TY  - JOUR
AU  - Sedmak, Aleksandar
AU  - Grbović, Aleksandar
AU  - Zaidi, Radzeya
AU  - Kirin, Snežana
AU  - Vitas, Nikola
AU  - Golubović, Tamara
AU  - Vučetić, Ivana
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/7154
AB  - Numerical and analytical methods are applied to determine the remaining life of oil rig pipe with an axial crack.
Analytical expressions for surface cracks are used to calculate stress intensity factors for different crack geometries
and estimate the remaining life directly by using Paris law.
The same procedure is applied by using the FEM, verified
previously by experimental results. Good agreement between
analytical and numerical results is demonstrated.
AB  - Primenjene su numeričke i analitičke metode za određivanje preostalog veka cevi naftne platforme sa aksijalnom
prslinom. Analitički izrazi za površinske prsline korišćeni
su za izračunavanje faktora intenziteta napona za različite
geometrije prsline i za procenu preostalog veka korišćenjem Parisovog zakona. Isti postupak je primenjen korišćenjem MKE, prethodno verifikovan eksperimentom. Pokazano je dobro slaganje analitičkih i numeričkih rezultata.
PB  - Society for Structural Integrity and Life (DIVK)
T2  - Structural Integrity and Life
T1  - NUMERICAL, ANALYTICAL AND EXPERIMENTAL DETERMINATION OF REMAINING LIFE OF A PIPE WITH AN AXIAL CRACK
T1  - NUMERIČKO, ANALITIČKO I EKSPERIMENTALNO ODREĐIVANJE PREOSTALOG VEKA CEVI SA OSNOM PRSLINOM
EP  - 244
IS  - 3
SP  - 239
VL  - 23
UR  - https://hdl.handle.net/21.15107/rcub_technorep_7154
ER  - 

@article{
author = "Sedmak, Aleksandar and Grbović, Aleksandar and Zaidi, Radzeya and Kirin, Snežana and Vitas, Nikola and Golubović, Tamara and Vučetić, Ivana",
year = "2023",
abstract = "Numerical and analytical methods are applied to determine the remaining life of oil rig pipe with an axial crack.
Analytical expressions for surface cracks are used to calculate stress intensity factors for different crack geometries
and estimate the remaining life directly by using Paris law.
The same procedure is applied by using the FEM, verified
previously by experimental results. Good agreement between
analytical and numerical results is demonstrated., Primenjene su numeričke i analitičke metode za određivanje preostalog veka cevi naftne platforme sa aksijalnom
prslinom. Analitički izrazi za površinske prsline korišćeni
su za izračunavanje faktora intenziteta napona za različite
geometrije prsline i za procenu preostalog veka korišćenjem Parisovog zakona. Isti postupak je primenjen korišćenjem MKE, prethodno verifikovan eksperimentom. Pokazano je dobro slaganje analitičkih i numeričkih rezultata.",
publisher = "Society for Structural Integrity and Life (DIVK)",
journal = "Structural Integrity and Life",
title = "NUMERICAL, ANALYTICAL AND EXPERIMENTAL DETERMINATION OF REMAINING LIFE OF A PIPE WITH AN AXIAL CRACK, NUMERIČKO, ANALITIČKO I EKSPERIMENTALNO ODREĐIVANJE PREOSTALOG VEKA CEVI SA OSNOM PRSLINOM",
pages = "244-239",
number = "3",
volume = "23",
url = "https://hdl.handle.net/21.15107/rcub_technorep_7154"
}

Sedmak, A., Grbović, A., Zaidi, R., Kirin, S., Vitas, N., Golubović, T.,& Vučetić, I.. (2023). NUMERICAL, ANALYTICAL AND EXPERIMENTAL DETERMINATION OF REMAINING LIFE OF A PIPE WITH AN AXIAL CRACK. in Structural Integrity and Life
Society for Structural Integrity and Life (DIVK)., 23(3), 239-244.
https://hdl.handle.net/21.15107/rcub_technorep_7154

Sedmak A, Grbović A, Zaidi R, Kirin S, Vitas N, Golubović T, Vučetić I. NUMERICAL, ANALYTICAL AND EXPERIMENTAL DETERMINATION OF REMAINING LIFE OF A PIPE WITH AN AXIAL CRACK. in Structural Integrity and Life. 2023;23(3):239-244.
https://hdl.handle.net/21.15107/rcub_technorep_7154 .

Sedmak, Aleksandar, Grbović, Aleksandar, Zaidi, Radzeya, Kirin, Snežana, Vitas, Nikola, Golubović, Tamara, Vučetić, Ivana, "NUMERICAL, ANALYTICAL AND EXPERIMENTAL DETERMINATION OF REMAINING LIFE OF A PIPE WITH AN AXIAL CRACK" in Structural Integrity and Life, 23, no. 3 (2023):239-244,
https://hdl.handle.net/21.15107/rcub_technorep_7154 .

