ABS (Acrylonitrile Butadiene Styrene) in the form of a filament (diameter 1.75 mm, manufacturer Wanhao). ABS is an amorphous polymer with the following features: excellent mechanical properties, resistance to elevated temperatures, and resistance to shocks. On the Wanhao printer, the prescribed distance between the nozzle and the plate is 0.1 mm. This is the minimum thickness of a single printed layer in the xy plane. The diameter of the melted thread is 0.1 mm, which is very thin, allowing for a very dense construction of the print along the z axis. All these parameters are essential for the quality of the print. 3D printing technology enabled the custom design and fabrication of a mechanical system intended to be placed in an irradiation room, in order to hold the component whose electric characteristics are being examined. The irradiation room may contain one or more sources of ionizing radiation. Each irradiation room may have a different way of mounting the component under test. Since it is necessary to study a specific electronic component with different ionizing radiation sources (gamma and X-ray), at different dose rates, and located in different irradiation rooms, designing a custom mounting system for each irradiation room is necessary. The cost of making a mechanical mounting system using 3D printing technology is significantly lower compared to other production methods. Thus, the creation of a system for each irradiation room individually becomes more economical. Creating such a system for each irradiation room allows much easier and more accurate positioning of the component, which reduces the error in calculating the dose that the component receives during irradiation. Each mechanical system should allow the installation of printed circuit boards of different sizes, on which the tested electronic components are located. Also, the material from which the mounting system is made must not affect the component during the experiment. Materials used in 3D printing have a negligible effect on the reflection or scattering of high-energy photons because they do not contain atoms with heavy nuclei.",
publisher = "SIRAMM project  - H2020-WIDESPREAD-2018-03 Project No. 857124, Horizon 2020",
journal = "Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia",
title = "The use of 3D printing for studying the influence of ionizing radiation on electronic components",
pages = "29-30",
url = "https://hdl.handle.net/21.15107/rcub_cer_5661"
}

Ilić, S., Vorkapić, M., Ivanov, T.,& Svorcan, J.. (2021). The use of 3D printing for studying the influence of ionizing radiation on electronic components. in Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia
SIRAMM project  - H2020-WIDESPREAD-2018-03 Project No. 857124, Horizon 2020., 29-30.
https://hdl.handle.net/21.15107/rcub_cer_5661

Ilić S, Vorkapić M, Ivanov T, Svorcan J. The use of 3D printing for studying the influence of ionizing radiation on electronic components. in Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia. 2021;:29-30.
https://hdl.handle.net/21.15107/rcub_cer_5661 .

Ilić, Stefan, Vorkapić, Miloš, Ivanov, Toni, Svorcan, Jelena, "The use of 3D printing for studying the influence of ionizing radiation on electronic components" in Program and the Book of Abstracts - International Conference East Europe Conference on Additively Manufactured Materials – EECAM21, 2nd-4th September 2021, Belgrade, Serbia (2021):29-30,
https://hdl.handle.net/21.15107/rcub_cer_5661 .

TY  - JOUR
AU  - Raković, Dragan
AU  - Simonović, Aleksandar
AU  - Grbović, Aleksandar
AU  - Radović, Ljubica
AU  - Vorkapić, Miloš
AU  - Krstić, Branimir
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4783
AB  - This paper presents the failure analysis results of the helicopter skid landing gear. The helicopter skid landing gear fractured while the helicopter was on the ground at the airport. The aft cross tube of the landing gear assembly was found fractured into two pieces. Observation of crack propagation area at low magnification revealed numerous secondary cracks, inner surface irregularities while fracture surface indicated fatigue process. Macro-fractographic analysis of the fracture surface disclosed features that gave additional indication of fatigue. Examination of mating fracture surfaces under scanning electron microscope (SEM) detected the existence of irregularities in the material. Chemical analysis showed the aft cross tube is made of high-strength aluminum alloy. The stress analysis of skid landing gear, using the finite element method (FEM), has identified the stress-deformation condition of the helicopter landing gear with a detail insight of the stress state in the vicinity of the crack origin. The stress value, in case of maximal takeoff weight, was very high in the crack initiation zone. The results indicate the superposition of manufacturing-in, designing-in as well as operating in defects which led to total failure of the helicopter skid landing gear aft cross tube.
PB  - Elsevier
T2  - Engineering Failure Analysis
T1  - Fatigue fracture analysis of helicopter landing gear cross tube
VL  - 129
SP  - 105672
DO  - 10.1016/j.engfailanal.2021.105672
ER  - 

