TY  - JOUR
AU  - Burzić, Zijah
AU  - Perković, Srđa
AU  - Lisov, Miodrag
AU  - Grabulov, Vencislav
AU  - Burzić, Meri
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3704
AB  - U radu su prikazana eksperimentalna istraživanja koja uključuju analizu stvaranja i rasta prsline u zavarenom spoju čelika za rad na povišenim temperaturama. Za bolje razumevanje fenomena stvaranja i rasta prsline u zavarenim spojevima čelika A-204 Gr. A, namenjenog za rad na visokim temperaturama i pritiscima, potrebno je utvrditi uticaj heterogenosti mikrostrukturnih i mehaničkih svojstava na žilavost loma i stvaranje i rast zamorne prsline u komponentama zavarenog spoja. Na osnovu ispitivanja provedenih na CT i Charpy epruvetama na kojima su prethodno inicirane prsline utvrđen je uticaj heterogenosti mikrostrukturnih i mehaničkih svojstava zavarenog spojeva na žilavost loma i parametre rasta zamorne prsline.
AB  - In a paper given, experimental investigations have included the analysis of crack initiation and growth in welded joint of steel for operation at elevated temperatures. For better understanding of the phenomenon of crack initiation and propagation in welded joints of A-204 Gr. A steel, designed for high-temperature and high-pressure application, it is necessary to determine the effect of heterogeneity of microstructural and mechanical properties on fracture toughness and fatigue crack initiation and propagation in welded components. Based on the tests conducted with pre-cracked CT and Charpy size specimens, the effect of heterogeneity of microstructural and mechanical properties of welded joints on fracture toughness and fatigue-crack growth parameters was determined.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Inicijacija i rast prsline u zavarenom spoju čelika za rad na povišenim temperaturama
T1  - Crack initiation and growth in welded joint of steel for operation at elevated temperature
EP  - 61
IS  - 2
SP  - 53
VL  - 67
DO  - 10.5937/zzk2202053B
ER  - 

@article{
author = "Burzić, Zijah and Perković, Srđa and Lisov, Miodrag and Grabulov, Vencislav and Burzić, Meri",
year = "2022",
abstract = "U radu su prikazana eksperimentalna istraživanja koja uključuju analizu stvaranja i rasta prsline u zavarenom spoju čelika za rad na povišenim temperaturama. Za bolje razumevanje fenomena stvaranja i rasta prsline u zavarenim spojevima čelika A-204 Gr. A, namenjenog za rad na visokim temperaturama i pritiscima, potrebno je utvrditi uticaj heterogenosti mikrostrukturnih i mehaničkih svojstava na žilavost loma i stvaranje i rast zamorne prsline u komponentama zavarenog spoja. Na osnovu ispitivanja provedenih na CT i Charpy epruvetama na kojima su prethodno inicirane prsline utvrđen je uticaj heterogenosti mikrostrukturnih i mehaničkih svojstava zavarenog spojeva na žilavost loma i parametre rasta zamorne prsline., In a paper given, experimental investigations have included the analysis of crack initiation and growth in welded joint of steel for operation at elevated temperatures. For better understanding of the phenomenon of crack initiation and propagation in welded joints of A-204 Gr. A steel, designed for high-temperature and high-pressure application, it is necessary to determine the effect of heterogeneity of microstructural and mechanical properties on fracture toughness and fatigue crack initiation and propagation in welded components. Based on the tests conducted with pre-cracked CT and Charpy size specimens, the effect of heterogeneity of microstructural and mechanical properties of welded joints on fracture toughness and fatigue-crack growth parameters was determined.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Inicijacija i rast prsline u zavarenom spoju čelika za rad na povišenim temperaturama, Crack initiation and growth in welded joint of steel for operation at elevated temperature",
pages = "61-53",
number = "2",
volume = "67",
doi = "10.5937/zzk2202053B"
}

Burzić, Z., Perković, S., Lisov, M., Grabulov, V.,& Burzić, M.. (2022). Inicijacija i rast prsline u zavarenom spoju čelika za rad na povišenim temperaturama. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 67(2), 53-61.
https://doi.org/10.5937/zzk2202053B

Burzić Z, Perković S, Lisov M, Grabulov V, Burzić M. Inicijacija i rast prsline u zavarenom spoju čelika za rad na povišenim temperaturama. in Zavarivanje i zavarene konstrukcije. 2022;67(2):53-61.
doi:10.5937/zzk2202053B .

Burzić, Zijah, Perković, Srđa, Lisov, Miodrag, Grabulov, Vencislav, Burzić, Meri, "Inicijacija i rast prsline u zavarenom spoju čelika za rad na povišenim temperaturama" in Zavarivanje i zavarene konstrukcije, 67, no. 2 (2022):53-61,
https://doi.org/10.5937/zzk2202053B . .

TY  - JOUR
AU  - Janjatović, Petar D.
AU  - Erić-Cekić, Olivera
AU  - Rajnović, Dragan
AU  - Baloš, Sebastian
AU  - Grabulov, Vencislav
AU  - Šiđanin, Leposava
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3692
AB  - Dual-phase ADI material microstructure consists of different amounts and morphologies of ausferrite and free ferrite, obtained by subjecting ductile iron to specific heat treatment. Its strength is lower compared to comparable ADI materials but exhibits a higher ductility, the major disadvantage of ADI. In the current study, an unalloyed ductile iron was intercritical austenitized in two-phase regions (??+??) at four temperatures from 840 to 780 ??C for 2 h and austempered at 400 ??C for 1 h to obtain dual-phase ADI with different percentages of free ferrite and ausferrite. Light and scanning electron microscopy was performed for the metallographic and fracture studies, respectively. Microscopy results were correlated to tensile testing results. The results indicated that, as the amount of ausferrite present in the matrix increases, higher values of strength and lower ductility are obtained. The fracture surfaces of dual-phase ADI microstructures with 22.8% of ausferrite in their matrix have regions of quasi-cleavage fracture around last-to-freeze zones, related to the presence of ausferrite in those areas. The specimens with the highest values of ausferrite of 86.8% among the dual-phase microstructure have a dominant quasi-cleavage type of fracture.
PB  - Savez hemijskih inženjera, Beograd
T2  - Chemical Industry & Chemical Engineering Quarterly
T1  - Microstructure and fracture mode of unalloyed dual-phase austempered ductile iron
EP  - 167
IS  - 2
SP  - 161
VL  - 28
DO  - 10.2298/CICEQ201222027J
ER  - 

@article{
author = "Janjatović, Petar D. and Erić-Cekić, Olivera and Rajnović, Dragan and Baloš, Sebastian and Grabulov, Vencislav and Šiđanin, Leposava",
year = "2022",
abstract = "Dual-phase ADI material microstructure consists of different amounts and morphologies of ausferrite and free ferrite, obtained by subjecting ductile iron to specific heat treatment. Its strength is lower compared to comparable ADI materials but exhibits a higher ductility, the major disadvantage of ADI. In the current study, an unalloyed ductile iron was intercritical austenitized in two-phase regions (??+??) at four temperatures from 840 to 780 ??C for 2 h and austempered at 400 ??C for 1 h to obtain dual-phase ADI with different percentages of free ferrite and ausferrite. Light and scanning electron microscopy was performed for the metallographic and fracture studies, respectively. Microscopy results were correlated to tensile testing results. The results indicated that, as the amount of ausferrite present in the matrix increases, higher values of strength and lower ductility are obtained. The fracture surfaces of dual-phase ADI microstructures with 22.8% of ausferrite in their matrix have regions of quasi-cleavage fracture around last-to-freeze zones, related to the presence of ausferrite in those areas. The specimens with the highest values of ausferrite of 86.8% among the dual-phase microstructure have a dominant quasi-cleavage type of fracture.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Chemical Industry & Chemical Engineering Quarterly",
title = "Microstructure and fracture mode of unalloyed dual-phase austempered ductile iron",
pages = "167-161",
number = "2",
volume = "28",
doi = "10.2298/CICEQ201222027J"
}

Janjatović, P. D., Erić-Cekić, O., Rajnović, D., Baloš, S., Grabulov, V.,& Šiđanin, L.. (2022). Microstructure and fracture mode of unalloyed dual-phase austempered ductile iron. in Chemical Industry & Chemical Engineering Quarterly
Savez hemijskih inženjera, Beograd., 28(2), 161-167.
https://doi.org/10.2298/CICEQ201222027J

Janjatović PD, Erić-Cekić O, Rajnović D, Baloš S, Grabulov V, Šiđanin L. Microstructure and fracture mode of unalloyed dual-phase austempered ductile iron. in Chemical Industry & Chemical Engineering Quarterly. 2022;28(2):161-167.
doi:10.2298/CICEQ201222027J .

Janjatović, Petar D., Erić-Cekić, Olivera, Rajnović, Dragan, Baloš, Sebastian, Grabulov, Vencislav, Šiđanin, Leposava, "Microstructure and fracture mode of unalloyed dual-phase austempered ductile iron" in Chemical Industry & Chemical Engineering Quarterly, 28, no. 2 (2022):161-167,
https://doi.org/10.2298/CICEQ201222027J . .

TY  - JOUR
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Mladenović, M.
AU  - Savić, Zoran
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5232
AB  - This paper contains results of tests performed in order to determine mechanical properties
of steel P460NL1, used as filler material during the execution of welded joints. Arc welding
of samples from which the specimens were taken was carried out through the application of welding process 111, because it is one of the processes for the execution of pipelines for pressure equipment. Microspecimens with diameter of 1,5 mm were tested in order to determine tensile properties of material taken from the heat-affected zone and weld metal, while specimens with diameter of 6 mm were tested in order to determine tensile properties of parent material. Standard Charpy V-notch specimens were used in order to determine impact energy. Results of metallographic tests which refer to the structure of a pipe welded joint are also presented.
PB  - Trans Tech Publications Ltd, Switzerland
T2  - Advanced Materials Research
T1  - Testing of welded joints between pipes for pressure vessels made of hot rolled fine-grained steel P460NL1
VL  - 1157
DO  - 10.4028/www.scientific.net/AMR.1157.15
ER  - 

@article{
author = "Arsić, Miodrag and Bošnjak, Srđan and Grabulov, Vencislav and Mladenović, M. and Savić, Zoran",
year = "2020",
abstract = "This paper contains results of tests performed in order to determine mechanical properties
of steel P460NL1, used as filler material during the execution of welded joints. Arc welding
of samples from which the specimens were taken was carried out through the application of welding process 111, because it is one of the processes for the execution of pipelines for pressure equipment. Microspecimens with diameter of 1,5 mm were tested in order to determine tensile properties of material taken from the heat-affected zone and weld metal, while specimens with diameter of 6 mm were tested in order to determine tensile properties of parent material. Standard Charpy V-notch specimens were used in order to determine impact energy. Results of metallographic tests which refer to the structure of a pipe welded joint are also presented.",
publisher = "Trans Tech Publications Ltd, Switzerland",
journal = "Advanced Materials Research",
title = "Testing of welded joints between pipes for pressure vessels made of hot rolled fine-grained steel P460NL1",
volume = "1157",
doi = "10.4028/www.scientific.net/AMR.1157.15"
}

Arsić, M., Bošnjak, S., Grabulov, V., Mladenović, M.,& Savić, Z.. (2020). Testing of welded joints between pipes for pressure vessels made of hot rolled fine-grained steel P460NL1. in Advanced Materials Research
Trans Tech Publications Ltd, Switzerland., 1157.
https://doi.org/10.4028/www.scientific.net/AMR.1157.15

Arsić M, Bošnjak S, Grabulov V, Mladenović M, Savić Z. Testing of welded joints between pipes for pressure vessels made of hot rolled fine-grained steel P460NL1. in Advanced Materials Research. 2020;1157.
doi:10.4028/www.scientific.net/AMR.1157.15 .