TY  - JOUR
AU  - Dojčinović, Marina
AU  - Prokić Cvetković, Radica
AU  - Sedmak, Aleksandar
AU  - Popović, Olivera
AU  - Cvetković, Ivana
AU  - Radu, Dorin
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6585
AB  - The effect of the shielding gas arc welding process on the cavitation resistance of the three-component aluminum alloy AlMg4.5Mn and its welded joints was investigated. Welding was performed using the GTAW and GMAW processes in a shielded atmosphere of pure argon. After the welding, metallographic tests were performed, and the hardness distribution in the welded joints was determined. The ultrasonic vibration method was used to evaluate the base metal’s and weld metal’s resistance to cavitation. The change in mass was monitored to determine the cavitation rates. The morphology of the surface damage of the base metal and weld metal due to cavitation was monitored using scanning electron microscopy to explain the effect of the shielding gas arc welding process on their resistance to cavitation.
PB  - MDPI
T2  - Materials
T1  - Effect of Shielding Gas Arc Welding Process on Cavitation Resistance of Welded Joints of AlMg4.5Mn Alloy
IS  - 13
SP  - 4781
VL  - 16
DO  - 10.3390/ma16134781
ER  - 

@article{
author = "Dojčinović, Marina and Prokić Cvetković, Radica and Sedmak, Aleksandar and Popović, Olivera and Cvetković, Ivana and Radu, Dorin",
year = "2023",
abstract = "The effect of the shielding gas arc welding process on the cavitation resistance of the three-component aluminum alloy AlMg4.5Mn and its welded joints was investigated. Welding was performed using the GTAW and GMAW processes in a shielded atmosphere of pure argon. After the welding, metallographic tests were performed, and the hardness distribution in the welded joints was determined. The ultrasonic vibration method was used to evaluate the base metal’s and weld metal’s resistance to cavitation. The change in mass was monitored to determine the cavitation rates. The morphology of the surface damage of the base metal and weld metal due to cavitation was monitored using scanning electron microscopy to explain the effect of the shielding gas arc welding process on their resistance to cavitation.",
publisher = "MDPI",
journal = "Materials",
title = "Effect of Shielding Gas Arc Welding Process on Cavitation Resistance of Welded Joints of AlMg4.5Mn Alloy",
number = "13",
pages = "4781",
volume = "16",
doi = "10.3390/ma16134781"
}

Dojčinović, M., Prokić Cvetković, R., Sedmak, A., Popović, O., Cvetković, I.,& Radu, D.. (2023). Effect of Shielding Gas Arc Welding Process on Cavitation Resistance of Welded Joints of AlMg4.5Mn Alloy. in Materials
MDPI., 16(13), 4781.
https://doi.org/10.3390/ma16134781

Dojčinović M, Prokić Cvetković R, Sedmak A, Popović O, Cvetković I, Radu D. Effect of Shielding Gas Arc Welding Process on Cavitation Resistance of Welded Joints of AlMg4.5Mn Alloy. in Materials. 2023;16(13):4781.
doi:10.3390/ma16134781 .

Dojčinović, Marina, Prokić Cvetković, Radica, Sedmak, Aleksandar, Popović, Olivera, Cvetković, Ivana, Radu, Dorin, "Effect of Shielding Gas Arc Welding Process on Cavitation Resistance of Welded Joints of AlMg4.5Mn Alloy" in Materials, 16, no. 13 (2023):4781,
https://doi.org/10.3390/ma16134781 . .

TY  - CONF
AU  - Sedmak, Aleksandar
AU  - Martić, Igor
AU  - Jeremić, Lazar
AU  - Kirin, Snežana
AU  - Golubović, Tamara
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6430
AB  - The effect of proof over-pressure on pressure vessels structural integrity is analysed. Risk based approach is applied using Failure Analysis Diagramme to assess likelihood of failure. Special attention is paid to crack-like defects detected by NDT regular testing which are unacceptable by standards, but difficult to be repaired. It was show, using two examples, that such defects can remain if some strict conditions are fulfilled. In any case, with or without crack-like defects, it was shown that testing of pressure vessels with significant over-pressure can cause much more problems than it has benefits, because it acts more like the first step in eventual failure, than being proof to anything.
PB  - Elsevier B.V.
C3  - 23rd European Conference on Fracture, ECF 2022, Procedia Structural Integrity
T1  - Effects of Over-Loading on Pressure Vessel Integrity
EP  - 361
SP  - 356
VL  - 42
DO  - 10.1016/j.prostr.2022.12.044
ER  - 

@conference{
author = "Sedmak, Aleksandar and Martić, Igor and Jeremić, Lazar and Kirin, Snežana and Golubović, Tamara",
year = "2022",
abstract = "The effect of proof over-pressure on pressure vessels structural integrity is analysed. Risk based approach is applied using Failure Analysis Diagramme to assess likelihood of failure. Special attention is paid to crack-like defects detected by NDT regular testing which are unacceptable by standards, but difficult to be repaired. It was show, using two examples, that such defects can remain if some strict conditions are fulfilled. In any case, with or without crack-like defects, it was shown that testing of pressure vessels with significant over-pressure can cause much more problems than it has benefits, because it acts more like the first step in eventual failure, than being proof to anything.",
publisher = "Elsevier B.V.",
journal = "23rd European Conference on Fracture, ECF 2022, Procedia Structural Integrity",
title = "Effects of Over-Loading on Pressure Vessel Integrity",
pages = "361-356",
volume = "42",
doi = "10.1016/j.prostr.2022.12.044"
}

