TY  - JOUR
AU  - Međo, Bojan
AU  - Rakin, Marko
AU  - Arsić, Miodrag
AU  - Damnjanović, Ivana
AU  - Stefanović, Ana
AU  - Grabulov, Vencislav
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6016
AB  - The defects in pipe elbows can, depending on their size and position, affect the integrity and safe service, as well as deformation ability of the piping systems in exploitation. Incompletely filled groove, which is the type of defect examined here, was observed by ultrasonic measurement on the pipeline in the regulation system of the hydro power plant Djerdap. Three-dimensional finite element analysis is performed using Simulia Abaqus software package. First, the models with dimensions of the defects observed by non-destructive examination are formed. Stress and strain fields for different loading types are shown and commented. The influence of the defect dimensions on the pipe elbow load-carrying capacity is determined through plastic collapse loads, which are obtained from bending moment - rotation angle diagrams. Twice elastic slope (TES) technique is applied. Additionally, some more severe defects are considered, in the form of sharp pre-cracks at the bottom of the defect; plastic collapse loads are also determined for these geometries. Both opening and closing bending moments are taken into consideration and the results are discussed and compared to two closed-form solutions from the literature. The influence of the boundary conditions applied for examination of the pipe elbows is
commented.
PB  - Faculty of Technology Zvornik, University of East Sarajevo
T2  - Journal of Engineering & Processing Management
T1  - Effect of welded joint imperfection on the load-carrying capacity of pipe elbows subjected to in – plane bending moment
EP  - 28
IS  - 1
SP  - 19
VL  - 13
DO  - 10.7251/JEPM2101019M
ER  - 

@article{
author = "Međo, Bojan and Rakin, Marko and Arsić, Miodrag and Damnjanović, Ivana and Stefanović, Ana and Grabulov, Vencislav",
year = "2021",
abstract = "The defects in pipe elbows can, depending on their size and position, affect the integrity and safe service, as well as deformation ability of the piping systems in exploitation. Incompletely filled groove, which is the type of defect examined here, was observed by ultrasonic measurement on the pipeline in the regulation system of the hydro power plant Djerdap. Three-dimensional finite element analysis is performed using Simulia Abaqus software package. First, the models with dimensions of the defects observed by non-destructive examination are formed. Stress and strain fields for different loading types are shown and commented. The influence of the defect dimensions on the pipe elbow load-carrying capacity is determined through plastic collapse loads, which are obtained from bending moment - rotation angle diagrams. Twice elastic slope (TES) technique is applied. Additionally, some more severe defects are considered, in the form of sharp pre-cracks at the bottom of the defect; plastic collapse loads are also determined for these geometries. Both opening and closing bending moments are taken into consideration and the results are discussed and compared to two closed-form solutions from the literature. The influence of the boundary conditions applied for examination of the pipe elbows is
commented.",
publisher = "Faculty of Technology Zvornik, University of East Sarajevo",
journal = "Journal of Engineering & Processing Management",
title = "Effect of welded joint imperfection on the load-carrying capacity of pipe elbows subjected to in – plane bending moment",
pages = "28-19",
number = "1",
volume = "13",
doi = "10.7251/JEPM2101019M"
}

Međo, B., Rakin, M., Arsić, M., Damnjanović, I., Stefanović, A.,& Grabulov, V.. (2021). Effect of welded joint imperfection on the load-carrying capacity of pipe elbows subjected to in – plane bending moment. in Journal of Engineering & Processing Management
Faculty of Technology Zvornik, University of East Sarajevo., 13(1), 19-28.
https://doi.org/10.7251/JEPM2101019M

Međo B, Rakin M, Arsić M, Damnjanović I, Stefanović A, Grabulov V. Effect of welded joint imperfection on the load-carrying capacity of pipe elbows subjected to in – plane bending moment. in Journal of Engineering & Processing Management. 2021;13(1):19-28.
doi:10.7251/JEPM2101019M .

Međo, Bojan, Rakin, Marko, Arsić, Miodrag, Damnjanović, Ivana, Stefanović, Ana, Grabulov, Vencislav, "Effect of welded joint imperfection on the load-carrying capacity of pipe elbows subjected to in – plane bending moment" in Journal of Engineering & Processing Management, 13, no. 1 (2021):19-28,
https://doi.org/10.7251/JEPM2101019M . .

TY  - JOUR
AU  - Međo, Bojan
AU  - Arsić, Miodrag
AU  - Mladenović, Mladen
AU  - Savić, Zoran
AU  - Grabulov, Vencislav
AU  - Radosavljević, Zoran
AU  - Rakin, Marko
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4567
AB  - Topic of this work is the integrity assessment of the pipeline section from hydropower plant Pirot. Crack-like defect size, maximum depth, is determined based on non-destructive evaluation - the largest crack depth is taken as the initial value for load carrying capacity estimation. Also, the crack dimensions (both length and depth) are varied. Limit pressure values are determined from 3D and 2D models of pipes with axial cracks on external surface. The influence of tensile loading on the load carrying capacity of the pipes with circumferential cracks is also examined. Integrity of pipes with both types of defects (axial and circumferential) is assessed through application of FAD diagrams.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Structural Integrity and Life
T1  - Influence of defects on limit loads and integrity of the pipeline at hydropower plant 'Pirot'
EP  - 86
IS  - 1
SP  - 82
VL  - 20
UR  - https://hdl.handle.net/21.15107/rcub_technorep_4567
ER  - 

@article{
author = "Međo, Bojan and Arsić, Miodrag and Mladenović, Mladen and Savić, Zoran and Grabulov, Vencislav and Radosavljević, Zoran and Rakin, Marko",
year = "2020",
abstract = "Topic of this work is the integrity assessment of the pipeline section from hydropower plant Pirot. Crack-like defect size, maximum depth, is determined based on non-destructive evaluation - the largest crack depth is taken as the initial value for load carrying capacity estimation. Also, the crack dimensions (both length and depth) are varied. Limit pressure values are determined from 3D and 2D models of pipes with axial cracks on external surface. The influence of tensile loading on the load carrying capacity of the pipes with circumferential cracks is also examined. Integrity of pipes with both types of defects (axial and circumferential) is assessed through application of FAD diagrams.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Structural Integrity and Life",
title = "Influence of defects on limit loads and integrity of the pipeline at hydropower plant 'Pirot'",
pages = "86-82",
number = "1",
volume = "20",
url = "https://hdl.handle.net/21.15107/rcub_technorep_4567"
}

Međo, B., Arsić, M., Mladenović, M., Savić, Z., Grabulov, V., Radosavljević, Z.,& Rakin, M.. (2020). Influence of defects on limit loads and integrity of the pipeline at hydropower plant 'Pirot'. in Structural Integrity and Life
Society for Structural Integrity and Life, Institute for Material Testing., 20(1), 82-86.
https://hdl.handle.net/21.15107/rcub_technorep_4567

Međo B, Arsić M, Mladenović M, Savić Z, Grabulov V, Radosavljević Z, Rakin M. Influence of defects on limit loads and integrity of the pipeline at hydropower plant 'Pirot'. in Structural Integrity and Life. 2020;20(1):82-86.
https://hdl.handle.net/21.15107/rcub_technorep_4567 .

Međo, Bojan, Arsić, Miodrag, Mladenović, Mladen, Savić, Zoran, Grabulov, Vencislav, Radosavljević, Zoran, Rakin, Marko, "Influence of defects on limit loads and integrity of the pipeline at hydropower plant 'Pirot'" in Structural Integrity and Life, 20, no. 1 (2020):82-86,
https://hdl.handle.net/21.15107/rcub_technorep_4567 .

TY  - JOUR
AU  - Radisavljević, Igor
AU  - Živković, Aleksandar
AU  - Radović, Nenad
AU  - Grabulov, Vencislav
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3519
AB  - In this work, the structural and mechanical properties of friction stir welded dissimilar butt joints of AA2024-T351 to AA5083-H112 aluminum alloys were evaluated. Plates of 6 mm thick were friction stir welded with optimized tool. In the first case, plate of AA2024 was positioned on the advancing and plate of AA5083 was on the retreating side of the weld. In second case, position of the plate was opposite. Specimens were welded using rotation rate of 750 rpm and welding speed of 73 and 93 mm/min. Specimens were defect free, with good or acceptable weld surface. The effects of rotation and lateral speed of the welding tool were related to structural features and mechanical properties. The structural appearances of concentric rings in the nugget zone were controlled by tool speed and plate position. Structural analysis of the joint cross-section, revealed the distinct lamellar bands. The joints consistently failed on the AA5083 aluminum alloy plate. Failures were observed through the heat-affected zone at distance of approximately 21 mm from weld center.
AB  - U radu su predstavljeni rezultati strukturnih i mehaničkih ispitivanja sučeonih spojeva raznorodnih aluminijumskih legura AlCu4,5Mg (AA2024) i AlMg4,5Mn (AA5083) zavarenih postupkom FSW. Primenom optimizovang alata za zavarivanje, spojene su ploče debljine 6 mm. Međusobni položaj ploča u spoju je variran tako da je u prvom slučaju ploča od AA2024 pozicionirana na strani napredovanja a ploča od AA5083 na povratnoj strani spoja. U drugom slučaju položaj ploča je bio obrnut. Korišćeni su sledeći parametri zavarivanja: brzina rotacije alata nije menjana i iznosila je 750 obr/min a brzina zavarivanja iznosila je 73 i 93 mm/min. Dobijeni su spojevi bez prisustva grešaka i sa glatkom odnosno prihvatljivo ravnom površinom spoja. Analiziran je uticaj parametra zavarivanja na dobijenu strukturu i mehanička svojstva spoja. Oblik grumena i u njemu prisutnih koncentričnih krugova, zavisi od brzine zavarivanja i položaja ploča u spoju. Do loma uvek dolazi na strani spoja gde je pozicionirana ploča od legure AA5083. Karakteristično je da se lom uvek dešava na rastojanju od oko 21 mm od centra spoja.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Mechanical and structural properties of friction stir weld of dissimilar aluminum alloys
T1  - Mehahička i strukturna svojstva spojeva od raznorodnih aluminijumskih legura zavarenih FSW postupkom
EP  - 18
IS  - 1
SP  - 11
VL  - 62
DO  - 10.5937/zzk1701011R
ER  - 