@article{
author = "Raković, Dragan and Simonović, Aleksandar and Grbović, Aleksandar and Radović, Ljubica and Vorkapić, Miloš and Krstić, Branimir",
year = "2021",
abstract = "This paper presents the failure analysis results of the helicopter skid landing gear. The helicopter skid landing gear fractured while the helicopter was on the ground at the airport. The aft cross tube of the landing gear assembly was found fractured into two pieces. Observation of crack propagation area at low magnification revealed numerous secondary cracks, inner surface irregularities while fracture surface indicated fatigue process. Macro-fractographic analysis of the fracture surface disclosed features that gave additional indication of fatigue. Examination of mating fracture surfaces under scanning electron microscope (SEM) detected the existence of irregularities in the material. Chemical analysis showed the aft cross tube is made of high-strength aluminum alloy. The stress analysis of skid landing gear, using the finite element method (FEM), has identified the stress-deformation condition of the helicopter landing gear with a detail insight of the stress state in the vicinity of the crack origin. The stress value, in case of maximal takeoff weight, was very high in the crack initiation zone. The results indicate the superposition of manufacturing-in, designing-in as well as operating in defects which led to total failure of the helicopter skid landing gear aft cross tube.",
publisher = "Elsevier",
journal = "Engineering Failure Analysis",
title = "Fatigue fracture analysis of helicopter landing gear cross tube",
volume = "129",
pages = "105672",
doi = "10.1016/j.engfailanal.2021.105672"
}

Raković, D., Simonović, A., Grbović, A., Radović, L., Vorkapić, M.,& Krstić, B.. (2021). Fatigue fracture analysis of helicopter landing gear cross tube. in Engineering Failure Analysis
Elsevier., 129, 105672.
https://doi.org/10.1016/j.engfailanal.2021.105672

Raković D, Simonović A, Grbović A, Radović L, Vorkapić M, Krstić B. Fatigue fracture analysis of helicopter landing gear cross tube. in Engineering Failure Analysis. 2021;129:105672.
doi:10.1016/j.engfailanal.2021.105672 .

Raković, Dragan, Simonović, Aleksandar, Grbović, Aleksandar, Radović, Ljubica, Vorkapić, Miloš, Krstić, Branimir, "Fatigue fracture analysis of helicopter landing gear cross tube" in Engineering Failure Analysis, 129 (2021):105672,
https://doi.org/10.1016/j.engfailanal.2021.105672 . .

TY  - CONF
AU  - Svorcan, Jelena
AU  - Peković, Ognjen
AU  - Ivanov, Toni
AU  - Vorkapić, Miloš
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3918
AB  - With wind energy extraction constantly increasing, the interest in small-scale urban wind turbines
is also expanding. Given that these machines often work in adverse operating conditions
(Earth’s boundary layer, vortex trails of surrounding objects, small and changeable wind speeds),
additional elements that locally augment wind velocity and facilitate turbine start may be installed.
This paper investigates possible benefits of adding an optimized flow concentrator to a vertical-axis
wind turbine (VAWT) rotor. Three-dimensional, unsteady, turbulent, incompressible flow simulations
of both isolated rotor consisting of three straight blades and a rotor with flow concentrator have been
performed in ANSYS FLUENT by finite volume method for several different operational regimes. This
type of flow simulations is challenging since flow angles are high, numerous flow phenomena and
instabilities are present and the interaction between the blades and detached vortices can be significant.
The rotational motion of the blades is solved by the unsteady Sliding Mesh (SM) approach. Flow
field is modeled by Unsteady Reynolds Averaged Navier-Stokes (URANS) equations with k-ω SST
turbulence model used for closure. Both quantitative and qualitative examinations of the obtained
numerical results are presented. In particular, the two computed power coefficient curves are compared
and the advantages of installing a flow concentrator are accentuated.
AB  - Usled stalnog porasta iskorišćenja energije vetra, interesovanje za male vetroturbine za urbane sredine se takođe širi. Kako ovakve mašine često funkcionišu u nepovoljnim radnim uslovima (Zemljinom graničnom sloju, vrtložnom tragu okolnih objekata, pri maloj i promenljivoj brzini vetra), moguće je instalirati dodatne elemente čija uloga je da lokalno povećaju brzinu kroz rotor i olakšaju pokretanje vetroturbine. Ovaj rad istražuje prednosti dodavanja optimizovanog koncentratora struje vazduha rotoru vetroturbine sa vertikalnom osom obrtanja. Prostorne, nestacionarne simulacije turbulentnog, nestišljivog opstrujavanja izolovanog rotora koji sadrži tri prave lopatice kao i rotora sa koncentratorom izvedene su u softverskom paketu ANSYS FLUENT metodom konačnih zapremina za nekoliko različitih radnih režima. Ova vrsta proračuna je izazovna jer su napadni uglovi visoki, javljaju se brojni strujni fenomeni i nestabilnosti dok interakcija između lopatica i odvojenih vrtloga može biti značajna.Obrtno kretanje lopatica rešeno je pristupom klizajućih mreža. Strujno polje modelovano je nestacionarnim Navije-Stoksovim jednačinama osrednjenim Rejnoldsovom statistikom (URANS) koje su zatvorene k-ω SST turbulentnim modelom. Prikazane su i kvantitativne i kvalitativne analize dobijenih numeričkih rezultata. Naročito je izvršeno poređenje dve krive koeficijenta snage i naglašene su prednosti instaliranja koncentratora struje vazduha.
PB  - Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS, Beograd
C3  - 8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia
T1  - Numerical evaluation of aerodynamic performances of vertical-axis wind turbine rotor with flow concentrator
SP  - 135
EP  - 141
UR  - https://hdl.handle.net/21.15107/rcub_cer_3918
ER  - 

