TY  - CONF
AU  - Gligorijević, Bojan R.
AU  - Katavić, Boris T.
AU  - Alil, Ana
AU  - Jegdić, Bore V.
AU  - Ristić, Marko
AU  - Prokolab, Milan
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7500
AB  - As-received floating-head heat exchanger bolts were broken (BB) and deposite-coated. The aim was to estimatea cause of their failure. The new bolts of the same material were used as a reference material (reference bolt –RB). After visual and radiographic examination, their chemical composition, structure and room-temperaturemechanical properties were determined and compared. Comparison was made with the values set by standard,as well. Afterwards, fractography was performed on fractured surfaces of tensile specimens and originally(during exploitation) BBs to try to get an impression about bolts failure mechanism. Qualitative analysis ofdeposite was employed in order to confirm was there any possible influence of surroundings during their failurein terms of corrosion-assisted cracking. Chemical composition of RB and BB materials was analyzed by use ofspectrophotometry and structure properties with light optical microscope (LOM). Fractured surfaces of tensilespecimens and of BBs, as well as deposite chemistry, were analyzed by use of Scanning Electron Microscopywith Energy Dispersive System (SEM-EDS). BBs had an approximately three times higher sulphur content andlesser manganese content, lower ductility and higher strength values comparing to those of the RBs. Generally,fracture surfaces of both, RB and BB tensile specimens have a similar rosette-like macro-appearance. The onlydifference is that the radial marks in the case of the RBs are rougher. The surface has a more fibrous area andshear lip presence. Fracture mode can be characterized as dimple rupture and micromechanism as microvoidcoalescence. In the case of BB tensile specimens, the mixed presence of dimples and cleavage facets wasnoticed. The macrofractography of originally broken surfaces shows a rough and complex topography offracture surfaces indicating on a possibility that bolts failure has been a result of complex loading conditions.Presence of sulphur- and chlorine-containing particles on the fracture surfaces of BBs and in deposite reveals apossibility that failure was environmentally-assisted.
PB  - Timisoara, Romania : SUDURA publising house
C3  - Proceedings of the 9th International Conference “Structural integrity of welded structures”, 03-04.11.2011, Timisoara, Romania
T1  - Analysis of floating-head heat exchanger bolts failure
SP  - 1
EP  - 9
UR  - https://hdl.handle.net/21.15107/rcub_cer_7500
ER  - 

@conference{
author = "Gligorijević, Bojan R. and Katavić, Boris T. and Alil, Ana and Jegdić, Bore V. and Ristić, Marko and Prokolab, Milan",
year = "2011",
abstract = "As-received floating-head heat exchanger bolts were broken (BB) and deposite-coated. The aim was to estimatea cause of their failure. The new bolts of the same material were used as a reference material (reference bolt –RB). After visual and radiographic examination, their chemical composition, structure and room-temperaturemechanical properties were determined and compared. Comparison was made with the values set by standard,as well. Afterwards, fractography was performed on fractured surfaces of tensile specimens and originally(during exploitation) BBs to try to get an impression about bolts failure mechanism. Qualitative analysis ofdeposite was employed in order to confirm was there any possible influence of surroundings during their failurein terms of corrosion-assisted cracking. Chemical composition of RB and BB materials was analyzed by use ofspectrophotometry and structure properties with light optical microscope (LOM). Fractured surfaces of tensilespecimens and of BBs, as well as deposite chemistry, were analyzed by use of Scanning Electron Microscopywith Energy Dispersive System (SEM-EDS). BBs had an approximately three times higher sulphur content andlesser manganese content, lower ductility and higher strength values comparing to those of the RBs. Generally,fracture surfaces of both, RB and BB tensile specimens have a similar rosette-like macro-appearance. The onlydifference is that the radial marks in the case of the RBs are rougher. The surface has a more fibrous area andshear lip presence. Fracture mode can be characterized as dimple rupture and micromechanism as microvoidcoalescence. In the case of BB tensile specimens, the mixed presence of dimples and cleavage facets wasnoticed. The macrofractography of originally broken surfaces shows a rough and complex topography offracture surfaces indicating on a possibility that bolts failure has been a result of complex loading conditions.Presence of sulphur- and chlorine-containing particles on the fracture surfaces of BBs and in deposite reveals apossibility that failure was environmentally-assisted.",
publisher = "Timisoara, Romania : SUDURA publising house",
journal = "Proceedings of the 9th International Conference “Structural integrity of welded structures”, 03-04.11.2011, Timisoara, Romania",
title = "Analysis of floating-head heat exchanger bolts failure",
pages = "1-9",
url = "https://hdl.handle.net/21.15107/rcub_cer_7500"
}