@article{
author = "Radisavljević, Igor and Živković, Aleksandar and Radović, Nenad and Grabulov, Vencislav",
year = "2017",
abstract = "In this work, the structural and mechanical properties of friction stir welded dissimilar butt joints of AA2024-T351 to AA5083-H112 aluminum alloys were evaluated. Plates of 6 mm thick were friction stir welded with optimized tool. In the first case, plate of AA2024 was positioned on the advancing and plate of AA5083 was on the retreating side of the weld. In second case, position of the plate was opposite. Specimens were welded using rotation rate of 750 rpm and welding speed of 73 and 93 mm/min. Specimens were defect free, with good or acceptable weld surface. The effects of rotation and lateral speed of the welding tool were related to structural features and mechanical properties. The structural appearances of concentric rings in the nugget zone were controlled by tool speed and plate position. Structural analysis of the joint cross-section, revealed the distinct lamellar bands. The joints consistently failed on the AA5083 aluminum alloy plate. Failures were observed through the heat-affected zone at distance of approximately 21 mm from weld center., U radu su predstavljeni rezultati strukturnih i mehaničkih ispitivanja sučeonih spojeva raznorodnih aluminijumskih legura AlCu4,5Mg (AA2024) i AlMg4,5Mn (AA5083) zavarenih postupkom FSW. Primenom optimizovang alata za zavarivanje, spojene su ploče debljine 6 mm. Međusobni položaj ploča u spoju je variran tako da je u prvom slučaju ploča od AA2024 pozicionirana na strani napredovanja a ploča od AA5083 na povratnoj strani spoja. U drugom slučaju položaj ploča je bio obrnut. Korišćeni su sledeći parametri zavarivanja: brzina rotacije alata nije menjana i iznosila je 750 obr/min a brzina zavarivanja iznosila je 73 i 93 mm/min. Dobijeni su spojevi bez prisustva grešaka i sa glatkom odnosno prihvatljivo ravnom površinom spoja. Analiziran je uticaj parametra zavarivanja na dobijenu strukturu i mehanička svojstva spoja. Oblik grumena i u njemu prisutnih koncentričnih krugova, zavisi od brzine zavarivanja i položaja ploča u spoju. Do loma uvek dolazi na strani spoja gde je pozicionirana ploča od legure AA5083. Karakteristično je da se lom uvek dešava na rastojanju od oko 21 mm od centra spoja.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Mechanical and structural properties of friction stir weld of dissimilar aluminum alloys, Mehahička i strukturna svojstva spojeva od raznorodnih aluminijumskih legura zavarenih FSW postupkom",
pages = "18-11",
number = "1",
volume = "62",
doi = "10.5937/zzk1701011R"
}

Radisavljević, I., Živković, A., Radović, N.,& Grabulov, V.. (2017). Mechanical and structural properties of friction stir weld of dissimilar aluminum alloys. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 62(1), 11-18.
https://doi.org/10.5937/zzk1701011R

Radisavljević I, Živković A, Radović N, Grabulov V. Mechanical and structural properties of friction stir weld of dissimilar aluminum alloys. in Zavarivanje i zavarene konstrukcije. 2017;62(1):11-18.
doi:10.5937/zzk1701011R .

Radisavljević, Igor, Živković, Aleksandar, Radović, Nenad, Grabulov, Vencislav, "Mechanical and structural properties of friction stir weld of dissimilar aluminum alloys" in Zavarivanje i zavarene konstrukcije, 62, no. 1 (2017):11-18,
https://doi.org/10.5937/zzk1701011R . .

TY  - JOUR
AU  - Radisavljević, Igor
AU  - Živković, Aleksandar
AU  - Grabulov, Vencislav
AU  - Radović, Nenad
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2894
AB  - The aim of this work was to investigate the combined effect of small difference in pin geometry, together with rotation and welding speed on the weldability, mechanical and structural properties of FSW 2024-T351 Al plates. The only difference in tool pin design was the shape of thread: regular and rounded. Specimens were welded using rotation rate of 750 rev/min and welding speeds of 73 and 93 mm/min. Specimens were defect free, with good or acceptable weld surface, in all four cases. Modification in pin design showed strong influence on macro structure and hardness distribution. Weak places are identified as low hardness zone, close to the nugget zone and are in good agreement with fracture location in tensile testing. Weld efficiency, as a measure of weld quality, is better in case of 310 tool, while UTS values can differ up to 13% for the equal welding parameters. Therefore, it can be assumed that small modification in tool design, particularly in pin geometry, can have great influence on weld formation and mechanical properties.
AB  - U radu je ispitivano kakav zajednički, kombinovani uticaj brzina rotacije alata, brzina zavarivanja i mala promena u geometriji trna alata imaju na zavarljivost, mehaničke i strukturne karakteristike sučeonog spoja Al legure 2024-T351 zavarene primenom FSW (zavarivanje trenjem alatom) postupka zavarivanja. Zavarivane su ploče dimenzija 260 mm×65 mm×6 mm. Ploče su pre zavarivanja mašinski obrađene i kruto stegnute za potpornu ploču. Zavarivanje je izvedeno u pravcu valjanja ploča, na alatnoj glodalici prilagođenoj postupku FSW. Dužina svakog zavarenog spoja iznosila je oko 210 mm. Korišćena su dva alata sa veoma slično profilisanim trnovima. Razlika u dizajnu trna alata je u obliku zavojnice, normalna (klasična) kod alata oznake 310 odnosno zaobljena za alat 310-O. Zavarivanje je izvedeno pri brzini rotacije alata od 750 o/min i brzinama zavarivanja 73 i 93 mm/min. Ukupno su zavarene četiri kombinacije spojeva. U svim slučajevima dobijen je zavareni spoj bez prisustva grešaka, sa glatkom odnosno delimično hrapavom površinom zavara. Prisutne su tri različite oblasti u spoju - grumen, zona termomehaničkog uticaja i zona uticaja toplote. Promene u dizajnu trna alata imaju znatnog uticaja na makrostrukturu spoja i raspodelu tvrdoće kroz spoj. Mapiranjem spoja, na osnovu raspodele tvrdoće, određene su oblasti sa najnižim vrednostima tvrdoće a nalaze se u neposrednoj blizini grumena, tačnije na liniji dodira grumena i zone termomehaničkog uticaja. Položaj oblasti najmanje tvrdoće je u saglasnosti sa mestom preloma zateznih epruveta. Efikasnost spoja, kao ocena kvaliteta spoja, je veća kod spojeva zavarenih alatom 310. U zavisnosti od alata, pri istim parametrima zavarivanja dobijene su različite vrednosti zateznih čvrstoća a razlika iznosi do 13%. Pokazano je da mala modifikacija u dizajnu trna alata ima velikog uticaja na formiranje spoja i njegove mehaničke karakteristike.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Influence of pin geometry on mechanical and structural properties of butt friction stir welded 2024-T351 aluminum alloy
T1  - Uticaj geometrije trna alata na mehaničke i strukturne karakteristike sučeonog spoja aluminijumske legure 2024-T351 zavarenog postupkom FSW
EP  - 330
IS  - 3
SP  - 323
VL  - 69
DO  - 10.2298/HEMIND131206020R
ER  - 