Arsić, Miodrag, Bošnjak, Srđan, Grabulov, Vencislav, Mladenović, M., Savić, Zoran, "Testing of welded joints between pipes for pressure vessels made of hot rolled fine-grained steel P460NL1" in Advanced Materials Research, 1157 (2020),
https://doi.org/10.4028/www.scientific.net/AMR.1157.15 . .

TY  - CONF
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Gnjatović, Nebojša
AU  - Milenović, Ivan Lj.
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4938
AB  - Damaging of the carrying steel structure and embedding of the rejecting drum of the stacker conveyor occurred during the exploitation of the bucket-wheel reclaimer with the belonging stacker. The analysis of the cause and level of damaging led to the conclusion that damaged parts should be replaced by new ones and that methodology of repair should be based on the application of a suitable welding technology. This paper presents the methodology of repair welding performed during the replacement of the damaged carrying structure and embedding of the rejecting drum of the stacker conveyor which consist of steel sheets and profiles that’s based on the conceptual solution for damage repair through the use of program package ’Catia’ – V5 that enabled the creation of models and graphic documentation of structural parts that should be replaced by new ones. It should also be noted that geodetic survey of the lower belt of the stacker structure was performed after the substitution of damaged parts of the structure.
PB  - University of Belgrade, Faculty of Mechanical Engineering
C3  - Proceedings of the XXIII International Conference MHCL’19
T1  - Repair methodology for the carrying structure of the rejecting drum of the bucket-wheel reclaimer stacker conveyor at coal landfill
EP  - 122
SP  - 117
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4938
ER  - 

@conference{
author = "Arsić, Miodrag and Bošnjak, Srđan and Grabulov, Vencislav and Gnjatović, Nebojša and Milenović, Ivan Lj.",
year = "2019",
abstract = "Damaging of the carrying steel structure and embedding of the rejecting drum of the stacker conveyor occurred during the exploitation of the bucket-wheel reclaimer with the belonging stacker. The analysis of the cause and level of damaging led to the conclusion that damaged parts should be replaced by new ones and that methodology of repair should be based on the application of a suitable welding technology. This paper presents the methodology of repair welding performed during the replacement of the damaged carrying structure and embedding of the rejecting drum of the stacker conveyor which consist of steel sheets and profiles that’s based on the conceptual solution for damage repair through the use of program package ’Catia’ – V5 that enabled the creation of models and graphic documentation of structural parts that should be replaced by new ones. It should also be noted that geodetic survey of the lower belt of the stacker structure was performed after the substitution of damaged parts of the structure.",
publisher = "University of Belgrade, Faculty of Mechanical Engineering",
journal = "Proceedings of the XXIII International Conference MHCL’19",
title = "Repair methodology for the carrying structure of the rejecting drum of the bucket-wheel reclaimer stacker conveyor at coal landfill",
pages = "122-117",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4938"
}

Arsić, M., Bošnjak, S., Grabulov, V., Gnjatović, N.,& Milenović, I. Lj.. (2019). Repair methodology for the carrying structure of the rejecting drum of the bucket-wheel reclaimer stacker conveyor at coal landfill. in Proceedings of the XXIII International Conference MHCL’19
University of Belgrade, Faculty of Mechanical Engineering., 117-122.
https://hdl.handle.net/21.15107/rcub_machinery_4938

Arsić M, Bošnjak S, Grabulov V, Gnjatović N, Milenović IL. Repair methodology for the carrying structure of the rejecting drum of the bucket-wheel reclaimer stacker conveyor at coal landfill. in Proceedings of the XXIII International Conference MHCL’19. 2019;:117-122.
https://hdl.handle.net/21.15107/rcub_machinery_4938 .

Arsić, Miodrag, Bošnjak, Srđan, Grabulov, Vencislav, Gnjatović, Nebojša, Milenović, Ivan Lj., "Repair methodology for the carrying structure of the rejecting drum of the bucket-wheel reclaimer stacker conveyor at coal landfill" in Proceedings of the XXIII International Conference MHCL’19 (2019):117-122,
https://hdl.handle.net/21.15107/rcub_machinery_4938 .

TY  - CONF
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Arsić, Dušan
AU  - Savić, Zoran
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5237
AB  - During the rehabilitation of turbine and hydromechanical equipment at hydro power plant 'Djerdap 1' results of tests and researches carried out in order to analyze the condition of vital components and structures during service led to the conclusion that the components and structures could be made only if parameters of fracture mechanics were applied during the design and prototyping phase, because by doing so the occurrence of fatigue fracture and/or degradation of parent material and welded joints due to variable loading, corrosion, erosion and cavitation would be prevented, therefore the integrity of material would be maintained. Experimental determination of the fatigue crack propagation rate as an important property of development of the fatigue process during the action of the variable load, from the initial to the critical length, enables the prediction of the stable crack propagation period, or in other words of the service life of vital components and structures of turbine and hydromechanical equipment. Taking into account the fact that cracks are most severe of all defects, the results obtained for cracks could safely be applied for other types of defects which often occur in welded joints. This
paper contains the methodological approaches for the assessment of integrity and evaluation of service life of components and structures of turbine and hydromechanical equipment during the design, prototyping and service period based on history of fatigue loading and application of fracture mechanics parameters.
PB  - University of Banja Luka-Faculty of Mechanical Engineering
C3  - Proceedings of the 14th International conference on accomplishments in mechanical and industrial engineering „DEMI 2019”
T1  - Prediction of service life of components and structures of hydro power plants during the design, prototyping and service period
EP  - 188
SP  - 183
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5237
ER  - 

@conference{
author = "Arsić, Miodrag and Bošnjak, Srđan and Grabulov, Vencislav and Arsić, Dušan and Savić, Zoran",
year = "2019",
abstract = "During the rehabilitation of turbine and hydromechanical equipment at hydro power plant 'Djerdap 1' results of tests and researches carried out in order to analyze the condition of vital components and structures during service led to the conclusion that the components and structures could be made only if parameters of fracture mechanics were applied during the design and prototyping phase, because by doing so the occurrence of fatigue fracture and/or degradation of parent material and welded joints due to variable loading, corrosion, erosion and cavitation would be prevented, therefore the integrity of material would be maintained. Experimental determination of the fatigue crack propagation rate as an important property of development of the fatigue process during the action of the variable load, from the initial to the critical length, enables the prediction of the stable crack propagation period, or in other words of the service life of vital components and structures of turbine and hydromechanical equipment. Taking into account the fact that cracks are most severe of all defects, the results obtained for cracks could safely be applied for other types of defects which often occur in welded joints. This
paper contains the methodological approaches for the assessment of integrity and evaluation of service life of components and structures of turbine and hydromechanical equipment during the design, prototyping and service period based on history of fatigue loading and application of fracture mechanics parameters.",
publisher = "University of Banja Luka-Faculty of Mechanical Engineering",
journal = "Proceedings of the 14th International conference on accomplishments in mechanical and industrial engineering „DEMI 2019”",
title = "Prediction of service life of components and structures of hydro power plants during the design, prototyping and service period",
pages = "188-183",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5237"
}

Arsić, M., Bošnjak, S., Grabulov, V., Arsić, D.,& Savić, Z.. (2019). Prediction of service life of components and structures of hydro power plants during the design, prototyping and service period. in Proceedings of the 14th International conference on accomplishments in mechanical and industrial engineering „DEMI 2019”
University of Banja Luka-Faculty of Mechanical Engineering., 183-188.
https://hdl.handle.net/21.15107/rcub_machinery_5237

Arsić M, Bošnjak S, Grabulov V, Arsić D, Savić Z. Prediction of service life of components and structures of hydro power plants during the design, prototyping and service period. in Proceedings of the 14th International conference on accomplishments in mechanical and industrial engineering „DEMI 2019”. 2019;:183-188.
https://hdl.handle.net/21.15107/rcub_machinery_5237 .

Arsić, Miodrag, Bošnjak, Srđan, Grabulov, Vencislav, Arsić, Dušan, Savić, Zoran, "Prediction of service life of components and structures of hydro power plants during the design, prototyping and service period" in Proceedings of the 14th International conference on accomplishments in mechanical and industrial engineering „DEMI 2019” (2019):183-188,
https://hdl.handle.net/21.15107/rcub_machinery_5237 .

TY  - JOUR
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Mladenović, M.
AU  - Savić, Zoran
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5234
AB  - Vertical Kaplan turbines, with nominal power of 178 MW and manufactured in Russia,
have been installed in 6 hydroelectric generating units of hydro power plant ’Djerdap 1’.
Experimental tests were carried out by non-destructive methods in order to determine the turbine condition during the rehabilitation of the hydro power plant. Lack of root penetration was detected in V40 welded joints between upper and lower sleeves and bodies of guide vane apparatus vanes. Height of the lack of root penetration was in the range between 5 and 15 mm, while the allowable height of the lack of root penetration is 3 mm, according to the technical conditions. The upper sleeves were made of cast steel 25L (in accordance with GOST 977), while lower sleeves were made of steel forging St 25 (in accordance with standards GOST 1050 for chemical composition and GOST 8479 for forgings).Methodology for the repair of non-penetrated welded joints between the sleeves and body of the guide vane apparatus vane was composed taking into account the results of ultrasonic testing. By repair methodology it is necessary to, due to the structural solution and service function of guide vane apparatus vanes, specify a large number of details, consider them carefully and carry them out in order to improve safety, because if some of them get overlooked, underestimated or incorrectly perceived, significant problems in turbine operation may occur.This methodology refers solely to the repair of damaged welded joints between sleeves and bodies of guide vane apparatus vanes.
PB  - Trans Tech Publications Ltd, Switzerland
T2  - Advanced Materials Research
T1  - Repair of damages that occurred on the welded joints at the body of guide vane apparatus vanes of the vertical Kaplan turbine
VL  - 1153
DO  - 10.4028/www.scientific.net/AMR.1153.1
ER  - 

@article{
author = "Arsić, Miodrag and Bošnjak, Srđan and Grabulov, Vencislav and Mladenović, M. and Savić, Zoran",
year = "2019",
abstract = "Vertical Kaplan turbines, with nominal power of 178 MW and manufactured in Russia,
have been installed in 6 hydroelectric generating units of hydro power plant ’Djerdap 1’.
Experimental tests were carried out by non-destructive methods in order to determine the turbine condition during the rehabilitation of the hydro power plant. Lack of root penetration was detected in V40 welded joints between upper and lower sleeves and bodies of guide vane apparatus vanes. Height of the lack of root penetration was in the range between 5 and 15 mm, while the allowable height of the lack of root penetration is 3 mm, according to the technical conditions. The upper sleeves were made of cast steel 25L (in accordance with GOST 977), while lower sleeves were made of steel forging St 25 (in accordance with standards GOST 1050 for chemical composition and GOST 8479 for forgings).Methodology for the repair of non-penetrated welded joints between the sleeves and body of the guide vane apparatus vane was composed taking into account the results of ultrasonic testing. By repair methodology it is necessary to, due to the structural solution and service function of guide vane apparatus vanes, specify a large number of details, consider them carefully and carry them out in order to improve safety, because if some of them get overlooked, underestimated or incorrectly perceived, significant problems in turbine operation may occur.This methodology refers solely to the repair of damaged welded joints between sleeves and bodies of guide vane apparatus vanes.",
publisher = "Trans Tech Publications Ltd, Switzerland",
journal = "Advanced Materials Research",
title = "Repair of damages that occurred on the welded joints at the body of guide vane apparatus vanes of the vertical Kaplan turbine",
volume = "1153",
doi = "10.4028/www.scientific.net/AMR.1153.1"
}

Arsić, M., Bošnjak, S., Grabulov, V., Mladenović, M.,& Savić, Z.. (2019). Repair of damages that occurred on the welded joints at the body of guide vane apparatus vanes of the vertical Kaplan turbine. in Advanced Materials Research
Trans Tech Publications Ltd, Switzerland., 1153.
https://doi.org/10.4028/www.scientific.net/AMR.1153.1

Arsić M, Bošnjak S, Grabulov V, Mladenović M, Savić Z. Repair of damages that occurred on the welded joints at the body of guide vane apparatus vanes of the vertical Kaplan turbine. in Advanced Materials Research. 2019;1153.
doi:10.4028/www.scientific.net/AMR.1153.1 .