Sedmak, A., Martić, I., Jeremić, L., Kirin, S.,& Golubović, T.. (2022). Effects of Over-Loading on Pressure Vessel Integrity. in 23rd European Conference on Fracture, ECF 2022, Procedia Structural Integrity
Elsevier B.V.., 42, 356-361.
https://doi.org/10.1016/j.prostr.2022.12.044

Sedmak A, Martić I, Jeremić L, Kirin S, Golubović T. Effects of Over-Loading on Pressure Vessel Integrity. in 23rd European Conference on Fracture, ECF 2022, Procedia Structural Integrity. 2022;42:356-361.
doi:10.1016/j.prostr.2022.12.044 .

Sedmak, Aleksandar, Martić, Igor, Jeremić, Lazar, Kirin, Snežana, Golubović, Tamara, "Effects of Over-Loading on Pressure Vessel Integrity" in 23rd European Conference on Fracture, ECF 2022, Procedia Structural Integrity, 42 (2022):356-361,
https://doi.org/10.1016/j.prostr.2022.12.044 . .

TY  - CONF
AU  - Mladenović, Goran
AU  - Živanović, Sasa
AU  - Milošević, Miloš
AU  - sedmak, aleksandar
AU  - Plohar, Andrej
AU  - Ivanovic, Ivana
AU  - Rakin, Marko
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6340
AB  - Reformer is an integral component of the polymeric electrolyte membrane (PEM) fuel cell and it is used for
experimental combustion testing. By analyzing the geometry of the experimental reformer, it consists of three
plates, two pins for leading and a single screw for sealing. In terms of technological analysis for
manufacturing of the experimental reformer emphasis was thrown on the intermediate plate which is
necessary to carry out Wire EDM machining. Before the machining based on CAD models it was performed
tool part generation in order to perform machining simulation. In order to minimize manufacturing costs by
techno-economic analysis it was varying the wire thickness, and therefore cutting parameters. Besides the
variation of the cutting parameters it was varied and the intermediate plate thickness. It was made a three
sets of experimental reformer, wherein the electrical discharge machining (EDM) was performed on two
machines (Mitsubishi FA-10S Wire EDM and "Ewis" EV.00.000M4) with two different wire thickness. After
machining is was carried out the welding procedure, and after that re-machining in order of remove the
excess material which is applied by welding process.
PB  - Innovation Center of Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH
T1  - Technological analysis for machining of the reformers for fuel cells testing
SP  - 52
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6340
ER  - 

@conference{
author = "Mladenović, Goran and Živanović, Sasa and Milošević, Miloš and sedmak, aleksandar and Plohar, Andrej and Ivanovic, Ivana and Rakin, Marko",
year = "2017",
abstract = "Reformer is an integral component of the polymeric electrolyte membrane (PEM) fuel cell and it is used for
experimental combustion testing. By analyzing the geometry of the experimental reformer, it consists of three
plates, two pins for leading and a single screw for sealing. In terms of technological analysis for
manufacturing of the experimental reformer emphasis was thrown on the intermediate plate which is
necessary to carry out Wire EDM machining. Before the machining based on CAD models it was performed
tool part generation in order to perform machining simulation. In order to minimize manufacturing costs by
techno-economic analysis it was varying the wire thickness, and therefore cutting parameters. Besides the
variation of the cutting parameters it was varied and the intermediate plate thickness. It was made a three
sets of experimental reformer, wherein the electrical discharge machining (EDM) was performed on two
machines (Mitsubishi FA-10S Wire EDM and "Ewis" EV.00.000M4) with two different wire thickness. After
machining is was carried out the welding procedure, and after that re-machining in order of remove the
excess material which is applied by welding process.",
publisher = "Innovation Center of Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH",
title = "Technological analysis for machining of the reformers for fuel cells testing",
pages = "52",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6340"
}

Mladenović, G., Živanović, S., Milošević, M., sedmak, a., Plohar, A., Ivanovic, I.,& Rakin, M.. (2017). Technological analysis for machining of the reformers for fuel cells testing. in International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH
Innovation Center of Faculty of Mechanical Engineering., 52.
https://hdl.handle.net/21.15107/rcub_technorep_6340

Mladenović G, Živanović S, Milošević M, sedmak A, Plohar A, Ivanovic I, Rakin M. Technological analysis for machining of the reformers for fuel cells testing. in International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH. 2017;:52.
https://hdl.handle.net/21.15107/rcub_technorep_6340 .

Mladenović, Goran, Živanović, Sasa, Milošević, Miloš, sedmak, aleksandar, Plohar, Andrej, Ivanovic, Ivana, Rakin, Marko, "Technological analysis for machining of the reformers for fuel cells testing" in International Conference of Experimental and Numerical Investigations and New Technologies - CNN TECH (2017):52,
https://hdl.handle.net/21.15107/rcub_technorep_6340 .