@article{
author = "Radisavljević, Igor and Živković, Aleksandar and Grabulov, Vencislav and Radović, Nenad",
year = "2015",
abstract = "The aim of this work was to investigate the combined effect of small difference in pin geometry, together with rotation and welding speed on the weldability, mechanical and structural properties of FSW 2024-T351 Al plates. The only difference in tool pin design was the shape of thread: regular and rounded. Specimens were welded using rotation rate of 750 rev/min and welding speeds of 73 and 93 mm/min. Specimens were defect free, with good or acceptable weld surface, in all four cases. Modification in pin design showed strong influence on macro structure and hardness distribution. Weak places are identified as low hardness zone, close to the nugget zone and are in good agreement with fracture location in tensile testing. Weld efficiency, as a measure of weld quality, is better in case of 310 tool, while UTS values can differ up to 13% for the equal welding parameters. Therefore, it can be assumed that small modification in tool design, particularly in pin geometry, can have great influence on weld formation and mechanical properties., U radu je ispitivano kakav zajednički, kombinovani uticaj brzina rotacije alata, brzina zavarivanja i mala promena u geometriji trna alata imaju na zavarljivost, mehaničke i strukturne karakteristike sučeonog spoja Al legure 2024-T351 zavarene primenom FSW (zavarivanje trenjem alatom) postupka zavarivanja. Zavarivane su ploče dimenzija 260 mm×65 mm×6 mm. Ploče su pre zavarivanja mašinski obrađene i kruto stegnute za potpornu ploču. Zavarivanje je izvedeno u pravcu valjanja ploča, na alatnoj glodalici prilagođenoj postupku FSW. Dužina svakog zavarenog spoja iznosila je oko 210 mm. Korišćena su dva alata sa veoma slično profilisanim trnovima. Razlika u dizajnu trna alata je u obliku zavojnice, normalna (klasična) kod alata oznake 310 odnosno zaobljena za alat 310-O. Zavarivanje je izvedeno pri brzini rotacije alata od 750 o/min i brzinama zavarivanja 73 i 93 mm/min. Ukupno su zavarene četiri kombinacije spojeva. U svim slučajevima dobijen je zavareni spoj bez prisustva grešaka, sa glatkom odnosno delimično hrapavom površinom zavara. Prisutne su tri različite oblasti u spoju - grumen, zona termomehaničkog uticaja i zona uticaja toplote. Promene u dizajnu trna alata imaju znatnog uticaja na makrostrukturu spoja i raspodelu tvrdoće kroz spoj. Mapiranjem spoja, na osnovu raspodele tvrdoće, određene su oblasti sa najnižim vrednostima tvrdoće a nalaze se u neposrednoj blizini grumena, tačnije na liniji dodira grumena i zone termomehaničkog uticaja. Položaj oblasti najmanje tvrdoće je u saglasnosti sa mestom preloma zateznih epruveta. Efikasnost spoja, kao ocena kvaliteta spoja, je veća kod spojeva zavarenih alatom 310. U zavisnosti od alata, pri istim parametrima zavarivanja dobijene su različite vrednosti zateznih čvrstoća a razlika iznosi do 13%. Pokazano je da mala modifikacija u dizajnu trna alata ima velikog uticaja na formiranje spoja i njegove mehaničke karakteristike.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Influence of pin geometry on mechanical and structural properties of butt friction stir welded 2024-T351 aluminum alloy, Uticaj geometrije trna alata na mehaničke i strukturne karakteristike sučeonog spoja aluminijumske legure 2024-T351 zavarenog postupkom FSW",
pages = "330-323",
number = "3",
volume = "69",
doi = "10.2298/HEMIND131206020R"
}

Radisavljević, I., Živković, A., Grabulov, V.,& Radović, N.. (2015). Influence of pin geometry on mechanical and structural properties of butt friction stir welded 2024-T351 aluminum alloy. in Hemijska industrija
Association of Chemical Engineers of Serbia., 69(3), 323-330.
https://doi.org/10.2298/HEMIND131206020R

Radisavljević I, Živković A, Grabulov V, Radović N. Influence of pin geometry on mechanical and structural properties of butt friction stir welded 2024-T351 aluminum alloy. in Hemijska industrija. 2015;69(3):323-330.
doi:10.2298/HEMIND131206020R .

Radisavljević, Igor, Živković, Aleksandar, Grabulov, Vencislav, Radović, Nenad, "Influence of pin geometry on mechanical and structural properties of butt friction stir welded 2024-T351 aluminum alloy" in Hemijska industrija, 69, no. 3 (2015):323-330,
https://doi.org/10.2298/HEMIND131206020R . .

TY  - JOUR
AU  - Veljić, Darko
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Bajić, Nikola
AU  - Međo, Bojan
AU  - Bajić, Darko
AU  - Grabulov, Vencislav
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2678
AB  - This paper presents experimental and numerical analysis of the change of temperature and force in the vertical direction during the friction stir welding of high-strength aluminium alloy 2024 T3. This procedure confirmed the correctness of the numerical model, which is subsequently used for analysis of the temperature field in the welding zone, where it is different to determine the temperature experimentally. 3D finite element model is developed using the software package Abaqus; arbitrary Lagrangian-Eulerian formulation is applied. Johnson-Cook material law and Coulomb's Law of friction are used for modelling the material behaviour. Temperature fields are symmetrical with respect to the welding line. The temperature values below the tool shoulder, i.e. in the welding zone, which are reached during the plunge stage, are approximately constant during the entire welding process and lie within the interval 430-502 degrees C. The temperature of the material in the vicinity of the tool is about 500 degrees C, while the values on the top surface of the welding plates (outside the welding zone, but close to the tool shoulder) are about 400 degrees C. The temperature difference between the top and bottom surface of the plates is small, 10-15 degrees C.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Experimental and numerical thermo - mechanical analysis of friction stir welding of high - strength alluminium alloy
EP  - S38
SP  - S29
VL  - 18
DO  - 10.2298/TSCI130512171V
ER  - 

@article{
author = "Veljić, Darko and Sedmak, Aleksandar and Rakin, Marko and Bajić, Nikola and Međo, Bojan and Bajić, Darko and Grabulov, Vencislav",
year = "2014",
abstract = "This paper presents experimental and numerical analysis of the change of temperature and force in the vertical direction during the friction stir welding of high-strength aluminium alloy 2024 T3. This procedure confirmed the correctness of the numerical model, which is subsequently used for analysis of the temperature field in the welding zone, where it is different to determine the temperature experimentally. 3D finite element model is developed using the software package Abaqus; arbitrary Lagrangian-Eulerian formulation is applied. Johnson-Cook material law and Coulomb's Law of friction are used for modelling the material behaviour. Temperature fields are symmetrical with respect to the welding line. The temperature values below the tool shoulder, i.e. in the welding zone, which are reached during the plunge stage, are approximately constant during the entire welding process and lie within the interval 430-502 degrees C. The temperature of the material in the vicinity of the tool is about 500 degrees C, while the values on the top surface of the welding plates (outside the welding zone, but close to the tool shoulder) are about 400 degrees C. The temperature difference between the top and bottom surface of the plates is small, 10-15 degrees C.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Experimental and numerical thermo - mechanical analysis of friction stir welding of high - strength alluminium alloy",
pages = "S38-S29",
volume = "18",
doi = "10.2298/TSCI130512171V"
}

Veljić, D., Sedmak, A., Rakin, M., Bajić, N., Međo, B., Bajić, D.,& Grabulov, V.. (2014). Experimental and numerical thermo - mechanical analysis of friction stir welding of high - strength alluminium alloy. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 18, S29-S38.
https://doi.org/10.2298/TSCI130512171V

Veljić D, Sedmak A, Rakin M, Bajić N, Međo B, Bajić D, Grabulov V. Experimental and numerical thermo - mechanical analysis of friction stir welding of high - strength alluminium alloy. in Thermal Science. 2014;18:S29-S38.
doi:10.2298/TSCI130512171V .

Veljić, Darko, Sedmak, Aleksandar, Rakin, Marko, Bajić, Nikola, Međo, Bojan, Bajić, Darko, Grabulov, Vencislav, "Experimental and numerical thermo - mechanical analysis of friction stir welding of high - strength alluminium alloy" in Thermal Science, 18 (2014):S29-S38,
https://doi.org/10.2298/TSCI130512171V . .

TY  - JOUR
AU  - Radisavljević, Igor
AU  - Živković, Aleksandar
AU  - Radović, Nenad
AU  - Grabulov, Vencislav
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2496
AB  - The influence of R/v ratio on joint quality in 2024-T351 aluminum alloy was studied. Specimens were subjected to friction stir welding with the rotation rates of 750, 950 and 1180 r/min and welding speed between 73 and 190 mm/min, providing R/v ratio between 5.00 and 10.27. The welded joints were tested by means of both non-destructive (visual, penetrant and X-ray inspection) and destructive (metallographic, tension and hardness) testing. In all specimens typical zones are revealed, with corresponding differences in grain size. Tensile efficiency of the joints obtained is in the range of 52.2% to 82.3%. The results show that the best quality is obtained at R/v ratio of 8.06, 10.17 and 10.27. This behavior is attributed to the assumption that the material flows around the pin with an optimal speed, i.e. sufficient amount of material is available to fill the gap and prevent tunnel formation. R/v ratio also showed influence on hardness distribution, onion features and crack initiation/propagation zones.
PB  - Elsevier, Amsterdam
T2  - Transactions of Nonferrous Metals Society of China
T1  - Influence of FSW parameters on formation quality and mechanical properties of Al 2024-T351 butt welded joints
EP  - 3539
IS  - 12
SP  - 3525
VL  - 23
DO  - 10.1016/S1003-6326(13)62897-6
ER  - 