Arsić, Miodrag, Bošnjak, Srđan, Grabulov, Vencislav, Mladenović, M., Savić, Zoran, "Repair of damages that occurred on the welded joints at the body of guide vane apparatus vanes of the vertical Kaplan turbine" in Advanced Materials Research, 1153 (2019),
https://doi.org/10.4028/www.scientific.net/AMR.1153.1 . .

TY  - CONF
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Vistać, Brane
AU  - Savić, Zoran
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5297
AB  - Vertical Kaplan turbines were installed in 6 hydroelectric generating sets at "Djerdap 1", nominal power 178 MW, that were made in Russia. During the refurbishment of the hydroelectric generating set Al at the hydro power plant Djerdap 1, experimental non-destructive tests on all of its components were performed in order to determine the state of the turbine as a whole. During the testing the damages and cracks were detected on internal surfaces of cranks and sleeves of guide vane apparatus vanes, which were caused by turbine shaft vibrations. Cranks and sleeves were made of cast steel 25L, in accordance with the standard GOST 977. The repair methodology for damaged internal surfaces of cranks of guide vane apparatus vanes is presented in this paper. It was necessary, due to the structural solution used for the design of cranks and sleeves and their function during exploitation, to define a large number of details, carefully reconsider them and carry out all activities with extreme care in order to enable the safe operation and continuous use of cranks. Overlooking, underestimation or incorrect perception of important details could cause significant problems during turbine operation.
PB  - Macedonian Union of Metallurgists
C3  - VIIIth International Metallurgical Congress
T1  - Repair of damaged surfaces at the vital section of the regulatory mechanism of the hydro turbine guide vane apparatus
EP  - 6
SP  - 1
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5297
ER  - 

@conference{
author = "Arsić, Miodrag and Bošnjak, Srđan and Grabulov, Vencislav and Vistać, Brane and Savić, Zoran",
year = "2018",
abstract = "Vertical Kaplan turbines were installed in 6 hydroelectric generating sets at "Djerdap 1", nominal power 178 MW, that were made in Russia. During the refurbishment of the hydroelectric generating set Al at the hydro power plant Djerdap 1, experimental non-destructive tests on all of its components were performed in order to determine the state of the turbine as a whole. During the testing the damages and cracks were detected on internal surfaces of cranks and sleeves of guide vane apparatus vanes, which were caused by turbine shaft vibrations. Cranks and sleeves were made of cast steel 25L, in accordance with the standard GOST 977. The repair methodology for damaged internal surfaces of cranks of guide vane apparatus vanes is presented in this paper. It was necessary, due to the structural solution used for the design of cranks and sleeves and their function during exploitation, to define a large number of details, carefully reconsider them and carry out all activities with extreme care in order to enable the safe operation and continuous use of cranks. Overlooking, underestimation or incorrect perception of important details could cause significant problems during turbine operation.",
publisher = "Macedonian Union of Metallurgists",
journal = "VIIIth International Metallurgical Congress",
title = "Repair of damaged surfaces at the vital section of the regulatory mechanism of the hydro turbine guide vane apparatus",
pages = "6-1",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5297"
}

Arsić, M., Bošnjak, S., Grabulov, V., Vistać, B.,& Savić, Z.. (2018). Repair of damaged surfaces at the vital section of the regulatory mechanism of the hydro turbine guide vane apparatus. in VIIIth International Metallurgical Congress
Macedonian Union of Metallurgists., 1-6.
https://hdl.handle.net/21.15107/rcub_machinery_5297

Arsić M, Bošnjak S, Grabulov V, Vistać B, Savić Z. Repair of damaged surfaces at the vital section of the regulatory mechanism of the hydro turbine guide vane apparatus. in VIIIth International Metallurgical Congress. 2018;:1-6.
https://hdl.handle.net/21.15107/rcub_machinery_5297 .

Arsić, Miodrag, Bošnjak, Srđan, Grabulov, Vencislav, Vistać, Brane, Savić, Zoran, "Repair of damaged surfaces at the vital section of the regulatory mechanism of the hydro turbine guide vane apparatus" in VIIIth International Metallurgical Congress (2018):1-6,
https://hdl.handle.net/21.15107/rcub_machinery_5297 .

TY  - JOUR
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Mladenović, M.
AU  - Savić, Zoran
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5236
AB  - Technical diagnostics of hydromechanical equipment, is based on testing procedures
including the history of the exploitation with expert knowledge of structures and operating
conditions, as well as, on the analysis of results performed by experts with appropriate experience and knowledge in design, exploitation, maintenance, reliability, fracture mechanics etc. Degradation of properties of the material and/or welded joints of hydro-mechanical equipment is being caused by the simultaneous influence of a large number of factors. First of all, it is thought of technological, metallurgical, structural and conditions of exploitation. In this paper, the selection of methodology for the rehabilitation of hydro-mechanical equipment is presented based on the previously conducted assessment of state of equipment using the nondestructive testing methods. Repair welding, repair of damaged surfaces by cold metallization, corrections of existing structural solutions of metallic components in order to improve their technical characteristics and extend the service life are presented.
PB  - Trans Tech Publications Ltd, Switzerland
T2  - Advanced Materials Research
T1  - Use of Non-Destructive Tests for the Assessment of Integrity and Service Life of Hydro-Mechanical Equipment
EP  - 16
SP  - 9
VL  - 1146
DO  - 10.4028/www.scientific.net/AMR.1146.9
ER  - 

@article{
author = "Arsić, Miodrag and Bošnjak, Srđan and Grabulov, Vencislav and Mladenović, M. and Savić, Zoran",
year = "2018",
abstract = "Technical diagnostics of hydromechanical equipment, is based on testing procedures
including the history of the exploitation with expert knowledge of structures and operating
conditions, as well as, on the analysis of results performed by experts with appropriate experience and knowledge in design, exploitation, maintenance, reliability, fracture mechanics etc. Degradation of properties of the material and/or welded joints of hydro-mechanical equipment is being caused by the simultaneous influence of a large number of factors. First of all, it is thought of technological, metallurgical, structural and conditions of exploitation. In this paper, the selection of methodology for the rehabilitation of hydro-mechanical equipment is presented based on the previously conducted assessment of state of equipment using the nondestructive testing methods. Repair welding, repair of damaged surfaces by cold metallization, corrections of existing structural solutions of metallic components in order to improve their technical characteristics and extend the service life are presented.",
publisher = "Trans Tech Publications Ltd, Switzerland",
journal = "Advanced Materials Research",
title = "Use of Non-Destructive Tests for the Assessment of Integrity and Service Life of Hydro-Mechanical Equipment",
pages = "16-9",
volume = "1146",
doi = "10.4028/www.scientific.net/AMR.1146.9"
}

Arsić, M., Bošnjak, S., Grabulov, V., Mladenović, M.,& Savić, Z.. (2018). Use of Non-Destructive Tests for the Assessment of Integrity and Service Life of Hydro-Mechanical Equipment. in Advanced Materials Research
Trans Tech Publications Ltd, Switzerland., 1146, 9-16.
https://doi.org/10.4028/www.scientific.net/AMR.1146.9

Arsić M, Bošnjak S, Grabulov V, Mladenović M, Savić Z. Use of Non-Destructive Tests for the Assessment of Integrity and Service Life of Hydro-Mechanical Equipment. in Advanced Materials Research. 2018;1146:9-16.
doi:10.4028/www.scientific.net/AMR.1146.9 .

Arsić, Miodrag, Bošnjak, Srđan, Grabulov, Vencislav, Mladenović, M., Savić, Zoran, "Use of Non-Destructive Tests for the Assessment of Integrity and Service Life of Hydro-Mechanical Equipment" in Advanced Materials Research, 1146 (2018):9-16,
https://doi.org/10.4028/www.scientific.net/AMR.1146.9 . .

TY  - CONF
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Međo, Bojan
AU  - Mladenović, M.
AU  - Savić, Zoran
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5243
AB  - Cold metallization includes the powder or wire application on the cold surface of components
by electric arc, gas, plasma, supersonic, gas-detonation method. It could be applied on all metals except on pure copper, but not on glass and non-metallic materials. Thickness of the layer which is being deposited ranges from 0.05 to 5 mm. Porosity of the layer is 3-15 %. Temperature of the parent material does not exceed 250°C, and therefore it sustains its mechanical properties. Taking into account the above mentioned, for the repair of damaged surfaces of components of turbine and hydromechanical equipment, the methodology of the electric arc technique was developed. At first, research regarding the possibility of application of cold metallization at damaged samples of metal sheets and pipes made of structural steel was carried out, and afterwards the same methodology was performed and confirmed during the repair of damaged surfaces of the flange at the horizontal Kaplan turbine with nominal power of 28 MW (Djerdap 2). Functional role of the flange, made of steel X5CrNi18-10, is to prevent the water from entering the enclosed space of the turbine shaft.
PB  - University of Niš, Faculty of Mechanical Engineering and Society of Thermal Engineers of Serbia
C3  - Proceedings of the 18th  Symposium on Thermal Science and Engineering of Serbia – SIMTERM 2017
T1  - Repair of damaged surfaces of components of turbine and hydromechanical equipment through the use of cold metallization
EP  - 540
SP  - 536
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5243
ER  - 

@conference{
author = "Arsić, Miodrag and Bošnjak, Srđan and Grabulov, Vencislav and Međo, Bojan and Mladenović, M. and Savić, Zoran",
year = "2017",
abstract = "Cold metallization includes the powder or wire application on the cold surface of components
by electric arc, gas, plasma, supersonic, gas-detonation method. It could be applied on all metals except on pure copper, but not on glass and non-metallic materials. Thickness of the layer which is being deposited ranges from 0.05 to 5 mm. Porosity of the layer is 3-15 %. Temperature of the parent material does not exceed 250°C, and therefore it sustains its mechanical properties. Taking into account the above mentioned, for the repair of damaged surfaces of components of turbine and hydromechanical equipment, the methodology of the electric arc technique was developed. At first, research regarding the possibility of application of cold metallization at damaged samples of metal sheets and pipes made of structural steel was carried out, and afterwards the same methodology was performed and confirmed during the repair of damaged surfaces of the flange at the horizontal Kaplan turbine with nominal power of 28 MW (Djerdap 2). Functional role of the flange, made of steel X5CrNi18-10, is to prevent the water from entering the enclosed space of the turbine shaft.",
publisher = "University of Niš, Faculty of Mechanical Engineering and Society of Thermal Engineers of Serbia",
journal = "Proceedings of the 18th  Symposium on Thermal Science and Engineering of Serbia – SIMTERM 2017",
title = "Repair of damaged surfaces of components of turbine and hydromechanical equipment through the use of cold metallization",
pages = "540-536",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5243"
}

Arsić, M., Bošnjak, S., Grabulov, V., Međo, B., Mladenović, M.,& Savić, Z.. (2017). Repair of damaged surfaces of components of turbine and hydromechanical equipment through the use of cold metallization. in Proceedings of the 18th  Symposium on Thermal Science and Engineering of Serbia – SIMTERM 2017
University of Niš, Faculty of Mechanical Engineering and Society of Thermal Engineers of Serbia., 536-540.
https://hdl.handle.net/21.15107/rcub_machinery_5243

Arsić M, Bošnjak S, Grabulov V, Međo B, Mladenović M, Savić Z. Repair of damaged surfaces of components of turbine and hydromechanical equipment through the use of cold metallization. in Proceedings of the 18th  Symposium on Thermal Science and Engineering of Serbia – SIMTERM 2017. 2017;:536-540.
https://hdl.handle.net/21.15107/rcub_machinery_5243 .