@conference{
author = "Svorcan, Jelena and Peković, Ognjen and Ivanov, Toni and Vorkapić, Miloš",
year = "2020",
abstract = "With wind energy extraction constantly increasing, the interest in small-scale urban wind turbines
is also expanding. Given that these machines often work in adverse operating conditions
(Earth’s boundary layer, vortex trails of surrounding objects, small and changeable wind speeds),
additional elements that locally augment wind velocity and facilitate turbine start may be installed.
This paper investigates possible benefits of adding an optimized flow concentrator to a vertical-axis
wind turbine (VAWT) rotor. Three-dimensional, unsteady, turbulent, incompressible flow simulations
of both isolated rotor consisting of three straight blades and a rotor with flow concentrator have been
performed in ANSYS FLUENT by finite volume method for several different operational regimes. This
type of flow simulations is challenging since flow angles are high, numerous flow phenomena and
instabilities are present and the interaction between the blades and detached vortices can be significant.
The rotational motion of the blades is solved by the unsteady Sliding Mesh (SM) approach. Flow
field is modeled by Unsteady Reynolds Averaged Navier-Stokes (URANS) equations with k-ω SST
turbulence model used for closure. Both quantitative and qualitative examinations of the obtained
numerical results are presented. In particular, the two computed power coefficient curves are compared
and the advantages of installing a flow concentrator are accentuated., Usled stalnog porasta iskorišćenja energije vetra, interesovanje za male vetroturbine za urbane sredine se takođe širi. Kako ovakve mašine često funkcionišu u nepovoljnim radnim uslovima (Zemljinom graničnom sloju, vrtložnom tragu okolnih objekata, pri maloj i promenljivoj brzini vetra), moguće je instalirati dodatne elemente čija uloga je da lokalno povećaju brzinu kroz rotor i olakšaju pokretanje vetroturbine. Ovaj rad istražuje prednosti dodavanja optimizovanog koncentratora struje vazduha rotoru vetroturbine sa vertikalnom osom obrtanja. Prostorne, nestacionarne simulacije turbulentnog, nestišljivog opstrujavanja izolovanog rotora koji sadrži tri prave lopatice kao i rotora sa koncentratorom izvedene su u softverskom paketu ANSYS FLUENT metodom konačnih zapremina za nekoliko različitih radnih režima. Ova vrsta proračuna je izazovna jer su napadni uglovi visoki, javljaju se brojni strujni fenomeni i nestabilnosti dok interakcija između lopatica i odvojenih vrtloga može biti značajna.Obrtno kretanje lopatica rešeno je pristupom klizajućih mreža. Strujno polje modelovano je nestacionarnim Navije-Stoksovim jednačinama osrednjenim Rejnoldsovom statistikom (URANS) koje su zatvorene k-ω SST turbulentnim modelom. Prikazane su i kvantitativne i kvalitativne analize dobijenih numeričkih rezultata. Naročito je izvršeno poređenje dve krive koeficijenta snage i naglašene su prednosti instaliranja koncentratora struje vazduha.",
publisher = "Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS, Beograd",
journal = "8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia",
title = "Numerical evaluation of aerodynamic performances of vertical-axis wind turbine rotor with flow concentrator",
pages = "135-141",
url = "https://hdl.handle.net/21.15107/rcub_cer_3918"
}

Svorcan, J., Peković, O., Ivanov, T.,& Vorkapić, M.. (2020). Numerical evaluation of aerodynamic performances of vertical-axis wind turbine rotor with flow concentrator. in 8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia
Savez mašinskih i elektrotehničkih inženjera i tehničara Srbije - SMEITS, Beograd., 135-141.
https://hdl.handle.net/21.15107/rcub_cer_3918

Svorcan J, Peković O, Ivanov T, Vorkapić M. Numerical evaluation of aerodynamic performances of vertical-axis wind turbine rotor with flow concentrator. in 8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia. 2020;:135-141.
https://hdl.handle.net/21.15107/rcub_cer_3918 .