@article{
author = "Radisavljević, Igor and Živković, Aleksandar and Radović, Nenad and Grabulov, Vencislav",
year = "2013",
abstract = "The influence of R/v ratio on joint quality in 2024-T351 aluminum alloy was studied. Specimens were subjected to friction stir welding with the rotation rates of 750, 950 and 1180 r/min and welding speed between 73 and 190 mm/min, providing R/v ratio between 5.00 and 10.27. The welded joints were tested by means of both non-destructive (visual, penetrant and X-ray inspection) and destructive (metallographic, tension and hardness) testing. In all specimens typical zones are revealed, with corresponding differences in grain size. Tensile efficiency of the joints obtained is in the range of 52.2% to 82.3%. The results show that the best quality is obtained at R/v ratio of 8.06, 10.17 and 10.27. This behavior is attributed to the assumption that the material flows around the pin with an optimal speed, i.e. sufficient amount of material is available to fill the gap and prevent tunnel formation. R/v ratio also showed influence on hardness distribution, onion features and crack initiation/propagation zones.",
publisher = "Elsevier, Amsterdam",
journal = "Transactions of Nonferrous Metals Society of China",
title = "Influence of FSW parameters on formation quality and mechanical properties of Al 2024-T351 butt welded joints",
pages = "3539-3525",
number = "12",
volume = "23",
doi = "10.1016/S1003-6326(13)62897-6"
}

Radisavljević, I., Živković, A., Radović, N.,& Grabulov, V.. (2013). Influence of FSW parameters on formation quality and mechanical properties of Al 2024-T351 butt welded joints. in Transactions of Nonferrous Metals Society of China
Elsevier, Amsterdam., 23(12), 3525-3539.
https://doi.org/10.1016/S1003-6326(13)62897-6

Radisavljević I, Živković A, Radović N, Grabulov V. Influence of FSW parameters on formation quality and mechanical properties of Al 2024-T351 butt welded joints. in Transactions of Nonferrous Metals Society of China. 2013;23(12):3525-3539.
doi:10.1016/S1003-6326(13)62897-6 .

Radisavljević, Igor, Živković, Aleksandar, Radović, Nenad, Grabulov, Vencislav, "Influence of FSW parameters on formation quality and mechanical properties of Al 2024-T351 butt welded joints" in Transactions of Nonferrous Metals Society of China, 23, no. 12 (2013):3525-3539,
https://doi.org/10.1016/S1003-6326(13)62897-6 . .

TY  - JOUR
AU  - Dimić, Ivana
AU  - Arsić, Miodrag
AU  - Međo, Bojan
AU  - Stefanović, Ana
AU  - Grabulov, Vencislav
AU  - Rakin, Marko
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2515
AB  - Since local defects reduce the load-carrying capacity and deformation ability of a piping system, an analysis is undertaken to quantify the influence of weld defects on integrity of the pipe elbows subjected to internal pressure. Incompletely filled groove is examined, because this type of defect was previously detected by ultrasonic measurement on the inner surface of the pipeline from a hydro-power plant. Three-dimensional finite element analysis is conducted using Abaqus software package. The influence of weld defect geometry (its depth, length and location) on the elbow integrity is determined. Additionally, decrease of load carrying capacity is determined for the case when a crack has initiated at the bottom of the defect. The influence of finite element type (hexahedral or tetrahedral) is examined.
PB  - University of Osijek, Tech Fac, Slavonski Brod
T2  - Tehnicki vjesnik-Technical Gazette
T1  - Effect of welded joint imperfection on the integrity of pipe elbows subjected to internal pressure
EP  - 290
IS  - 2
SP  - 285
VL  - 20
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2515
ER  - 

@article{
author = "Dimić, Ivana and Arsić, Miodrag and Međo, Bojan and Stefanović, Ana and Grabulov, Vencislav and Rakin, Marko",
year = "2013",
abstract = "Since local defects reduce the load-carrying capacity and deformation ability of a piping system, an analysis is undertaken to quantify the influence of weld defects on integrity of the pipe elbows subjected to internal pressure. Incompletely filled groove is examined, because this type of defect was previously detected by ultrasonic measurement on the inner surface of the pipeline from a hydro-power plant. Three-dimensional finite element analysis is conducted using Abaqus software package. The influence of weld defect geometry (its depth, length and location) on the elbow integrity is determined. Additionally, decrease of load carrying capacity is determined for the case when a crack has initiated at the bottom of the defect. The influence of finite element type (hexahedral or tetrahedral) is examined.",
publisher = "University of Osijek, Tech Fac, Slavonski Brod",
journal = "Tehnicki vjesnik-Technical Gazette",
title = "Effect of welded joint imperfection on the integrity of pipe elbows subjected to internal pressure",
pages = "290-285",
number = "2",
volume = "20",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2515"
}

Dimić, I., Arsić, M., Međo, B., Stefanović, A., Grabulov, V.,& Rakin, M.. (2013). Effect of welded joint imperfection on the integrity of pipe elbows subjected to internal pressure. in Tehnicki vjesnik-Technical Gazette
University of Osijek, Tech Fac, Slavonski Brod., 20(2), 285-290.
https://hdl.handle.net/21.15107/rcub_technorep_2515

Dimić I, Arsić M, Međo B, Stefanović A, Grabulov V, Rakin M. Effect of welded joint imperfection on the integrity of pipe elbows subjected to internal pressure. in Tehnicki vjesnik-Technical Gazette. 2013;20(2):285-290.
https://hdl.handle.net/21.15107/rcub_technorep_2515 .

Dimić, Ivana, Arsić, Miodrag, Međo, Bojan, Stefanović, Ana, Grabulov, Vencislav, Rakin, Marko, "Effect of welded joint imperfection on the integrity of pipe elbows subjected to internal pressure" in Tehnicki vjesnik-Technical Gazette, 20, no. 2 (2013):285-290,
https://hdl.handle.net/21.15107/rcub_technorep_2515 .

TY  - JOUR
AU  - Sadibašić, Damir
AU  - Radović, Nenad
AU  - Grabulov, Vencislav
AU  - Zrilić, Milorad
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2038
AB  - The aim of this work was to establish the influence of initial state of base metal on properties of mma welded 14MoV 6 3 steel. Three combinations of specimens were welded: (i) virgin-virgin (N-N); (ii) used-used (S-S); (iii) virgin-used (N-S). Used specimens were 52000 hours in exploitation. It has been established that the fracture is initiated in the zone of used part. It is assumed that the critical conditions were achieved as the consequence of creep induced grain growth and particle coarsening. On the other hand, testing of unused specimens revealed the highest level of strength.
AB  - U radu je ispitan uticaj stanja osnovnog metala na osobine REL zavarenog spoja čelika 14MoV 6 3. Zavarene su tri kombinacije uzoraka: (i) nekorišćen; (ii) korišćen-korišćen; i (iii) korišćen nekorišćen. Korišćeni uzorci su bili u upotrebi preko 52000 sati. Utvrđeno je da do loma dolazi uvek u osnovnom metalu korišćenog uzorka. Pretpostavljeno je da kritični uslovi nastaju usled puzanjem izazvanog rasta zrna i/ili taloga. Najviši nivo zatezne čvrstoće je u kombinaciji dva nekorišćena uzorka.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Influence of initial state on properties of mma welded 14mov 6 3 steel
T1  - Uticaj polaznog stanja na osobine REL zavarenog spoja čelika 14mov 6 3
EP  - 60
IS  - 2
SP  - 53
VL  - 57
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2038
ER  - 

@article{
author = "Sadibašić, Damir and Radović, Nenad and Grabulov, Vencislav and Zrilić, Milorad",
year = "2012",
abstract = "The aim of this work was to establish the influence of initial state of base metal on properties of mma welded 14MoV 6 3 steel. Three combinations of specimens were welded: (i) virgin-virgin (N-N); (ii) used-used (S-S); (iii) virgin-used (N-S). Used specimens were 52000 hours in exploitation. It has been established that the fracture is initiated in the zone of used part. It is assumed that the critical conditions were achieved as the consequence of creep induced grain growth and particle coarsening. On the other hand, testing of unused specimens revealed the highest level of strength., U radu je ispitan uticaj stanja osnovnog metala na osobine REL zavarenog spoja čelika 14MoV 6 3. Zavarene su tri kombinacije uzoraka: (i) nekorišćen; (ii) korišćen-korišćen; i (iii) korišćen nekorišćen. Korišćeni uzorci su bili u upotrebi preko 52000 sati. Utvrđeno je da do loma dolazi uvek u osnovnom metalu korišćenog uzorka. Pretpostavljeno je da kritični uslovi nastaju usled puzanjem izazvanog rasta zrna i/ili taloga. Najviši nivo zatezne čvrstoće je u kombinaciji dva nekorišćena uzorka.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Influence of initial state on properties of mma welded 14mov 6 3 steel, Uticaj polaznog stanja na osobine REL zavarenog spoja čelika 14mov 6 3",
pages = "60-53",
number = "2",
volume = "57",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2038"
}

Sadibašić, D., Radović, N., Grabulov, V.,& Zrilić, M.. (2012). Influence of initial state on properties of mma welded 14mov 6 3 steel. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 57(2), 53-60.
https://hdl.handle.net/21.15107/rcub_technorep_2038

Sadibašić D, Radović N, Grabulov V, Zrilić M. Influence of initial state on properties of mma welded 14mov 6 3 steel. in Zavarivanje i zavarene konstrukcije. 2012;57(2):53-60.
https://hdl.handle.net/21.15107/rcub_technorep_2038 .