Arsić, Miodrag, Bošnjak, Srđan, Grabulov, Vencislav, Međo, Bojan, Mladenović, M., Savić, Zoran, "Repair of damaged surfaces of components of turbine and hydromechanical equipment through the use of cold metallization" in Proceedings of the 18th  Symposium on Thermal Science and Engineering of Serbia – SIMTERM 2017 (2017):536-540,
https://hdl.handle.net/21.15107/rcub_machinery_5243 .

TY  - CONF
AU  - Sedmak, Aleksandar
AU  - Grabulov, Vencislav
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2692
AB  - Development of fracture mechanics in Serbia has been presented. To start with, it was the Magister thesis of Prof. Stojan Sedmak, 49 years ago (1968), as the first milestone. The stress concentration problems have been analysed and solved by means of photo elasticity. The Bovie's problem has been presented, as an illustration of the linear elastic fracture mechanics. It is worth mentioning that Acad. Hikola Hajdin, as the supervisor of the Magister thesis, has insisted on including brittle fracture theory in the thesis, although it was not originally anticipated. Later on, Prof. Stojan Sedmak has completed his doctoral thesis, in 1976. The key contributions were: Determination of KIc for Al alloys, cracked specimens used, the CMOD measurement introduced, material behaviour in presence of cracks analysed. So, well paved road has been established for all later developments, as described in the paper.
PB  - International Conference on Fracture
C3  - ICF 2017 - 14th International Conference on Fracture
T1  - Fracture mechanics in Serbia - 49 years of development
EP  - 663
SP  - 662
VL  - 2
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2692
ER  - 

@conference{
author = "Sedmak, Aleksandar and Grabulov, Vencislav",
year = "2017",
abstract = "Development of fracture mechanics in Serbia has been presented. To start with, it was the Magister thesis of Prof. Stojan Sedmak, 49 years ago (1968), as the first milestone. The stress concentration problems have been analysed and solved by means of photo elasticity. The Bovie's problem has been presented, as an illustration of the linear elastic fracture mechanics. It is worth mentioning that Acad. Hikola Hajdin, as the supervisor of the Magister thesis, has insisted on including brittle fracture theory in the thesis, although it was not originally anticipated. Later on, Prof. Stojan Sedmak has completed his doctoral thesis, in 1976. The key contributions were: Determination of KIc for Al alloys, cracked specimens used, the CMOD measurement introduced, material behaviour in presence of cracks analysed. So, well paved road has been established for all later developments, as described in the paper.",
publisher = "International Conference on Fracture",
journal = "ICF 2017 - 14th International Conference on Fracture",
title = "Fracture mechanics in Serbia - 49 years of development",
pages = "663-662",
volume = "2",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2692"
}

Sedmak, A.,& Grabulov, V.. (2017). Fracture mechanics in Serbia - 49 years of development. in ICF 2017 - 14th International Conference on Fracture
International Conference on Fracture., 2, 662-663.
https://hdl.handle.net/21.15107/rcub_machinery_2692

Sedmak A, Grabulov V. Fracture mechanics in Serbia - 49 years of development. in ICF 2017 - 14th International Conference on Fracture. 2017;2:662-663.
https://hdl.handle.net/21.15107/rcub_machinery_2692 .

Sedmak, Aleksandar, Grabulov, Vencislav, "Fracture mechanics in Serbia - 49 years of development" in ICF 2017 - 14th International Conference on Fracture, 2 (2017):662-663,
https://hdl.handle.net/21.15107/rcub_machinery_2692 .

TY  - JOUR
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Mladenović, M.
AU  - Savić, Zoran
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5239
AB  - Vertical Kaplan turbines, manufactured in Russia and with nominal power of 200 MW,
have been installed in 6 hydroelectric generating units at hydro power plant Djerdap 1.
Hydroelectric generating sets have been designed for the service life of 40 years due to structural solutions and limited possibilities of performing periodic inspections and state analyses. During the rehabilitation of the hydroelectric generating sets, non-destructive tests were performed on all components and structures in order to complete state analysis. In this paper the damages and methodology of repair welding for damaged glasses, which are the integral part of the kinematic system of runner blades, are presented.
PB  - Trans Tech Publications, Switzerland
T2  - Advanced Materials Research
T1  - Repair welding methodology for the glasses of the Kaplan turbine runner at the hydro power plant Djerdap 1
EP  - 18
SP  - 13
VL  - 1138
DO  - doi.org/10.4028/www.scientific.net/AMR.1138.13
ER  - 

@article{
author = "Arsić, Miodrag and Bošnjak, Srđan and Grabulov, Vencislav and Mladenović, M. and Savić, Zoran",
year = "2016",
abstract = "Vertical Kaplan turbines, manufactured in Russia and with nominal power of 200 MW,
have been installed in 6 hydroelectric generating units at hydro power plant Djerdap 1.
Hydroelectric generating sets have been designed for the service life of 40 years due to structural solutions and limited possibilities of performing periodic inspections and state analyses. During the rehabilitation of the hydroelectric generating sets, non-destructive tests were performed on all components and structures in order to complete state analysis. In this paper the damages and methodology of repair welding for damaged glasses, which are the integral part of the kinematic system of runner blades, are presented.",
publisher = "Trans Tech Publications, Switzerland",
journal = "Advanced Materials Research",
title = "Repair welding methodology for the glasses of the Kaplan turbine runner at the hydro power plant Djerdap 1",
pages = "18-13",
volume = "1138",
doi = "doi.org/10.4028/www.scientific.net/AMR.1138.13"
}

Arsić, M., Bošnjak, S., Grabulov, V., Mladenović, M.,& Savić, Z.. (2016). Repair welding methodology for the glasses of the Kaplan turbine runner at the hydro power plant Djerdap 1. in Advanced Materials Research
Trans Tech Publications, Switzerland., 1138, 13-18.
https://doi.org/doi.org/10.4028/www.scientific.net/AMR.1138.13

Arsić M, Bošnjak S, Grabulov V, Mladenović M, Savić Z. Repair welding methodology for the glasses of the Kaplan turbine runner at the hydro power plant Djerdap 1. in Advanced Materials Research. 2016;1138:13-18.
doi:doi.org/10.4028/www.scientific.net/AMR.1138.13 .

Arsić, Miodrag, Bošnjak, Srđan, Grabulov, Vencislav, Mladenović, M., Savić, Zoran, "Repair welding methodology for the glasses of the Kaplan turbine runner at the hydro power plant Djerdap 1" in Advanced Materials Research, 1138 (2016):13-18,
https://doi.org/doi.org/10.4028/www.scientific.net/AMR.1138.13 . .

TY  - JOUR
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Međo, Bojan
AU  - Savić, Zoran
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5262
AB  - The beam connects two bridge cranes with the overall lifting capacity of 500 t (2x250 t) and enables their simultaneous conjoint operation during the refurbishment or capital repair of hydroelectric equi-pment at the hydro power plant "Djerdap 2". Two braces are being installed instead of two hooks when that situation occurs. Braces are loaded with 250 t (2.5 MN) each, while threaded spindle is loaded with 500 t (5 MN). Integrity of structures is a relatively new scientific and engineering discipline which in a broader sense comprises state analysis, behaviour and loosening diagnostics, service life evaluation and refurbi-shment of structures, which means that, beside the usual situation in which it is necessary to evaluate the integrity of a structure when a flaw gets detected by means of non-destructive tests, this discipline also comprises structural stress state analysis. Detection of internal defects by means of ultrasonic testing was performed in order to analyze the state of braces and of the threaded spindle. On the basis of performed analytical calculations it was determined that their integrity would not be jeopardized during the refurbishment or capital repair of hydroelectric equipment at the hydro power plant "Djerdap 2".
PB  - Savez energetičara
T2  - Energija (Energija, ekonomija, ekologija)
T1  - Integrity of beam braces and threaded spindle for conjoint operation of two 5 MN bridge cranes
EP  - 324
IS  - 1-2
SP  - 319
VL  - 17
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5262
ER  - 

@article{
author = "Arsić, Miodrag and Bošnjak, Srđan and Grabulov, Vencislav and Međo, Bojan and Savić, Zoran",
year = "2015",
abstract = "The beam connects two bridge cranes with the overall lifting capacity of 500 t (2x250 t) and enables their simultaneous conjoint operation during the refurbishment or capital repair of hydroelectric equi-pment at the hydro power plant "Djerdap 2". Two braces are being installed instead of two hooks when that situation occurs. Braces are loaded with 250 t (2.5 MN) each, while threaded spindle is loaded with 500 t (5 MN). Integrity of structures is a relatively new scientific and engineering discipline which in a broader sense comprises state analysis, behaviour and loosening diagnostics, service life evaluation and refurbi-shment of structures, which means that, beside the usual situation in which it is necessary to evaluate the integrity of a structure when a flaw gets detected by means of non-destructive tests, this discipline also comprises structural stress state analysis. Detection of internal defects by means of ultrasonic testing was performed in order to analyze the state of braces and of the threaded spindle. On the basis of performed analytical calculations it was determined that their integrity would not be jeopardized during the refurbishment or capital repair of hydroelectric equipment at the hydro power plant "Djerdap 2".",
publisher = "Savez energetičara",
journal = "Energija (Energija, ekonomija, ekologija)",
title = "Integrity of beam braces and threaded spindle for conjoint operation of two 5 MN bridge cranes",
pages = "324-319",
number = "1-2",
volume = "17",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5262"
}

Arsić, M., Bošnjak, S., Grabulov, V., Međo, B.,& Savić, Z.. (2015). Integrity of beam braces and threaded spindle for conjoint operation of two 5 MN bridge cranes. in Energija (Energija, ekonomija, ekologija)
Savez energetičara., 17(1-2), 319-324.
https://hdl.handle.net/21.15107/rcub_machinery_5262

Arsić M, Bošnjak S, Grabulov V, Međo B, Savić Z. Integrity of beam braces and threaded spindle for conjoint operation of two 5 MN bridge cranes. in Energija (Energija, ekonomija, ekologija). 2015;17(1-2):319-324.
https://hdl.handle.net/21.15107/rcub_machinery_5262 .

Arsić, Miodrag, Bošnjak, Srđan, Grabulov, Vencislav, Međo, Bojan, Savić, Zoran, "Integrity of beam braces and threaded spindle for conjoint operation of two 5 MN bridge cranes" in Energija (Energija, ekonomija, ekologija), 17, no. 1-2 (2015):319-324,
https://hdl.handle.net/21.15107/rcub_machinery_5262 .