Gligorijević, B. R., Katavić, B. T., Alil, A., Jegdić, B. V., Ristić, M.,& Prokolab, M.. (2011). Analysis of floating-head heat exchanger bolts failure. in Proceedings of the 9th International Conference “Structural integrity of welded structures”, 03-04.11.2011, Timisoara, Romania
Timisoara, Romania : SUDURA publising house., 1-9.
https://hdl.handle.net/21.15107/rcub_cer_7500

Gligorijević BR, Katavić BT, Alil A, Jegdić BV, Ristić M, Prokolab M. Analysis of floating-head heat exchanger bolts failure. in Proceedings of the 9th International Conference “Structural integrity of welded structures”, 03-04.11.2011, Timisoara, Romania. 2011;:1-9.
https://hdl.handle.net/21.15107/rcub_cer_7500 .

Gligorijević, Bojan R., Katavić, Boris T., Alil, Ana, Jegdić, Bore V., Ristić, Marko, Prokolab, Milan, "Analysis of floating-head heat exchanger bolts failure" in Proceedings of the 9th International Conference “Structural integrity of welded structures”, 03-04.11.2011, Timisoara, Romania (2011):1-9,
https://hdl.handle.net/21.15107/rcub_cer_7500 .

TY  - CONF
AU  - Alil, Ana
AU  - Gligorijević, Bojan R.
AU  - Prvulović, Mirjana
AU  - Budimir, Stevan
AU  - Ristić, Marko
AU  - Prokolab, Milan
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7498
AB  - The aim was to investigate the cause of failure of as-received ultra-high strength steel springs,which were deposite-coated. The qualitative analysis of surrounding environment was performed.Springs were visually and radiographically examined. Their chemical composition was determinedusing spectrophotometer, primary and secondary structure by use of bright-field reflected lightmicroscope with vertical illumination source, and fracture mechanism by scanning electronmicroscope with energy dispersive system. Macro-hardness measurements were employed, also.The phases present in deposite were identified using X-ray Powder Difractometry and ElectronMicroprobe analysis. The safety valve springs failure is caused probably by corrosion-assistedprocess with presence of overloading.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - 10th Young Researchers' Conference Materials Sciences and Engineering
T1  - Assessment of Safety Valve Springs Failure
SP  - 42
EP  - 42
UR  - https://hdl.handle.net/21.15107/rcub_cer_7498
ER  - 

@conference{
author = "Alil, Ana and Gligorijević, Bojan R. and Prvulović, Mirjana and Budimir, Stevan and Ristić, Marko and Prokolab, Milan",
year = "2011",
abstract = "The aim was to investigate the cause of failure of as-received ultra-high strength steel springs,which were deposite-coated. The qualitative analysis of surrounding environment was performed.Springs were visually and radiographically examined. Their chemical composition was determinedusing spectrophotometer, primary and secondary structure by use of bright-field reflected lightmicroscope with vertical illumination source, and fracture mechanism by scanning electronmicroscope with energy dispersive system. Macro-hardness measurements were employed, also.The phases present in deposite were identified using X-ray Powder Difractometry and ElectronMicroprobe analysis. The safety valve springs failure is caused probably by corrosion-assistedprocess with presence of overloading.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "10th Young Researchers' Conference Materials Sciences and Engineering",
title = "Assessment of Safety Valve Springs Failure",
pages = "42-42",
url = "https://hdl.handle.net/21.15107/rcub_cer_7498"
}

Alil, A., Gligorijević, B. R., Prvulović, M., Budimir, S., Ristić, M.,& Prokolab, M.. (2011). Assessment of Safety Valve Springs Failure. in 10th Young Researchers' Conference Materials Sciences and Engineering
Belgrade : Institute of Technical Sciences of SASA., 42-42.
https://hdl.handle.net/21.15107/rcub_cer_7498

Alil A, Gligorijević BR, Prvulović M, Budimir S, Ristić M, Prokolab M. Assessment of Safety Valve Springs Failure. in 10th Young Researchers' Conference Materials Sciences and Engineering. 2011;:42-42.
https://hdl.handle.net/21.15107/rcub_cer_7498 .

Alil, Ana, Gligorijević, Bojan R., Prvulović, Mirjana, Budimir, Stevan, Ristić, Marko, Prokolab, Milan, "Assessment of Safety Valve Springs Failure" in 10th Young Researchers' Conference Materials Sciences and Engineering (2011):42-42,
https://hdl.handle.net/21.15107/rcub_cer_7498 .