Sadibašić, Damir, Radović, Nenad, Grabulov, Vencislav, Zrilić, Milorad, "Influence of initial state on properties of mma welded 14mov 6 3 steel" in Zavarivanje i zavarene konstrukcije, 57, no. 2 (2012):53-60,
https://hdl.handle.net/21.15107/rcub_technorep_2038 .

TY  - JOUR
AU  - Popović, Olivera
AU  - Prokić-Cvetković, Radica
AU  - Sedmak, Aleksandar
AU  - Grabulov, Vencislav
AU  - Burzić, Zijah
AU  - Rakin, Marko
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5584
AB  - In this paper microstructural and mechanical properties of high-carbon steel surface welded layer obtained with self-shielded flux cored wire are presented in standard rails and crossings. The testing results of tensile characteristics, hardness, toughness via instrumented Charpy pendulum, microstructural analysis and fatigue crack growth resistance of all characteristical zones are analyzed in detail, especially from the point of view of interaction between microstructure and properties. The obtained results indicate superior properties of repaired welded layers, which is due to their similarity to the new generation of bainitic steel, i.e., due to the change of microstructure from original pearlitic structure to final bainitic structure. Finally, fatigue crack growth parameters have shown that deposite layer has higher resistance than the crack growth, improving overall reliability of rails and crossings.
PB  - Assoc Mechanical Engineers Technicians Slovenia, Ljubljana
T2  - Strojniski Vestnik-Journal of Mechanical Engineering
T1  - Characterisation of High-Carbon Steel Surface Welded Layer
EP  - 300
IS  - 5
SP  - 295
VL  - 56
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1103
ER  - 

@article{
author = "Popović, Olivera and Prokić-Cvetković, Radica and Sedmak, Aleksandar and Grabulov, Vencislav and Burzić, Zijah and Rakin, Marko",
year = "2010",
abstract = "In this paper microstructural and mechanical properties of high-carbon steel surface welded layer obtained with self-shielded flux cored wire are presented in standard rails and crossings. The testing results of tensile characteristics, hardness, toughness via instrumented Charpy pendulum, microstructural analysis and fatigue crack growth resistance of all characteristical zones are analyzed in detail, especially from the point of view of interaction between microstructure and properties. The obtained results indicate superior properties of repaired welded layers, which is due to their similarity to the new generation of bainitic steel, i.e., due to the change of microstructure from original pearlitic structure to final bainitic structure. Finally, fatigue crack growth parameters have shown that deposite layer has higher resistance than the crack growth, improving overall reliability of rails and crossings.",
publisher = "Assoc Mechanical Engineers Technicians Slovenia, Ljubljana",
journal = "Strojniski Vestnik-Journal of Mechanical Engineering",
title = "Characterisation of High-Carbon Steel Surface Welded Layer",
pages = "300-295",
number = "5",
volume = "56",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1103"
}

Popović, O., Prokić-Cvetković, R., Sedmak, A., Grabulov, V., Burzić, Z.,& Rakin, M.. (2010). Characterisation of High-Carbon Steel Surface Welded Layer. in Strojniski Vestnik-Journal of Mechanical Engineering
Assoc Mechanical Engineers Technicians Slovenia, Ljubljana., 56(5), 295-300.
https://hdl.handle.net/21.15107/rcub_machinery_1103

Popović O, Prokić-Cvetković R, Sedmak A, Grabulov V, Burzić Z, Rakin M. Characterisation of High-Carbon Steel Surface Welded Layer. in Strojniski Vestnik-Journal of Mechanical Engineering. 2010;56(5):295-300.
https://hdl.handle.net/21.15107/rcub_machinery_1103 .

Popović, Olivera, Prokić-Cvetković, Radica, Sedmak, Aleksandar, Grabulov, Vencislav, Burzić, Zijah, Rakin, Marko, "Characterisation of High-Carbon Steel Surface Welded Layer" in Strojniski Vestnik-Journal of Mechanical Engineering, 56, no. 5 (2010):295-300,
https://hdl.handle.net/21.15107/rcub_machinery_1103 .

TY  - JOUR
AU  - Zrilić, Milorad
AU  - Rakin, Marko
AU  - Milović, Ljubica
AU  - Burzić, Zijah
AU  - Grabulov, Vencislav
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1038
AB  - Results of the experimental and numerical comparative analysis of steamline pipes have been presented. New pipes and the pipes used for more than 117,000 hours at 540 degrees C under pressure of 42 bars have been simultaneously tested. This testing has been carried out because frequent failures of the equipment components exposed to elevated temperatures, Such as steam pipelines, make it necessary to pay particular attention to the analysis of the materials used. The most frequent failures were those connected with occurrence of cracks, particularly expressed in case of steel 14MoV6 3. Local approach to fracture has been developed for complete understanding of fracture mechanism. This approach combines theoretical, experimental and numerical solutions.
PB  - Croatian Metallurgical Society
T2  - Metalurgija
T1  - Experimental and numerical evaluation of a steamline behaviour using local approach
EP  - 92
IS  - 2
SP  - 87
VL  - 46
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1038
ER  - 

@article{
author = "Zrilić, Milorad and Rakin, Marko and Milović, Ljubica and Burzić, Zijah and Grabulov, Vencislav",
year = "2007",
abstract = "Results of the experimental and numerical comparative analysis of steamline pipes have been presented. New pipes and the pipes used for more than 117,000 hours at 540 degrees C under pressure of 42 bars have been simultaneously tested. This testing has been carried out because frequent failures of the equipment components exposed to elevated temperatures, Such as steam pipelines, make it necessary to pay particular attention to the analysis of the materials used. The most frequent failures were those connected with occurrence of cracks, particularly expressed in case of steel 14MoV6 3. Local approach to fracture has been developed for complete understanding of fracture mechanism. This approach combines theoretical, experimental and numerical solutions.",
publisher = "Croatian Metallurgical Society",
journal = "Metalurgija",
title = "Experimental and numerical evaluation of a steamline behaviour using local approach",
pages = "92-87",
number = "2",
volume = "46",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1038"
}

Zrilić, M., Rakin, M., Milović, L., Burzić, Z.,& Grabulov, V.. (2007). Experimental and numerical evaluation of a steamline behaviour using local approach. in Metalurgija
Croatian Metallurgical Society., 46(2), 87-92.
https://hdl.handle.net/21.15107/rcub_technorep_1038

Zrilić M, Rakin M, Milović L, Burzić Z, Grabulov V. Experimental and numerical evaluation of a steamline behaviour using local approach. in Metalurgija. 2007;46(2):87-92.
https://hdl.handle.net/21.15107/rcub_technorep_1038 .

Zrilić, Milorad, Rakin, Marko, Milović, Ljubica, Burzić, Zijah, Grabulov, Vencislav, "Experimental and numerical evaluation of a steamline behaviour using local approach" in Metalurgija, 46, no. 2 (2007):87-92,
https://hdl.handle.net/21.15107/rcub_technorep_1038 .

TY  - JOUR
AU  - Romhanji, Endre
AU  - Grabulov, Vencislav
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1079
AB  - Formability of welded austenitic stainless steel (321 type) - low carbon steel (1010 type) sandwich sheet material was tested. Gas tungsten arc welding (GTAW) and shield metal arc welding (SMAW) procedures were used. After applying the GTAW welding process the weld metal hardness was found considerably higher than after using the SMAW process, due to a higher consumable fraction in case of the GTAW welding procedure. The bendability of the tested weldments appeared to be satisfying, but the biaxial stretch ability of the welded sandwich sheets was considerably lower compared to the base material (33% - 45% degradation). The stretch ability degradation brought by welding was found the lowest in the samples welded by the lowest heat energy input. The strain distribution after equibiaxial stretching of the welded sheets was very inhomogeneous due to different hardening abilities of the base and weld metal.
AB  - U radu su prikazani rezultati ispitivanja deformacionog ponašanja zavarenih spojeva platiranih (sendvič) limova nerđajućeg čelika (klase 321) niskougljeničnog čelika (klase 1010). Zavarivnje je obavljeno u atmosferi inertnog zaštitnog gasa netopivom volframovom elektrodom (TIG postupak) i ručnoelektrolučnim postupkom bazično obloženom elektrodom (REL postupak).Tvrdoća metala šava kod spojeva zavarenih TIG postupkom je značajno veća nego tvrdoća metala šava kod spojeva zavarenih REL postupkom zbog većeg udela dodatnog materijala u metalu šava. Savojne karakteristike zavarenih spojeva mogu se smatrati zadovoljavajući, ali rezultati dvoosnog razvlačenja zavarenih spojeva su značajno niži u odnosu na osnovni materijal (33%-45% niže vrednosti). Najmanji pad sposobnosti za razvlačenje je dobijen kod spojeva zavarenih uz najmanji unos toplote. Raspodela deformacija posle razvlačenja zavarenih spojeva je nehomogena zbog razlike u mogućnostima za ojačavanje osnovnog materijala i metala šava.
PB  - Military Technical Institute, Belgrade
T2  - Scientific Technical Review
T1  - Deformation behaviour of welded stainless steel: Carbon steel sandwich sheet material
T1  - Deformaciono ponašanje zavarenog spoja sendvič lima nerđajući čelik - ugljenični čelik - nerđajući čelik
EP  - 7
IS  - 2
SP  - 3
VL  - 57
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1079
ER  - 