TY  - CONF
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Milovanović, Nebojša
AU  - Minić, M.
AU  - Savić, Zoran
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5246
AB  - Hydro power plant ’Pirot’, which was built in 1990, is an accumulation-derivative power plant, which consists of 2 above-ground vertical hydroelectric generating sets that contain Francis turbines with nominal power of 41,5 MW, manufactured in Czech Republic, a tunnel and a sunken pipeline with overall length of 2.030 m and diameter that ranges from 3 000 to 3 500 mm. Pipeline, made of 22 mm thick pipes, has been designed and built without anchor blocks at curvatures, which is a rarity elsewhere. Maximum pressure of 2.5 MPa occurs in front of the turbine cover.
This paper contains the analysis of the state of the generator shaft on which the mechanical damages were detected, as well as the analysis of the state of vanes of the upper and lower ventilation ring designed for air cooling of the generator rotor where corrosion, erosion and, most ofall, cavitation damages were detected, based on results of non-destructive testing (visual  testing, penetrant testing, ultrasonic testing). Procedures for the rehabilitation of damaged components without disassembling them were defined. The execution of these procedures helped in saving approximately 100 000 €.
Taking into account the period of time necessary to perform complete disassembling of components, as well as the period of time needed to perform reassembling, which is directly linked with the amount of energy the hydroelectric generating set A2 would produce during that period, the overall save would mount up to approximately 500.000 €.
PB  - Mechanical Engineering Faculty in Slavonski Brod
C3  - Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015
T1  - Repair of damages detected at the shaft and ventilation ring vanes of the hydroelectric generating set A2 generator at the hydro power plant ’Pirot’
EP  - 17
SP  - 13
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5246
ER  - 

@conference{
author = "Arsić, Miodrag and Bošnjak, Srđan and Grabulov, Vencislav and Milovanović, Nebojša and Minić, M. and Savić, Zoran",
year = "2015",
abstract = "Hydro power plant ’Pirot’, which was built in 1990, is an accumulation-derivative power plant, which consists of 2 above-ground vertical hydroelectric generating sets that contain Francis turbines with nominal power of 41,5 MW, manufactured in Czech Republic, a tunnel and a sunken pipeline with overall length of 2.030 m and diameter that ranges from 3 000 to 3 500 mm. Pipeline, made of 22 mm thick pipes, has been designed and built without anchor blocks at curvatures, which is a rarity elsewhere. Maximum pressure of 2.5 MPa occurs in front of the turbine cover.
This paper contains the analysis of the state of the generator shaft on which the mechanical damages were detected, as well as the analysis of the state of vanes of the upper and lower ventilation ring designed for air cooling of the generator rotor where corrosion, erosion and, most ofall, cavitation damages were detected, based on results of non-destructive testing (visual  testing, penetrant testing, ultrasonic testing). Procedures for the rehabilitation of damaged components without disassembling them were defined. The execution of these procedures helped in saving approximately 100 000 €.
Taking into account the period of time necessary to perform complete disassembling of components, as well as the period of time needed to perform reassembling, which is directly linked with the amount of energy the hydroelectric generating set A2 would produce during that period, the overall save would mount up to approximately 500.000 €.",
publisher = "Mechanical Engineering Faculty in Slavonski Brod",
journal = "Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015",
title = "Repair of damages detected at the shaft and ventilation ring vanes of the hydroelectric generating set A2 generator at the hydro power plant ’Pirot’",
pages = "17-13",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5246"
}

Arsić, M., Bošnjak, S., Grabulov, V., Milovanović, N., Minić, M.,& Savić, Z.. (2015). Repair of damages detected at the shaft and ventilation ring vanes of the hydroelectric generating set A2 generator at the hydro power plant ’Pirot’. in Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015
Mechanical Engineering Faculty in Slavonski Brod., 13-17.
https://hdl.handle.net/21.15107/rcub_machinery_5246

Arsić M, Bošnjak S, Grabulov V, Milovanović N, Minić M, Savić Z. Repair of damages detected at the shaft and ventilation ring vanes of the hydroelectric generating set A2 generator at the hydro power plant ’Pirot’. in Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015. 2015;:13-17.
https://hdl.handle.net/21.15107/rcub_machinery_5246 .

Arsić, Miodrag, Bošnjak, Srđan, Grabulov, Vencislav, Milovanović, Nebojša, Minić, M., Savić, Zoran, "Repair of damages detected at the shaft and ventilation ring vanes of the hydroelectric generating set A2 generator at the hydro power plant ’Pirot’" in Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015 (2015):13-17,
https://hdl.handle.net/21.15107/rcub_machinery_5246 .

TY  - CONF
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Mladenović, M.
AU  - Minić, M.
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5244
AB  - Hydro power plant Pirot, which was built in 1990, is an accumulation-derivative power plant, which consists of 2 above - ground vertical hydroelectric generating sets that contain Francis turbines with nominal power of 41,5 MW, manufactured in Czech Republic, a tunnel and a sunken pipeline with overall length of 2.030 m and diameter that ranges from 3.000 to 3.500 m. Pipes have been made of S275J2G3 steel. [1] Pipe wall is 22 mm thick. Maximum pressure of 2.5 MPa occurs in front of the turbine cover. [2]
Pipeline has been designed and built without anchor blocks at curvatures, which is rarity elsewhere. Geodetic measurements have been conducted permanently from the day the assembly was finished and pipeline was put into service, both when pipeline is empty and unloaded by hydrostatic pressure and when it is full. Analysis of obtained data regards the movements along the pipeline route showed that from year 2003 there are significantly higher differences in movements comparing the situations when the pipeline is full and when it is empty in comparison with the previous period.
Those differences primarily refers to tangential movements of vertices marked with numbers 6, 7 and 8, which, compared to the period until year 2002, are in the range from 3 mm for vertex 8 to 5 mm for vertex 6. Apart from geodetic measurements, the measurement of pipe diameter in 2 directions is also being carried out permanently. Those data show that from year 2003. the diameter in horizontal direction started to increase significantly, while at the same time the diameter in vertical direction started to decrease less significantly.
This paper contains the analysis of current state and integrity evaluation of the pipeline as a whole on the basis of results of non - destructive tests performed on the vital butt - welded joint in the curvature area at chainage 1+263 m (visual testing, magnetic particle testing, penetrant testing, ultrasonic testing, radiographic testing, metallographic replication testing).
PB  - Mechanical Engineering Faculty in Slavonski Brod
C3  - Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015
T1  - Analysis of current state and integrity evaluation of the pipeline at hydro power plant "Pirot"
EP  - 12
SP  - 5
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5244
ER  - 

@conference{
author = "Arsić, Miodrag and Bošnjak, Srđan and Grabulov, Vencislav and Mladenović, M. and Minić, M.",
year = "2015",
abstract = "Hydro power plant Pirot, which was built in 1990, is an accumulation-derivative power plant, which consists of 2 above - ground vertical hydroelectric generating sets that contain Francis turbines with nominal power of 41,5 MW, manufactured in Czech Republic, a tunnel and a sunken pipeline with overall length of 2.030 m and diameter that ranges from 3.000 to 3.500 m. Pipes have been made of S275J2G3 steel. [1] Pipe wall is 22 mm thick. Maximum pressure of 2.5 MPa occurs in front of the turbine cover. [2]
Pipeline has been designed and built without anchor blocks at curvatures, which is rarity elsewhere. Geodetic measurements have been conducted permanently from the day the assembly was finished and pipeline was put into service, both when pipeline is empty and unloaded by hydrostatic pressure and when it is full. Analysis of obtained data regards the movements along the pipeline route showed that from year 2003 there are significantly higher differences in movements comparing the situations when the pipeline is full and when it is empty in comparison with the previous period.
Those differences primarily refers to tangential movements of vertices marked with numbers 6, 7 and 8, which, compared to the period until year 2002, are in the range from 3 mm for vertex 8 to 5 mm for vertex 6. Apart from geodetic measurements, the measurement of pipe diameter in 2 directions is also being carried out permanently. Those data show that from year 2003. the diameter in horizontal direction started to increase significantly, while at the same time the diameter in vertical direction started to decrease less significantly.
This paper contains the analysis of current state and integrity evaluation of the pipeline as a whole on the basis of results of non - destructive tests performed on the vital butt - welded joint in the curvature area at chainage 1+263 m (visual testing, magnetic particle testing, penetrant testing, ultrasonic testing, radiographic testing, metallographic replication testing).",
publisher = "Mechanical Engineering Faculty in Slavonski Brod",
journal = "Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015",
title = "Analysis of current state and integrity evaluation of the pipeline at hydro power plant "Pirot"",
pages = "12-5",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5244"
}

Arsić, M., Bošnjak, S., Grabulov, V., Mladenović, M.,& Minić, M.. (2015). Analysis of current state and integrity evaluation of the pipeline at hydro power plant "Pirot". in Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015
Mechanical Engineering Faculty in Slavonski Brod., 5-12.
https://hdl.handle.net/21.15107/rcub_machinery_5244

Arsić M, Bošnjak S, Grabulov V, Mladenović M, Minić M. Analysis of current state and integrity evaluation of the pipeline at hydro power plant "Pirot". in Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015. 2015;:5-12.
https://hdl.handle.net/21.15107/rcub_machinery_5244 .

Arsić, Miodrag, Bošnjak, Srđan, Grabulov, Vencislav, Mladenović, M., Minić, M., "Analysis of current state and integrity evaluation of the pipeline at hydro power plant "Pirot"" in Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015 (2015):5-12,
https://hdl.handle.net/21.15107/rcub_machinery_5244 .

TY  - CONF
AU  - Arsić, M.
AU  - Vistać, Brane
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Savić, Zoran
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1962
AB  - Vertical Kaplan turbines, manufactured in Russia and with nominal power of 200 MW, have been installed in 6 hydroelectric generating units at ’Djerdap 1’. During the refurbishment of hydropower plant experimental non-destructive tests were performed in order to determine the state of turbine components. During the course of testing damage was detected at sleeves and welded shields of guide vanes, which occurred as a consequence of turbine shaft vibrations. 1782 mm long guide vane sleeves were made of cast steel 25L (GOST standard), 260 mm long sleeve was made of forged steel St 25 (GOST standard), while welded shields of guide vanes were made of austenitic steel 08X18H10T (GOST standard). Results of experimental tests and methodology for reparation of damaged surfaces of sleeves and welded shields of guide vanes are presented in this paper. It was necessary, due to the structural solution used for the design of guide vanes and their function during service, to define a large number of details, carefully reconsider them and carry out all activities with extreme care in order to enable the safe operation and continuous use of vanes through the use of reparation methodology for welding/surface welding of sleeves and welded shields. Overlooking, underestimation or incorrect perception of important details could cause significant problems during turbine operation.
PB  - Trans Tech Publications Ltd
C3  - Advanced Materials Research
T1  - Methodology for reparation of damaged sleeves and welded shield sections of guide vanes at hydropower plant DJERDAP 1
EP  - 13
SP  - 8
VL  - 1029
DO  - 10.4028/www.scientific.net/AMR.1029.8
ER  - 