Svorcan, Jelena, Peković, Ognjen, Ivanov, Toni, Vorkapić, Miloš, "Numerical evaluation of aerodynamic performances of vertical-axis wind turbine rotor with flow concentrator" in 8th International Conference on Renewable Electrical Power Sources (8. Međunarodna konferencija o obnovljivim izvorima električne energije), ICREPS 2020, October 16, Belgrade, Serbia (2020):135-141,
https://hdl.handle.net/21.15107/rcub_cer_3918 .

TY  - CHAP
AU  - Vorkapić, Miloš
AU  - Simonović, Aleksandar
AU  - Ivanov, Toni
PY  - 2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3972
AB  - Additive manufacturing technology helped many organizations to save
money in the product design process by reducing prototype costs, and also by providing a means for early evaluation and decision making. The idea of this paper is
to design an electronics enclosure for an intelligent industrial pressure transmitter,
using the additive technology. All enclosure elements are made on a 3D printer
WANHAO duplicator i3 plus, using PLA materials. The enclosure realization,
from CAD drawings to the finished model, enables a designer to correct existing errors, or make certain modifications as required by end-users. A process is
described that enables designers to review their decisions at any stage of product
realization, thus providing much more freedom in rapid prototyping. In this example, the advantages and disadvantages of additive manufacturing over conventional
manufacturing are outlined. Some deficiencies have also been observed, such as
mechanical damage to surfaces, burning of surfaces, tearing of prints, and surface
roughness. To mitigate such irregularities, both mechanical and chemical finishing
methods were used. The example confirmed that the finishing methods can affect
the final enclosure dimensions and shape. Further prototype development should
focus more on print quality, which depends on the shape of surfaces, the accuracy
of the geometry, the uniformity of structure and shape, material density, and the
resolution of details.
PB  - Springer
T2  - Lecture Notes in Networks and Systems - Experimental and Computational Investigations in Engineering
T1  - Algorithm for Applying 3D Printing in Prototype Realization – Case: Enclosure for an Industrial Pressure Transmitter
VL  - 153
SP  - 112
EP  - 129
DO  - 10.1007/978-3-030-58362-0_8
ER  - 

@inbook{
author = "Vorkapić, Miloš and Simonović, Aleksandar and Ivanov, Toni",
year = "2020",
abstract = "Additive manufacturing technology helped many organizations to save
money in the product design process by reducing prototype costs, and also by providing a means for early evaluation and decision making. The idea of this paper is
to design an electronics enclosure for an intelligent industrial pressure transmitter,
using the additive technology. All enclosure elements are made on a 3D printer
WANHAO duplicator i3 plus, using PLA materials. The enclosure realization,
from CAD drawings to the finished model, enables a designer to correct existing errors, or make certain modifications as required by end-users. A process is
described that enables designers to review their decisions at any stage of product
realization, thus providing much more freedom in rapid prototyping. In this example, the advantages and disadvantages of additive manufacturing over conventional
manufacturing are outlined. Some deficiencies have also been observed, such as
mechanical damage to surfaces, burning of surfaces, tearing of prints, and surface
roughness. To mitigate such irregularities, both mechanical and chemical finishing
methods were used. The example confirmed that the finishing methods can affect
the final enclosure dimensions and shape. Further prototype development should
focus more on print quality, which depends on the shape of surfaces, the accuracy
of the geometry, the uniformity of structure and shape, material density, and the
resolution of details.",
publisher = "Springer",
journal = "Lecture Notes in Networks and Systems - Experimental and Computational Investigations in Engineering",
booktitle = "Algorithm for Applying 3D Printing in Prototype Realization – Case: Enclosure for an Industrial Pressure Transmitter",
volume = "153",
pages = "112-129",
doi = "10.1007/978-3-030-58362-0_8"
}

Vorkapić, M., Simonović, A.,& Ivanov, T.. (2020). Algorithm for Applying 3D Printing in Prototype Realization – Case: Enclosure for an Industrial Pressure Transmitter. in Lecture Notes in Networks and Systems - Experimental and Computational Investigations in Engineering
Springer., 153, 112-129.
https://doi.org/10.1007/978-3-030-58362-0_8

Vorkapić M, Simonović A, Ivanov T. Algorithm for Applying 3D Printing in Prototype Realization – Case: Enclosure for an Industrial Pressure Transmitter. in Lecture Notes in Networks and Systems - Experimental and Computational Investigations in Engineering. 2020;153:112-129.
doi:10.1007/978-3-030-58362-0_8 .

Vorkapić, Miloš, Simonović, Aleksandar, Ivanov, Toni, "Algorithm for Applying 3D Printing in Prototype Realization – Case: Enclosure for an Industrial Pressure Transmitter" in Lecture Notes in Networks and Systems - Experimental and Computational Investigations in Engineering, 153 (2020):112-129,
https://doi.org/10.1007/978-3-030-58362-0_8 . .