@article{
author = "Romhanji, Endre and Grabulov, Vencislav",
year = "2007",
abstract = "Formability of welded austenitic stainless steel (321 type) - low carbon steel (1010 type) sandwich sheet material was tested. Gas tungsten arc welding (GTAW) and shield metal arc welding (SMAW) procedures were used. After applying the GTAW welding process the weld metal hardness was found considerably higher than after using the SMAW process, due to a higher consumable fraction in case of the GTAW welding procedure. The bendability of the tested weldments appeared to be satisfying, but the biaxial stretch ability of the welded sandwich sheets was considerably lower compared to the base material (33% - 45% degradation). The stretch ability degradation brought by welding was found the lowest in the samples welded by the lowest heat energy input. The strain distribution after equibiaxial stretching of the welded sheets was very inhomogeneous due to different hardening abilities of the base and weld metal., U radu su prikazani rezultati ispitivanja deformacionog ponašanja zavarenih spojeva platiranih (sendvič) limova nerđajućeg čelika (klase 321) niskougljeničnog čelika (klase 1010). Zavarivnje je obavljeno u atmosferi inertnog zaštitnog gasa netopivom volframovom elektrodom (TIG postupak) i ručnoelektrolučnim postupkom bazično obloženom elektrodom (REL postupak).Tvrdoća metala šava kod spojeva zavarenih TIG postupkom je značajno veća nego tvrdoća metala šava kod spojeva zavarenih REL postupkom zbog većeg udela dodatnog materijala u metalu šava. Savojne karakteristike zavarenih spojeva mogu se smatrati zadovoljavajući, ali rezultati dvoosnog razvlačenja zavarenih spojeva su značajno niži u odnosu na osnovni materijal (33%-45% niže vrednosti). Najmanji pad sposobnosti za razvlačenje je dobijen kod spojeva zavarenih uz najmanji unos toplote. Raspodela deformacija posle razvlačenja zavarenih spojeva je nehomogena zbog razlike u mogućnostima za ojačavanje osnovnog materijala i metala šava.",
publisher = "Military Technical Institute, Belgrade",
journal = "Scientific Technical Review",
title = "Deformation behaviour of welded stainless steel: Carbon steel sandwich sheet material, Deformaciono ponašanje zavarenog spoja sendvič lima nerđajući čelik - ugljenični čelik - nerđajući čelik",
pages = "7-3",
number = "2",
volume = "57",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1079"
}

Romhanji, E.,& Grabulov, V.. (2007). Deformation behaviour of welded stainless steel: Carbon steel sandwich sheet material. in Scientific Technical Review
Military Technical Institute, Belgrade., 57(2), 3-7.
https://hdl.handle.net/21.15107/rcub_technorep_1079

Romhanji E, Grabulov V. Deformation behaviour of welded stainless steel: Carbon steel sandwich sheet material. in Scientific Technical Review. 2007;57(2):3-7.
https://hdl.handle.net/21.15107/rcub_technorep_1079 .

Romhanji, Endre, Grabulov, Vencislav, "Deformation behaviour of welded stainless steel: Carbon steel sandwich sheet material" in Scientific Technical Review, 57, no. 2 (2007):3-7,
https://hdl.handle.net/21.15107/rcub_technorep_1079 .

TY  - JOUR
AU  - Ćirić, R.
AU  - Raić, Karlo
AU  - Radović, Nenad
AU  - Grabulov, Vencislav
AU  - Odanović, Zoran
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/730
AB  - Investigation and analysis of the phenomena during rotational friction welding process of the high speed steel M2 (AISI SAE) with quench and tempered carbon steel 1060 (AISI SAE) are presented. Welding parameters as time and friction pressure are varied in experiments. Also different post weld heat treatment (PWHT) regimes, as annealing and quenching are applied. Distribution of the carbon and carbide phases in period of friction during the process of rotation friction welding process and after PWHT and effects on weld quality are analysed. Investigations are performed by the classical and quantitative optical microscopy. Displacement and distribution of carbides in the high speed steel during friction period in viscous layer, than in friction plane and surrounding zones are studied. Results of the quantitative optical microscopy are showed distinct difference of the carbide phase ratio in investigated zones. Obtained results are verified by the EDS analysis of characteristic zones close to the friction plane. Results of the SEM analysis are shown difference in the carbide phase quantity close to the friction plane as a result of the metal flow in viscous layer and in the viscous - plastic zones, with presence of hard carbide particles, and also of the carbide phase dissolution. Beside optical microscopy investigations, effects of the welding parameters and PWHT on carbon and carbide distribution are analysed by the measuring of the micro hardness and mechanical properties which are tested in friction plane. Obtained results have shown direct dependence between welding parameters and applied PWHT on the properties and quality of the friction welded joints.
T2  - Welding in the World
T1  - Analysis of carbon and carbide phases distribution in friction welded joints
EP  - 170
IS  - 9 SPEC. ISS.
SP  - 157
VL  - 49
UR  - https://hdl.handle.net/21.15107/rcub_technorep_730
ER  - 

@article{
author = "Ćirić, R. and Raić, Karlo and Radović, Nenad and Grabulov, Vencislav and Odanović, Zoran",
year = "2005",
abstract = "Investigation and analysis of the phenomena during rotational friction welding process of the high speed steel M2 (AISI SAE) with quench and tempered carbon steel 1060 (AISI SAE) are presented. Welding parameters as time and friction pressure are varied in experiments. Also different post weld heat treatment (PWHT) regimes, as annealing and quenching are applied. Distribution of the carbon and carbide phases in period of friction during the process of rotation friction welding process and after PWHT and effects on weld quality are analysed. Investigations are performed by the classical and quantitative optical microscopy. Displacement and distribution of carbides in the high speed steel during friction period in viscous layer, than in friction plane and surrounding zones are studied. Results of the quantitative optical microscopy are showed distinct difference of the carbide phase ratio in investigated zones. Obtained results are verified by the EDS analysis of characteristic zones close to the friction plane. Results of the SEM analysis are shown difference in the carbide phase quantity close to the friction plane as a result of the metal flow in viscous layer and in the viscous - plastic zones, with presence of hard carbide particles, and also of the carbide phase dissolution. Beside optical microscopy investigations, effects of the welding parameters and PWHT on carbon and carbide distribution are analysed by the measuring of the micro hardness and mechanical properties which are tested in friction plane. Obtained results have shown direct dependence between welding parameters and applied PWHT on the properties and quality of the friction welded joints.",
journal = "Welding in the World",
title = "Analysis of carbon and carbide phases distribution in friction welded joints",
pages = "170-157",
number = "9 SPEC. ISS.",
volume = "49",
url = "https://hdl.handle.net/21.15107/rcub_technorep_730"
}

Ćirić, R., Raić, K., Radović, N., Grabulov, V.,& Odanović, Z.. (2005). Analysis of carbon and carbide phases distribution in friction welded joints. in Welding in the World, 49(9 SPEC. ISS.), 157-170.
https://hdl.handle.net/21.15107/rcub_technorep_730

Ćirić R, Raić K, Radović N, Grabulov V, Odanović Z. Analysis of carbon and carbide phases distribution in friction welded joints. in Welding in the World. 2005;49(9 SPEC. ISS.):157-170.
https://hdl.handle.net/21.15107/rcub_technorep_730 .

Ćirić, R., Raić, Karlo, Radović, Nenad, Grabulov, Vencislav, Odanović, Zoran, "Analysis of carbon and carbide phases distribution in friction welded joints" in Welding in the World, 49, no. 9 SPEC. ISS. (2005):157-170,
https://hdl.handle.net/21.15107/rcub_technorep_730 .