@conference{
author = "Arsić, M. and Vistać, Brane and Bošnjak, Srđan and Grabulov, Vencislav and Savić, Zoran",
year = "2014",
abstract = "Vertical Kaplan turbines, manufactured in Russia and with nominal power of 200 MW, have been installed in 6 hydroelectric generating units at ’Djerdap 1’. During the refurbishment of hydropower plant experimental non-destructive tests were performed in order to determine the state of turbine components. During the course of testing damage was detected at sleeves and welded shields of guide vanes, which occurred as a consequence of turbine shaft vibrations. 1782 mm long guide vane sleeves were made of cast steel 25L (GOST standard), 260 mm long sleeve was made of forged steel St 25 (GOST standard), while welded shields of guide vanes were made of austenitic steel 08X18H10T (GOST standard). Results of experimental tests and methodology for reparation of damaged surfaces of sleeves and welded shields of guide vanes are presented in this paper. It was necessary, due to the structural solution used for the design of guide vanes and their function during service, to define a large number of details, carefully reconsider them and carry out all activities with extreme care in order to enable the safe operation and continuous use of vanes through the use of reparation methodology for welding/surface welding of sleeves and welded shields. Overlooking, underestimation or incorrect perception of important details could cause significant problems during turbine operation.",
publisher = "Trans Tech Publications Ltd",
journal = "Advanced Materials Research",
title = "Methodology for reparation of damaged sleeves and welded shield sections of guide vanes at hydropower plant DJERDAP 1",
pages = "13-8",
volume = "1029",
doi = "10.4028/www.scientific.net/AMR.1029.8"
}

Arsić, M., Vistać, B., Bošnjak, S., Grabulov, V.,& Savić, Z.. (2014). Methodology for reparation of damaged sleeves and welded shield sections of guide vanes at hydropower plant DJERDAP 1. in Advanced Materials Research
Trans Tech Publications Ltd., 1029, 8-13.
https://doi.org/10.4028/www.scientific.net/AMR.1029.8

Arsić M, Vistać B, Bošnjak S, Grabulov V, Savić Z. Methodology for reparation of damaged sleeves and welded shield sections of guide vanes at hydropower plant DJERDAP 1. in Advanced Materials Research. 2014;1029:8-13.
doi:10.4028/www.scientific.net/AMR.1029.8 .

Arsić, M., Vistać, Brane, Bošnjak, Srđan, Grabulov, Vencislav, Savić, Zoran, "Methodology for reparation of damaged sleeves and welded shield sections of guide vanes at hydropower plant DJERDAP 1" in Advanced Materials Research, 1029 (2014):8-13,
https://doi.org/10.4028/www.scientific.net/AMR.1029.8 . .

TY  - CONF
AU  - Arsić, M.
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Veljović, Aleksandar
AU  - Savić, Zoran
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1961
AB  - Stable supply tank, with volume V = 250 m3 and operating pressure p = 1,5 MPa, of generation unit 6 at thermal power plant 'Nikola Tesla A' in Obrenovac, is designed for water-steam working fluid. It was made of steel Č 1204 as a single-part welded structure with a single wall. Cylindrical tank shell consists of 8 segments, while torispherical deep bottoms consist of 3 segments. The tank is in the horizontal position and it lays on 4 supports. There are five manometers installed at the tank for pressure control, as well as 5 spring-loaded safety valves. In this paper results of non-destructive tests performed on the tank are presented. Mechanical damages on parent material, up to 1.5 mm deep, were detected at the outer surface of the cylindrical section of the right bottom (as seen from the boiler) and on the inner surface of the shell, as well as sporadic pitting corrosion, up to 0.5 mm deep, and 2 mm misalignment of sheet metals in areas where shell segments are joined. Crack type linear indications were detected on the surface of welded joints through the use of magnetic particle testing. Through ultrasonic and radiographic testing it was determined that the homogeneity of welded joints is satisfactory. Hardness testing was performed on all segments of the tank, and obtained values were in the range between 118 and 130 HB. Metallographic examination, performed on specimens of all segments of the tank, showed that microstructure of material is either fine-grained or striped ferrite-pearlite. On the basis of test results the repair technology for shell and bottom segments was made, while on the basis of the analytical calculation of tank strength the integrity evaluation was carried out for the upcoming period of service, depending on the category of the vessel.
PB  - Trans Tech Publications Ltd
C3  - Advanced Materials Research
T1  - Analysis of current state and integrity evaluation for the supply tank of generation unit 6 of thermal power plant Nikola Tesla ”A”, Obrenovac
EP  - 19
SP  - 14
VL  - 1029
DO  - 10.4028/www.scientific.net/AMR.1029.14
ER  - 

@conference{
author = "Arsić, M. and Bošnjak, Srđan and Grabulov, Vencislav and Veljović, Aleksandar and Savić, Zoran",
year = "2014",
abstract = "Stable supply tank, with volume V = 250 m3 and operating pressure p = 1,5 MPa, of generation unit 6 at thermal power plant 'Nikola Tesla A' in Obrenovac, is designed for water-steam working fluid. It was made of steel Č 1204 as a single-part welded structure with a single wall. Cylindrical tank shell consists of 8 segments, while torispherical deep bottoms consist of 3 segments. The tank is in the horizontal position and it lays on 4 supports. There are five manometers installed at the tank for pressure control, as well as 5 spring-loaded safety valves. In this paper results of non-destructive tests performed on the tank are presented. Mechanical damages on parent material, up to 1.5 mm deep, were detected at the outer surface of the cylindrical section of the right bottom (as seen from the boiler) and on the inner surface of the shell, as well as sporadic pitting corrosion, up to 0.5 mm deep, and 2 mm misalignment of sheet metals in areas where shell segments are joined. Crack type linear indications were detected on the surface of welded joints through the use of magnetic particle testing. Through ultrasonic and radiographic testing it was determined that the homogeneity of welded joints is satisfactory. Hardness testing was performed on all segments of the tank, and obtained values were in the range between 118 and 130 HB. Metallographic examination, performed on specimens of all segments of the tank, showed that microstructure of material is either fine-grained or striped ferrite-pearlite. On the basis of test results the repair technology for shell and bottom segments was made, while on the basis of the analytical calculation of tank strength the integrity evaluation was carried out for the upcoming period of service, depending on the category of the vessel.",
publisher = "Trans Tech Publications Ltd",
journal = "Advanced Materials Research",
title = "Analysis of current state and integrity evaluation for the supply tank of generation unit 6 of thermal power plant Nikola Tesla ”A”, Obrenovac",
pages = "19-14",
volume = "1029",
doi = "10.4028/www.scientific.net/AMR.1029.14"
}

Arsić, M., Bošnjak, S., Grabulov, V., Veljović, A.,& Savić, Z.. (2014). Analysis of current state and integrity evaluation for the supply tank of generation unit 6 of thermal power plant Nikola Tesla ”A”, Obrenovac. in Advanced Materials Research
Trans Tech Publications Ltd., 1029, 14-19.
https://doi.org/10.4028/www.scientific.net/AMR.1029.14

Arsić M, Bošnjak S, Grabulov V, Veljović A, Savić Z. Analysis of current state and integrity evaluation for the supply tank of generation unit 6 of thermal power plant Nikola Tesla ”A”, Obrenovac. in Advanced Materials Research. 2014;1029:14-19.
doi:10.4028/www.scientific.net/AMR.1029.14 .

Arsić, M., Bošnjak, Srđan, Grabulov, Vencislav, Veljović, Aleksandar, Savić, Zoran, "Analysis of current state and integrity evaluation for the supply tank of generation unit 6 of thermal power plant Nikola Tesla ”A”, Obrenovac" in Advanced Materials Research, 1029 (2014):14-19,
https://doi.org/10.4028/www.scientific.net/AMR.1029.14 . .

TY  - JOUR
AU  - Tawengi, A. S.
AU  - Sedmak, Aleksandar
AU  - Grabulov, Vencislav
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2037
AB  - In view of the importance of high strength low alloy (HSLA) steels, particularly for critical applications such as offshore platforms, pipeline and pressure vessels, this paper reports on an investigation of how to weld this type of steel without cold cracking. Using manual metal arc welding process and Tekken test (Y - Grove test) has been caned Out both to observe the cold cracking phenomenon, and to investigate the influencing factors, such as preheating temperature and energy input, as well as electrode strength and diameter. However the result of the experiments show that there is a risk of cold cracking.
PB  - Faculty of Metallurgy
T2  - Metalurgija
T1  - Cold weld cracking susceptibility of high strength low alloyed (hsla) steel nionikral 70
EP  - 626
IS  - 4
SP  - 624
VL  - 53
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2037
ER  - 

@article{
author = "Tawengi, A. S. and Sedmak, Aleksandar and Grabulov, Vencislav",
year = "2014",
abstract = "In view of the importance of high strength low alloy (HSLA) steels, particularly for critical applications such as offshore platforms, pipeline and pressure vessels, this paper reports on an investigation of how to weld this type of steel without cold cracking. Using manual metal arc welding process and Tekken test (Y - Grove test) has been caned Out both to observe the cold cracking phenomenon, and to investigate the influencing factors, such as preheating temperature and energy input, as well as electrode strength and diameter. However the result of the experiments show that there is a risk of cold cracking.",
publisher = "Faculty of Metallurgy",
journal = "Metalurgija",
title = "Cold weld cracking susceptibility of high strength low alloyed (hsla) steel nionikral 70",
pages = "626-624",
number = "4",
volume = "53",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2037"
}

Tawengi, A. S., Sedmak, A.,& Grabulov, V.. (2014). Cold weld cracking susceptibility of high strength low alloyed (hsla) steel nionikral 70. in Metalurgija
Faculty of Metallurgy., 53(4), 624-626.
https://hdl.handle.net/21.15107/rcub_machinery_2037

Tawengi AS, Sedmak A, Grabulov V. Cold weld cracking susceptibility of high strength low alloyed (hsla) steel nionikral 70. in Metalurgija. 2014;53(4):624-626.
https://hdl.handle.net/21.15107/rcub_machinery_2037 .

Tawengi, A. S., Sedmak, Aleksandar, Grabulov, Vencislav, "Cold weld cracking susceptibility of high strength low alloyed (hsla) steel nionikral 70" in Metalurgija, 53, no. 4 (2014):624-626,
https://hdl.handle.net/21.15107/rcub_machinery_2037 .