TY  - JOUR
AU  - Rakin, Marko
AU  - Cvijović, Zorica
AU  - Grabulov, Vencislav
AU  - Putić, Slaviša
AU  - Sedmak, Aleksandar
PY  - 2004
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/614
AB  - In the paper ductile fracture initiation analysis of low-alloyed ferritic steel has been made by application of two micromechanical models: the Rice-Tracey void growth model and the Gurson-Tvergaard-Needleman (GTN) model. The aim of the study was to analyse transferability of micromechanical parameters determined on specimens without initial crack to pre-cracked specimens. A significant part of the research has been carried out through participation in the round robin project organised by the European Structural Integrity Society (ESIS). Tensile tests have been performed on cylindrical smooth specimens and CT specimens. Critical values of micromechanical parameters determined on smooth specimen for both applied models, have been used for prediction of the crack growth initiation in CT specimen. Modelling of the first phase of ductile fracture-void nucleation-has been carried out using quantitative metallographic analysis of non-metallic inclusion content in tested steel. For determination of critical values of model parameters corresponding to ductile fracture initiation a simple procedure has been applied based on a combination of experimental and numerical results. Evaluated J-integral values corresponding to onset of crack growth, J(i), are in good agreement with experimental result and both models have proved to be suitable for determination of the ductile fracture initiation in tested steel. The effect of FE size at a crack tip on J(i)-value has been particularly analysed: it has been established that the calculation with FE size corresponding to the mean free path), between inclusions in steel gives results that are in accordance with the experimental ones.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Fracture Mechanics
T1  - Prediction of ductile fracture initiation using micromechanical analysis
EP  - 827
IS  - 4-6
SP  - 813
VL  - 71
DO  - 10.1016/S0013-7944(03)00013-4
ER  - 

@article{
author = "Rakin, Marko and Cvijović, Zorica and Grabulov, Vencislav and Putić, Slaviša and Sedmak, Aleksandar",
year = "2004",
abstract = "In the paper ductile fracture initiation analysis of low-alloyed ferritic steel has been made by application of two micromechanical models: the Rice-Tracey void growth model and the Gurson-Tvergaard-Needleman (GTN) model. The aim of the study was to analyse transferability of micromechanical parameters determined on specimens without initial crack to pre-cracked specimens. A significant part of the research has been carried out through participation in the round robin project organised by the European Structural Integrity Society (ESIS). Tensile tests have been performed on cylindrical smooth specimens and CT specimens. Critical values of micromechanical parameters determined on smooth specimen for both applied models, have been used for prediction of the crack growth initiation in CT specimen. Modelling of the first phase of ductile fracture-void nucleation-has been carried out using quantitative metallographic analysis of non-metallic inclusion content in tested steel. For determination of critical values of model parameters corresponding to ductile fracture initiation a simple procedure has been applied based on a combination of experimental and numerical results. Evaluated J-integral values corresponding to onset of crack growth, J(i), are in good agreement with experimental result and both models have proved to be suitable for determination of the ductile fracture initiation in tested steel. The effect of FE size at a crack tip on J(i)-value has been particularly analysed: it has been established that the calculation with FE size corresponding to the mean free path), between inclusions in steel gives results that are in accordance with the experimental ones.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Fracture Mechanics",
title = "Prediction of ductile fracture initiation using micromechanical analysis",
pages = "827-813",
number = "4-6",
volume = "71",
doi = "10.1016/S0013-7944(03)00013-4"
}

Rakin, M., Cvijović, Z., Grabulov, V., Putić, S.,& Sedmak, A.. (2004). Prediction of ductile fracture initiation using micromechanical analysis. in Engineering Fracture Mechanics
Pergamon-Elsevier Science Ltd, Oxford., 71(4-6), 813-827.
https://doi.org/10.1016/S0013-7944(03)00013-4

Rakin M, Cvijović Z, Grabulov V, Putić S, Sedmak A. Prediction of ductile fracture initiation using micromechanical analysis. in Engineering Fracture Mechanics. 2004;71(4-6):813-827.
doi:10.1016/S0013-7944(03)00013-4 .

Rakin, Marko, Cvijović, Zorica, Grabulov, Vencislav, Putić, Slaviša, Sedmak, Aleksandar, "Prediction of ductile fracture initiation using micromechanical analysis" in Engineering Fracture Mechanics, 71, no. 4-6 (2004):813-827,
https://doi.org/10.1016/S0013-7944(03)00013-4 . .

TY  - JOUR
AU  - Radović, Nenad
AU  - Grabulov, Vencislav
AU  - Smiljanić, Mirjana
AU  - Antić, Milica
PY  - 2003
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/573
AB  - A metallurgical base of alloying in cryogenic steels is presented in this paper. The common use of these steels is for tanks for liquid gases. Main alloying element is Ni, added in amounts between 2.25 and 9 % due to different service temperatures. Selection of welding technology and filler material, together with welding suggestions, are discussed.
AB  - U radu su date fizičko-metalurške osnove legiranja čelika za upotrebu na niskim temperaturama. Ovi čelici se najčešće koriste za izradu rezervoara za skladištenje tečnih gasova. Glavni legirajući element Ni se dodaje u količinama 2.25 do 9%, u zavisnosti od radne temperature. Razmotrena su ograničenja u izboru dodatnih materijala i preporuke za zavarivanje.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Ni alloyed steels for low temperature service
T1  - Čelici legirani niklom za rad na niskim temperaturama
EP  - 20
IS  - 1
SP  - 14
VL  - 48
UR  - https://hdl.handle.net/21.15107/rcub_technorep_573
ER  - 

@article{
author = "Radović, Nenad and Grabulov, Vencislav and Smiljanić, Mirjana and Antić, Milica",
year = "2003",
abstract = "A metallurgical base of alloying in cryogenic steels is presented in this paper. The common use of these steels is for tanks for liquid gases. Main alloying element is Ni, added in amounts between 2.25 and 9 % due to different service temperatures. Selection of welding technology and filler material, together with welding suggestions, are discussed., U radu su date fizičko-metalurške osnove legiranja čelika za upotrebu na niskim temperaturama. Ovi čelici se najčešće koriste za izradu rezervoara za skladištenje tečnih gasova. Glavni legirajući element Ni se dodaje u količinama 2.25 do 9%, u zavisnosti od radne temperature. Razmotrena su ograničenja u izboru dodatnih materijala i preporuke za zavarivanje.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Ni alloyed steels for low temperature service, Čelici legirani niklom za rad na niskim temperaturama",
pages = "20-14",
number = "1",
volume = "48",
url = "https://hdl.handle.net/21.15107/rcub_technorep_573"
}

Radović, N., Grabulov, V., Smiljanić, M.,& Antić, M.. (2003). Ni alloyed steels for low temperature service. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 48(1), 14-20.
https://hdl.handle.net/21.15107/rcub_technorep_573

Radović N, Grabulov V, Smiljanić M, Antić M. Ni alloyed steels for low temperature service. in Zavarivanje i zavarene konstrukcije. 2003;48(1):14-20.
https://hdl.handle.net/21.15107/rcub_technorep_573 .

Radović, Nenad, Grabulov, Vencislav, Smiljanić, Mirjana, Antić, Milica, "Ni alloyed steels for low temperature service" in Zavarivanje i zavarene konstrukcije, 48, no. 1 (2003):14-20,
https://hdl.handle.net/21.15107/rcub_technorep_573 .

TY  - JOUR
AU  - Rakin, Marko
AU  - Cvijović, Zorica
AU  - Grabulov, Vencislav
AU  - Blačić, Ivo
AU  - Zrilić, Milorad
AU  - Putić, Slaviša
PY  - 2001
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/386
AB  - In the presented paper a micromechanical model based on a particular flow criterion of a porous solid has been applied. In this study crack initiation in the smooth specimen made of steel 22 NiMoCr 3 7 has been analyzed; the micromechanical model was incorporated into the finite element (FE) program. Initial data related to non-metallic inclusions were determined by the quantitative optical microscopy. The study was performed within the scope of ESIS TC8 Numerical Round Robin on Micromechanical Models, Phase II, Task A.... .
AB  - U radu je primenjen mikromehanički model zasnovan na posebnom kriterijumu plastičnog tečenja materijala. Nastanak prsline izazvan pojavom, rastom i spajanjem šupljina, analiziran je na osnovu ponašanja pri zatezanju glatke cilindrične epruvete izrađene od čelika 22 NiMoCr 3 7. Ulazni podaci za proračun koji se odnose na zastupljenost i veličinu nemetalnih uključaka su određeni optičkom mikroskopijom. Dobijeni rezultati ukazuju da primenjeni mikromehanički model može da se koristi za karakterizaciju materijala i analizu pojave prsline u standardnoj epruveti izrađenoj od konstrukcionog čelika, a da je kvantitativna metalurška analiza neophodna za opis prve faze žilavog loma - nastanak šupljina. .
PB  - Vojnotehnički institut, Beograd
T2  - Naučno-tehnički pregled
T1  - Analysis of crack initiation by micromechanism of ductile fracture in structural steel
T1  - Analiza nastanka prsline mikromehanizmom žilavog loma u konstrukcionom čeliku
EP  - 17
IS  - 2
SP  - 13
VL  - 51
UR  - https://hdl.handle.net/21.15107/rcub_technorep_386
ER  - 

@article{
author = "Rakin, Marko and Cvijović, Zorica and Grabulov, Vencislav and Blačić, Ivo and Zrilić, Milorad and Putić, Slaviša",
year = "2001",
abstract = "In the presented paper a micromechanical model based on a particular flow criterion of a porous solid has been applied. In this study crack initiation in the smooth specimen made of steel 22 NiMoCr 3 7 has been analyzed; the micromechanical model was incorporated into the finite element (FE) program. Initial data related to non-metallic inclusions were determined by the quantitative optical microscopy. The study was performed within the scope of ESIS TC8 Numerical Round Robin on Micromechanical Models, Phase II, Task A.... ., U radu je primenjen mikromehanički model zasnovan na posebnom kriterijumu plastičnog tečenja materijala. Nastanak prsline izazvan pojavom, rastom i spajanjem šupljina, analiziran je na osnovu ponašanja pri zatezanju glatke cilindrične epruvete izrađene od čelika 22 NiMoCr 3 7. Ulazni podaci za proračun koji se odnose na zastupljenost i veličinu nemetalnih uključaka su određeni optičkom mikroskopijom. Dobijeni rezultati ukazuju da primenjeni mikromehanički model može da se koristi za karakterizaciju materijala i analizu pojave prsline u standardnoj epruveti izrađenoj od konstrukcionog čelika, a da je kvantitativna metalurška analiza neophodna za opis prve faze žilavog loma - nastanak šupljina. .",
publisher = "Vojnotehnički institut, Beograd",
journal = "Naučno-tehnički pregled",
title = "Analysis of crack initiation by micromechanism of ductile fracture in structural steel, Analiza nastanka prsline mikromehanizmom žilavog loma u konstrukcionom čeliku",
pages = "17-13",
number = "2",
volume = "51",
url = "https://hdl.handle.net/21.15107/rcub_technorep_386"
}

Rakin, M., Cvijović, Z., Grabulov, V., Blačić, I., Zrilić, M.,& Putić, S.. (2001). Analysis of crack initiation by micromechanism of ductile fracture in structural steel. in Naučno-tehnički pregled
Vojnotehnički institut, Beograd., 51(2), 13-17.
https://hdl.handle.net/21.15107/rcub_technorep_386

Rakin M, Cvijović Z, Grabulov V, Blačić I, Zrilić M, Putić S. Analysis of crack initiation by micromechanism of ductile fracture in structural steel. in Naučno-tehnički pregled. 2001;51(2):13-17.
https://hdl.handle.net/21.15107/rcub_technorep_386 .

Rakin, Marko, Cvijović, Zorica, Grabulov, Vencislav, Blačić, Ivo, Zrilić, Milorad, Putić, Slaviša, "Analysis of crack initiation by micromechanism of ductile fracture in structural steel" in Naučno-tehnički pregled, 51, no. 2 (2001):13-17,
https://hdl.handle.net/21.15107/rcub_technorep_386 .

TY  - JOUR
AU  - Rakin, Marko
AU  - Cvijović, Zorica
AU  - Grabulov, Vencislav
AU  - Kojić, Miloš
PY  - 2000
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/319
AB  - Micromechanism of ductile fracture of most metals and alloys includes void nucleation, growth and coalescence. The voids nucleate at the second phase particles and non-metallic inclusions. Application of so-called global criteria of fracture mechanics such as COD and J-integral in characterization of ductile fracture onset does not provide satisfactory results for all cases of external loading. The problems arising in solving the phenomenon of severe plastic strain at crack tips and application of the results obtained to describe behaviour of various structures of different geometry are not insignificant. In present paper micromechanical model based on a particular criterion of flow in a porous solid has been applied. The model was initially established by Gurson, and later on modified by Tvergaard and Needleman. Unlike traditional flow criteria (for instance, with metals widely applied Von Mises criterion), established flow introduces volume fraction (f) variable. Through application of this model, by combining experimental and numerical procedures, an effort is made to predict ductile fracture of metals. In present paper fracture initiation of smooth specimen has been analyzed; described model was incorporated into finite element (FE) program, so that one of the results for each Gauss point may be void volume fraction as well. Probably the most difficult part of such a characterization of ductile fracture is to present physically void nucleation as accurately as possible. An approach to void nucleation, suggested by Chu and Needleman, has been discussed in this paper; the model is based on hypothesis that void nucleation follows a normal distribution of void formation predominantly around coarser non-metallic inclusions in steel. It is particularly problematic to examine secondary voids nucleation around smaller non-metallic inclusions and second phase particles, and to realize their effects on further growth of the existing (primary) voids, and especially on their coalescence resulting in fracture. This has been accompanied by adequate metallographic analysis of non-metallic inclusions and their volume fraction, which represents starting results for elastic-plastic analysis of a porous solid using FE method. The results obtained suggest that applied micromechanical model can be used for characterization of initiation of ductile fracture in steel on geometries -without precracks, and that metallurgical analysis is necessary to describe physically the first phase - void nucleation. Special contribution should represent application of the results obtained with a simple geometry to the precrached structures, which should be confirmed in work to follow. .
AB  - U radu su, polazeći od rezultata dobijenih numeričkim putem, koristeći pretpostavku o elastično-plastičnom telu, na standardnom kružnom uzorku od nisko legiranog čelika za sudove pod pritiskom, izvedeni sledeći zaključci: -razlika između GTN modela sa udelom zapreminske poroznosti uključenim u kriterijum strujanja i tradicionalnog Von Mises-ovog je mala: oba proračuna daju rezultate bliske eksperimentalnim -FE proračun koji koristi elemente sa osam čvorova omogućuje da se približno odredi dijagram zavisnosti tačke koalescencije pora od smanjenja prečnika -određivanje zapreminskog kritičnog udela poroznosti fc -procedura bi se trebalo proveriti kod oblika sa predprskotinama. .
PB  - University of Niš
T2  - Facta universitatis - series: Mechanical Engineering
T1  - Micromechanism of ductile fracture initiation: Void nucleation and growth
T1  - Mikromehanizam inicijalizacije daktilnih fraktura - nukleacija prskotina i njihov rast
EP  - 833
IS  - 7
SP  - 825
VL  - 1
UR  - https://hdl.handle.net/21.15107/rcub_technorep_319
ER  - 

@article{
author = "Rakin, Marko and Cvijović, Zorica and Grabulov, Vencislav and Kojić, Miloš",
year = "2000",
abstract = "Micromechanism of ductile fracture of most metals and alloys includes void nucleation, growth and coalescence. The voids nucleate at the second phase particles and non-metallic inclusions. Application of so-called global criteria of fracture mechanics such as COD and J-integral in characterization of ductile fracture onset does not provide satisfactory results for all cases of external loading. The problems arising in solving the phenomenon of severe plastic strain at crack tips and application of the results obtained to describe behaviour of various structures of different geometry are not insignificant. In present paper micromechanical model based on a particular criterion of flow in a porous solid has been applied. The model was initially established by Gurson, and later on modified by Tvergaard and Needleman. Unlike traditional flow criteria (for instance, with metals widely applied Von Mises criterion), established flow introduces volume fraction (f) variable. Through application of this model, by combining experimental and numerical procedures, an effort is made to predict ductile fracture of metals. In present paper fracture initiation of smooth specimen has been analyzed; described model was incorporated into finite element (FE) program, so that one of the results for each Gauss point may be void volume fraction as well. Probably the most difficult part of such a characterization of ductile fracture is to present physically void nucleation as accurately as possible. An approach to void nucleation, suggested by Chu and Needleman, has been discussed in this paper; the model is based on hypothesis that void nucleation follows a normal distribution of void formation predominantly around coarser non-metallic inclusions in steel. It is particularly problematic to examine secondary voids nucleation around smaller non-metallic inclusions and second phase particles, and to realize their effects on further growth of the existing (primary) voids, and especially on their coalescence resulting in fracture. This has been accompanied by adequate metallographic analysis of non-metallic inclusions and their volume fraction, which represents starting results for elastic-plastic analysis of a porous solid using FE method. The results obtained suggest that applied micromechanical model can be used for characterization of initiation of ductile fracture in steel on geometries -without precracks, and that metallurgical analysis is necessary to describe physically the first phase - void nucleation. Special contribution should represent application of the results obtained with a simple geometry to the precrached structures, which should be confirmed in work to follow. ., U radu su, polazeći od rezultata dobijenih numeričkim putem, koristeći pretpostavku o elastično-plastičnom telu, na standardnom kružnom uzorku od nisko legiranog čelika za sudove pod pritiskom, izvedeni sledeći zaključci: -razlika između GTN modela sa udelom zapreminske poroznosti uključenim u kriterijum strujanja i tradicionalnog Von Mises-ovog je mala: oba proračuna daju rezultate bliske eksperimentalnim -FE proračun koji koristi elemente sa osam čvorova omogućuje da se približno odredi dijagram zavisnosti tačke koalescencije pora od smanjenja prečnika -određivanje zapreminskog kritičnog udela poroznosti fc -procedura bi se trebalo proveriti kod oblika sa predprskotinama. .",
publisher = "University of Niš",
journal = "Facta universitatis - series: Mechanical Engineering",
title = "Micromechanism of ductile fracture initiation: Void nucleation and growth, Mikromehanizam inicijalizacije daktilnih fraktura - nukleacija prskotina i njihov rast",
pages = "833-825",
number = "7",
volume = "1",
url = "https://hdl.handle.net/21.15107/rcub_technorep_319"
}

Rakin, M., Cvijović, Z., Grabulov, V.,& Kojić, M.. (2000). Micromechanism of ductile fracture initiation: Void nucleation and growth. in Facta universitatis - series: Mechanical Engineering
University of Niš., 1(7), 825-833.
https://hdl.handle.net/21.15107/rcub_technorep_319

Rakin M, Cvijović Z, Grabulov V, Kojić M. Micromechanism of ductile fracture initiation: Void nucleation and growth. in Facta universitatis - series: Mechanical Engineering. 2000;1(7):825-833.
https://hdl.handle.net/21.15107/rcub_technorep_319 .

Rakin, Marko, Cvijović, Zorica, Grabulov, Vencislav, Kojić, Miloš, "Micromechanism of ductile fracture initiation: Void nucleation and growth" in Facta universitatis - series: Mechanical Engineering, 1, no. 7 (2000):825-833,
https://hdl.handle.net/21.15107/rcub_technorep_319 .