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  - https://machinery.mas.bg.ac.rs/handle/123456789/1865
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  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Mladenović, M.
AU  - Grabulov, Vencislav
AU  - Savić, Zoran
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5265
AB  - Vertical Kaplan turbines with nominal output power of 200 MW, fabricated in Russia, are installed in six hydroelectric generating units of the hydroelectric power plant 'Djerdap I'. The calculation of all basic and dynamic loads turbine parts are subjected to (runner blades, all parts of the blade rotating mechanism, runner casing, runner cover, shaft, stator cylinder of the turbine, apparatus guide etc.) has been performed during the design process, while mechanical properties of the material are just a starting point for the evaluation of the resistance to fracture. In order to perform the evaluation of integrity and estimation of service life of turbine components, it is necessary to carry out the analytical and numerical calculation of strength based on the stress state, and in some cases experimental tests in order to obtain fracture mechanics parameters. Turbine runner cover of the hydroelectric generating set A6 at HPP 'Djerdap I' has been made of cast steel 20GSL. The results of chemical composition analysis, hardness testing and metallographic tests performed on 2 samples in the longitudinal and transverse cross-section are presented in this paper, as well as mechanical tests that refer to yield strength (R0), tensile strength (R) and impact strength KCU that were carried out on four samples cut out from the turbine cover. Results of tests performed on two samples confirmed that chemical composition meets the requirements of standard GOST 977/88, and also that results of hardness tests according to Vickers (HV10) and Brinell HB (2,5/187,5/20 '), as well as that results of microhardness tests according to Vickers (HV1) meet the predefined technical requirements. It has also been established that both samples in the longitudinal cross-section have coarse grained ferrite-pearlite microstructure with large local porosity, while in the transverse cross-section both samples have dendritic ferrite-pearlite microstructure, which could cause the fracture t occur: Results of tests carried out on 4 samples showed that values of yield strength (R0,), tensile strength (&) and impact strength ICCLI for all samples meet the requirements of the standard, while values of parameters which define the plasticity of base material, elongation A5 and contraction. Z, have a large dispersion. Two samples meet the requirements of the standard (A3= 23% i A3 = 27%), while two have significantly lower values of elongation (A5 = 8% and A, = 9%), Taking into account the4fact that values ofA5and Z are not universal and that if is impossible to evaluate whether the fracture mechanism could be implemented for the runner cover material, analytical and numerical calculations ofstress state and experimental tests in order to determine the fracture mechanics parameters were carried out. Test results that referred to fatigue crack growth rate da/dN showed that internal deformations shaped as circles or ellipses (detected through ultrasonic testing), with an initial size up to 6 mm, will not disturb the reliable operation of the cover for the next 29 years.
PB  - Savez energetičara
T2  - Energija (Energija, ekonomija, ekologija)
T1  - Effect of mechanical properties of material on strength and resistance to fracture of the turbine runner cover at HPP Djerdap 1
EP  - 23
IS  - 3-4
SP  - 15
VL  - 15
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5265
ER  - 

@article{
author = "Arsić, Miodrag and Bošnjak, Srđan and Mladenović, M. and Grabulov, Vencislav and Savić, Zoran",
year = "2013",
abstract = "Vertical Kaplan turbines with nominal output power of 200 MW, fabricated in Russia, are installed in six hydroelectric generating units of the hydroelectric power plant 'Djerdap I'. The calculation of all basic and dynamic loads turbine parts are subjected to (runner blades, all parts of the blade rotating mechanism, runner casing, runner cover, shaft, stator cylinder of the turbine, apparatus guide etc.) has been performed during the design process, while mechanical properties of the material are just a starting point for the evaluation of the resistance to fracture. In order to perform the evaluation of integrity and estimation of service life of turbine components, it is necessary to carry out the analytical and numerical calculation of strength based on the stress state, and in some cases experimental tests in order to obtain fracture mechanics parameters. Turbine runner cover of the hydroelectric generating set A6 at HPP 'Djerdap I' has been made of cast steel 20GSL. The results of chemical composition analysis, hardness testing and metallographic tests performed on 2 samples in the longitudinal and transverse cross-section are presented in this paper, as well as mechanical tests that refer to yield strength (R0), tensile strength (R) and impact strength KCU that were carried out on four samples cut out from the turbine cover. Results of tests performed on two samples confirmed that chemical composition meets the requirements of standard GOST 977/88, and also that results of hardness tests according to Vickers (HV10) and Brinell HB (2,5/187,5/20 '), as well as that results of microhardness tests according to Vickers (HV1) meet the predefined technical requirements. It has also been established that both samples in the longitudinal cross-section have coarse grained ferrite-pearlite microstructure with large local porosity, while in the transverse cross-section both samples have dendritic ferrite-pearlite microstructure, which could cause the fracture t occur: Results of tests carried out on 4 samples showed that values of yield strength (R0,), tensile strength (&) and impact strength ICCLI for all samples meet the requirements of the standard, while values of parameters which define the plasticity of base material, elongation A5 and contraction. Z, have a large dispersion. Two samples meet the requirements of the standard (A3= 23% i A3 = 27%), while two have significantly lower values of elongation (A5 = 8% and A, = 9%), Taking into account the4fact that values ofA5and Z are not universal and that if is impossible to evaluate whether the fracture mechanism could be implemented for the runner cover material, analytical and numerical calculations ofstress state and experimental tests in order to determine the fracture mechanics parameters were carried out. Test results that referred to fatigue crack growth rate da/dN showed that internal deformations shaped as circles or ellipses (detected through ultrasonic testing), with an initial size up to 6 mm, will not disturb the reliable operation of the cover for the next 29 years.",
publisher = "Savez energetičara",
journal = "Energija (Energija, ekonomija, ekologija)",
title = "Effect of mechanical properties of material on strength and resistance to fracture of the turbine runner cover at HPP Djerdap 1",
pages = "23-15",
number = "3-4",
volume = "15",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5265"
}

Arsić, M., Bošnjak, S., Mladenović, M., Grabulov, V.,& Savić, Z.. (2013). Effect of mechanical properties of material on strength and resistance to fracture of the turbine runner cover at HPP Djerdap 1. in Energija (Energija, ekonomija, ekologija)
Savez energetičara., 15(3-4), 15-23.
https://hdl.handle.net/21.15107/rcub_machinery_5265

Arsić M, Bošnjak S, Mladenović M, Grabulov V, Savić Z. Effect of mechanical properties of material on strength and resistance to fracture of the turbine runner cover at HPP Djerdap 1. in Energija (Energija, ekonomija, ekologija). 2013;15(3-4):15-23.
https://hdl.handle.net/21.15107/rcub_machinery_5265 .

Arsić, Miodrag, Bošnjak, Srđan, Mladenović, M., Grabulov, Vencislav, Savić, Zoran, "Effect of mechanical properties of material on strength and resistance to fracture of the turbine runner cover at HPP Djerdap 1" in Energija (Energija, ekonomija, ekologija), 15, no. 3-4 (2013):15-23,
https://hdl.handle.net/21.15107/rcub_machinery_5265 .

TY  - JOUR
AU  - Popović, Olivera
AU  - Prokić-Cvetković, Radica
AU  - Sedmak, Aleksandar
AU  - Grabulov, Vencislav
AU  - Burzić, Zijah
AU  - Rakin, Marko
PY  - 2010
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1103
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  - Svetel, Igor
AU  - Đurović, Aleksandar
AU  - Grabulov, Vencislav
PY  - 2010
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1080
AB  - The paper describes a redesign project undertaken in a short period to adapt a software system to user needs. Additional goals of the project included a shift to Open Source software and the selection of technology to enable sustainable system development. The paper chronologically describes all phases of the project and provides reasons for all decisions taken during the development process. The paper concludes with a discussion of the merits of the redesign methodology.
PB  - ComSIS Consortium
T2  - Computer Science and Information Systems
T1  - Prompt system redesign: Shifting to open source technology to satisfy user requirements
EP  - 457
IS  - 3
SP  - 441
VL  - 7
DO  - 10.2298/CSIS090422005S
ER  - 

@article{
author = "Svetel, Igor and Đurović, Aleksandar and Grabulov, Vencislav",
year = "2010",
abstract = "The paper describes a redesign project undertaken in a short period to adapt a software system to user needs. Additional goals of the project included a shift to Open Source software and the selection of technology to enable sustainable system development. The paper chronologically describes all phases of the project and provides reasons for all decisions taken during the development process. The paper concludes with a discussion of the merits of the redesign methodology.",
publisher = "ComSIS Consortium",
journal = "Computer Science and Information Systems",
title = "Prompt system redesign: Shifting to open source technology to satisfy user requirements",
pages = "457-441",
number = "3",
volume = "7",
doi = "10.2298/CSIS090422005S"
}

Svetel, I., Đurović, A.,& Grabulov, V.. (2010). Prompt system redesign: Shifting to open source technology to satisfy user requirements. in Computer Science and Information Systems
ComSIS Consortium., 7(3), 441-457.
https://doi.org/10.2298/CSIS090422005S

Svetel I, Đurović A, Grabulov V. Prompt system redesign: Shifting to open source technology to satisfy user requirements. in Computer Science and Information Systems. 2010;7(3):441-457.
doi:10.2298/CSIS090422005S .

Svetel, Igor, Đurović, Aleksandar, Grabulov, Vencislav, "Prompt system redesign: Shifting to open source technology to satisfy user requirements" in Computer Science and Information Systems, 7, no. 3 (2010):441-457,
https://doi.org/10.2298/CSIS090422005S . .

TY  - JOUR
AU  - Sedmak, Stojan
AU  - Grabulov, Vencislav
AU  - Momčilović, Dejan B.
PY  - 2009
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7520
AB  - U različitim vremenskim periodima dolazilo je do gubitka integriteta zavarenih konstrukcija zbog razvoja proizvodnih grešaka zavarenog spoja. Mehanizmi otkaza su bili različiti i uvek su predstavljali novo iskustvo, koje je zahtevalo nova znanja i drugačiji pristup u rešavanju problema. Opsežne analize svih otkaza razmatranih u radu i izvedeni zaključci ipak nisu dovoljni da se potpuno izbegnu proizvodne nesavršenosti i obezbedi integritet zavarenih konstrukcija u eksploataciji. Direktive, standardi i preporuke za izradu zavarenih konstrukcija značajno doprinose rešavanju problema, ali ga ne mogu potpuno eliminisati zbog složenosti i velikog broja uticajnih faktora.
AB  - At different time periods, loss in structural integrity occurs from initiation of manufacture defects in the welded joint. Failure mechanisms are different and present a new experience always requiring new knowledge and approach in solving the problem. Extended analyses of all failures considered here and derived conclusions are yet not sufficient in completely avoiding manufacture imperfections and assuring in-service integrity of welded structures. Directives, standards and recommendations for manufacturing welded structures significantly contribute in problem solving which they cannot completely eliminate due to the complexity and numerous influencing factors.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Integritet i vek konstrukcija
T1  - Hronologija gubitka integriteta konstrukcija zbog grešaka izrade zavarenih konstrukcija
T1  - Chronology of lost structural integrity initiated from manufacturing defects in welded structures
EP  - 50
IS  - 1
SP  - 39
VL  - 9
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7520
ER  - 

@article{
author = "Sedmak, Stojan and Grabulov, Vencislav and Momčilović, Dejan B.",
year = "2009",
abstract = "U različitim vremenskim periodima dolazilo je do gubitka integriteta zavarenih konstrukcija zbog razvoja proizvodnih grešaka zavarenog spoja. Mehanizmi otkaza su bili različiti i uvek su predstavljali novo iskustvo, koje je zahtevalo nova znanja i drugačiji pristup u rešavanju problema. Opsežne analize svih otkaza razmatranih u radu i izvedeni zaključci ipak nisu dovoljni da se potpuno izbegnu proizvodne nesavršenosti i obezbedi integritet zavarenih konstrukcija u eksploataciji. Direktive, standardi i preporuke za izradu zavarenih konstrukcija značajno doprinose rešavanju problema, ali ga ne mogu potpuno eliminisati zbog složenosti i velikog broja uticajnih faktora., At different time periods, loss in structural integrity occurs from initiation of manufacture defects in the welded joint. Failure mechanisms are different and present a new experience always requiring new knowledge and approach in solving the problem. Extended analyses of all failures considered here and derived conclusions are yet not sufficient in completely avoiding manufacture imperfections and assuring in-service integrity of welded structures. Directives, standards and recommendations for manufacturing welded structures significantly contribute in problem solving which they cannot completely eliminate due to the complexity and numerous influencing factors.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Integritet i vek konstrukcija",
title = "Hronologija gubitka integriteta konstrukcija zbog grešaka izrade zavarenih konstrukcija, Chronology of lost structural integrity initiated from manufacturing defects in welded structures",
pages = "50-39",
number = "1",
volume = "9",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7520"
}

Sedmak, S., Grabulov, V.,& Momčilović, D. B.. (2009). Hronologija gubitka integriteta konstrukcija zbog grešaka izrade zavarenih konstrukcija. in Integritet i vek konstrukcija
Institut za ispitivanje materijala, Beograd., 9(1), 39-50.
https://hdl.handle.net/21.15107/rcub_machinery_7520

Sedmak S, Grabulov V, Momčilović DB. Hronologija gubitka integriteta konstrukcija zbog grešaka izrade zavarenih konstrukcija. in Integritet i vek konstrukcija. 2009;9(1):39-50.
https://hdl.handle.net/21.15107/rcub_machinery_7520 .

Sedmak, Stojan, Grabulov, Vencislav, Momčilović, Dejan B., "Hronologija gubitka integriteta konstrukcija zbog grešaka izrade zavarenih konstrukcija" in Integritet i vek konstrukcija, 9, no. 1 (2009):39-50,
https://hdl.handle.net/21.15107/rcub_machinery_7520 .

TY  - CONF
AU  - Grabulov, Vencislav
AU  - Jovičić, Radomir
AU  - Sedmak, Aleksandar
AU  - Odanović, Zoran
AU  - Petronić, Sanja
PY  - 2009
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/883
AB  - An analysis of the influence of heterogeneity of the ferriteaustenite welded joint on its integrity has been performed. The Charpy specimens, with notch positioned in different regions of welded joint, have been tested using the instrumented pendulum to separate crack initiation and growth energy. In all cases tested (different heat input, room and low temperature, down to -60°C), weld metal had the lowest toughness, due to the presence of S ferrite, which was not the case in the heat affected zones, having surprisingly high toughness, including both crack initiation and growth energies. Finally, J-R curves have been obtained by using standard fracture mechanics testing procedure and compared with crack driving forces, obtained numerically using King's method, enabling estimation of influence of cracks on integrity of ferriteaustenite welded joints in cylindrical pressure vessel.
C3  - Welding in the World
T1  - An analysis of the influence of weldment heterogeneity in ferrite-austenite welded structure
EP  - 563
IS  - SPECIAL ISSUE
SP  - 559
VL  - 53
UR  - https://hdl.handle.net/21.15107/rcub_machinery_883
ER  - 

@conference{
author = "Grabulov, Vencislav and Jovičić, Radomir and Sedmak, Aleksandar and Odanović, Zoran and Petronić, Sanja",
year = "2009",
abstract = "An analysis of the influence of heterogeneity of the ferriteaustenite welded joint on its integrity has been performed. The Charpy specimens, with notch positioned in different regions of welded joint, have been tested using the instrumented pendulum to separate crack initiation and growth energy. In all cases tested (different heat input, room and low temperature, down to -60°C), weld metal had the lowest toughness, due to the presence of S ferrite, which was not the case in the heat affected zones, having surprisingly high toughness, including both crack initiation and growth energies. Finally, J-R curves have been obtained by using standard fracture mechanics testing procedure and compared with crack driving forces, obtained numerically using King's method, enabling estimation of influence of cracks on integrity of ferriteaustenite welded joints in cylindrical pressure vessel.",
journal = "Welding in the World",
title = "An analysis of the influence of weldment heterogeneity in ferrite-austenite welded structure",
pages = "563-559",
number = "SPECIAL ISSUE",
volume = "53",
url = "https://hdl.handle.net/21.15107/rcub_machinery_883"
}

Grabulov, V., Jovičić, R., Sedmak, A., Odanović, Z.,& Petronić, S.. (2009). An analysis of the influence of weldment heterogeneity in ferrite-austenite welded structure. in Welding in the World, 53(SPECIAL ISSUE), 559-563.
https://hdl.handle.net/21.15107/rcub_machinery_883

Grabulov V, Jovičić R, Sedmak A, Odanović Z, Petronić S. An analysis of the influence of weldment heterogeneity in ferrite-austenite welded structure. in Welding in the World. 2009;53(SPECIAL ISSUE):559-563.
https://hdl.handle.net/21.15107/rcub_machinery_883 .

Grabulov, Vencislav, Jovičić, Radomir, Sedmak, Aleksandar, Odanović, Zoran, Petronić, Sanja, "An analysis of the influence of weldment heterogeneity in ferrite-austenite welded structure" in Welding in the World, 53, no. SPECIAL ISSUE (2009):559-563,
https://hdl.handle.net/21.15107/rcub_machinery_883 .

TY  - JOUR
AU  - Lazić, Vukić
AU  - Sedmak, Aleksandar
AU  - Aleksandrović, Srbislav
AU  - Milosavljević, Dragan I.
AU  - Čukić, Rajko D.
AU  - Grabulov, Vencislav
PY  - 2009
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/865
AB  - In this paper the problems related to the maintenance of large forging mallets of pneumatic hammers including hard facing of cracked or worn working surfaces are considered. Actually, the choice of optimum technology for the reparation of hard facing of the broken forging press frame and cracked mallet of the forging pneumatic hammer are taken into consideration.
PB  - Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek
T2  - Tehnički vjesnik
T1  - Reparation of the damaged forging hammer mallet by hard facing and weld cladding
EP  - 113
IS  - 4
SP  - 107
VL  - 16
UR  - https://hdl.handle.net/21.15107/rcub_machinery_865
ER  - 

@article{
author = "Lazić, Vukić and Sedmak, Aleksandar and Aleksandrović, Srbislav and Milosavljević, Dragan I. and Čukić, Rajko D. and Grabulov, Vencislav",
year = "2009",
abstract = "In this paper the problems related to the maintenance of large forging mallets of pneumatic hammers including hard facing of cracked or worn working surfaces are considered. Actually, the choice of optimum technology for the reparation of hard facing of the broken forging press frame and cracked mallet of the forging pneumatic hammer are taken into consideration.",
publisher = "Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek",
journal = "Tehnički vjesnik",
title = "Reparation of the damaged forging hammer mallet by hard facing and weld cladding",
pages = "113-107",
number = "4",
volume = "16",
url = "https://hdl.handle.net/21.15107/rcub_machinery_865"
}

Lazić, V., Sedmak, A., Aleksandrović, S., Milosavljević, D. I., Čukić, R. D.,& Grabulov, V.. (2009). Reparation of the damaged forging hammer mallet by hard facing and weld cladding. in Tehnički vjesnik
Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek., 16(4), 107-113.
https://hdl.handle.net/21.15107/rcub_machinery_865

Lazić V, Sedmak A, Aleksandrović S, Milosavljević DI, Čukić RD, Grabulov V. Reparation of the damaged forging hammer mallet by hard facing and weld cladding. in Tehnički vjesnik. 2009;16(4):107-113.
https://hdl.handle.net/21.15107/rcub_machinery_865 .

Lazić, Vukić, Sedmak, Aleksandar, Aleksandrović, Srbislav, Milosavljević, Dragan I., Čukić, Rajko D., Grabulov, Vencislav, "Reparation of the damaged forging hammer mallet by hard facing and weld cladding" in Tehnički vjesnik, 16, no. 4 (2009):107-113,
https://hdl.handle.net/21.15107/rcub_machinery_865 .

TY  - JOUR
AU  - Jovičić, Radomir
AU  - Sedmak, Aleksandar
AU  - Burzić, Zijah
AU  - Grabulov, Vencislav
AU  - Lozanović, Jasmina
PY  - 2008
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/794
AB  - Ovaj rad prikazuje uticaj prslina na integritet heterogenih feritno-austenitnih zavarenih spojeva primenom osnovnih principa mehanike loma. Sile rasta prsline su određene numerički primenom Kingove metode, dok je otpornost materijala na rast prsline određena eksperimentalno pomoću J-R krive. Da bi se odredila svojstva ovakvog zavarenog spoja, zavarene su ploče visokolegiranog austenitnog čelika i mikrolegiranog feritnog čelika. Eksperimentalno istraživanje, u kombinaciji sa numerički dobijenim rezultatima, omogućilo je procenu integriteta feritno-austenitnih zavarenih spojeva.
AB  - In this paper the influence of cracks on structural integrity of heterogeneous ferrite-austenite welded joints applying the basic fracture mechanics concept was analyzed. The crack driving force was obtained numerically using King's method, while materials resistance to crack growth was determined experimentally via J-integral and was given as the J-R curve. In order to find out properties of such welded joints, plates made of high alloyed austenite steel were welded to plates made of micro alloyed ferrite steel. The experimental investigation, in combination with the numerically obtained results, enabled reliable estimation of structural integrity of ferrite-austenite welded joints.
PB  - Univerzitet u Beogradu - Mašinski fakultet, Beograd
T2  - FME Transactions
T1  - Procena integriteta feritno-austenitnih zavarenih spojeva
T1  - Structural integrity assessment of ferrite-austenitic welded joints
EP  - 37
IS  - 1
SP  - 33
VL  - 36
UR  - https://hdl.handle.net/21.15107/rcub_machinery_794
ER  - 

@article{
author = "Jovičić, Radomir and Sedmak, Aleksandar and Burzić, Zijah and Grabulov, Vencislav and Lozanović, Jasmina",
year = "2008",
abstract = "Ovaj rad prikazuje uticaj prslina na integritet heterogenih feritno-austenitnih zavarenih spojeva primenom osnovnih principa mehanike loma. Sile rasta prsline su određene numerički primenom Kingove metode, dok je otpornost materijala na rast prsline određena eksperimentalno pomoću J-R krive. Da bi se odredila svojstva ovakvog zavarenog spoja, zavarene su ploče visokolegiranog austenitnog čelika i mikrolegiranog feritnog čelika. Eksperimentalno istraživanje, u kombinaciji sa numerički dobijenim rezultatima, omogućilo je procenu integriteta feritno-austenitnih zavarenih spojeva., In this paper the influence of cracks on structural integrity of heterogeneous ferrite-austenite welded joints applying the basic fracture mechanics concept was analyzed. The crack driving force was obtained numerically using King's method, while materials resistance to crack growth was determined experimentally via J-integral and was given as the J-R curve. In order to find out properties of such welded joints, plates made of high alloyed austenite steel were welded to plates made of micro alloyed ferrite steel. The experimental investigation, in combination with the numerically obtained results, enabled reliable estimation of structural integrity of ferrite-austenite welded joints.",
publisher = "Univerzitet u Beogradu - Mašinski fakultet, Beograd",
journal = "FME Transactions",
title = "Procena integriteta feritno-austenitnih zavarenih spojeva, Structural integrity assessment of ferrite-austenitic welded joints",
pages = "37-33",
number = "1",
volume = "36",
url = "https://hdl.handle.net/21.15107/rcub_machinery_794"
}

Jovičić, R., Sedmak, A., Burzić, Z., Grabulov, V.,& Lozanović, J.. (2008). Procena integriteta feritno-austenitnih zavarenih spojeva. in FME Transactions
Univerzitet u Beogradu - Mašinski fakultet, Beograd., 36(1), 33-37.
https://hdl.handle.net/21.15107/rcub_machinery_794

Jovičić R, Sedmak A, Burzić Z, Grabulov V, Lozanović J. Procena integriteta feritno-austenitnih zavarenih spojeva. in FME Transactions. 2008;36(1):33-37.
https://hdl.handle.net/21.15107/rcub_machinery_794 .

Jovičić, Radomir, Sedmak, Aleksandar, Burzić, Zijah, Grabulov, Vencislav, Lozanović, Jasmina, "Procena integriteta feritno-austenitnih zavarenih spojeva" in FME Transactions, 36, no. 1 (2008):33-37,
https://hdl.handle.net/21.15107/rcub_machinery_794 .