TY  - JOUR
AU  - Vasović, Valentina
AU  - Lukić, Jelena
AU  - Mihajlović, Draginja
AU  - Pejović, Branko
AU  - Radaković, Zoran
AU  - Radoman, Uros
AU  - Orlović, Aleksandar
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4110
AB  - The paper presents the results of a comparative study on accelerated aging of specially designed experimental transformers and their corresponding laboratory models. The experimental transformers are 300 kVA, with insulation in line with medium size and large mineral oil immersed power transformers, having different initial water contents in the standard Kraft paper insulation of ca. 1 and 4 %. These transformers were subjected to the rated current and voltage conditions, operating in the irregular parallel operation, whereby the temperature of windings were measured with fiber optics sensors and kept at 105 C for 460 days. Each transformer was equipped with a removable tank which allowed access to the outer surface of the HV windings. Laboratory experiments were simulating experimental transformers and were performed in Erlenmeyer flasks, containing oil, paper materials, copper and iron in the same proportions as in the active part of the experimental transformers. The parameters that were monitored during aging were the following: degree of polymerization of paper, hot-spot temperature of transformers, water content in paper, and water and furans content in the oil. Estimations of water content in solid insulation of experimental transformers using frequency domain spectroscopy and the Perrier-Lukic moisture equilibrium chart were performed. The experimental results show that shortening of the insulation life, defined by the value of degree of polymerization, increased 2.5 times with increasing moisture content in the cellulose from ca. 1 to 4 %. For both experimental transformers and laboratory models, the relationships between the paper degree of polymerization and the furans content for dry and wet insulation was developed and is presented in the paper.
PB  - IEEE-Inst Electrical Electronics Engineers Inc, Piscataway
T2  - IEEE Transactions on Dielectrics and Electrical Insulation
T1  - Aging of transformer insulation - experimental transformers and laboratory models with different moisture contents: Part I - DP and furans aging profiles
EP  - 1846
IS  - 6
SP  - 1840
VL  - 26
DO  - 10.1109/TDEI.2019.008183
ER  - 

@article{
author = "Vasović, Valentina and Lukić, Jelena and Mihajlović, Draginja and Pejović, Branko and Radaković, Zoran and Radoman, Uros and Orlović, Aleksandar",
year = "2019",
abstract = "The paper presents the results of a comparative study on accelerated aging of specially designed experimental transformers and their corresponding laboratory models. The experimental transformers are 300 kVA, with insulation in line with medium size and large mineral oil immersed power transformers, having different initial water contents in the standard Kraft paper insulation of ca. 1 and 4 %. These transformers were subjected to the rated current and voltage conditions, operating in the irregular parallel operation, whereby the temperature of windings were measured with fiber optics sensors and kept at 105 C for 460 days. Each transformer was equipped with a removable tank which allowed access to the outer surface of the HV windings. Laboratory experiments were simulating experimental transformers and were performed in Erlenmeyer flasks, containing oil, paper materials, copper and iron in the same proportions as in the active part of the experimental transformers. The parameters that were monitored during aging were the following: degree of polymerization of paper, hot-spot temperature of transformers, water content in paper, and water and furans content in the oil. Estimations of water content in solid insulation of experimental transformers using frequency domain spectroscopy and the Perrier-Lukic moisture equilibrium chart were performed. The experimental results show that shortening of the insulation life, defined by the value of degree of polymerization, increased 2.5 times with increasing moisture content in the cellulose from ca. 1 to 4 %. For both experimental transformers and laboratory models, the relationships between the paper degree of polymerization and the furans content for dry and wet insulation was developed and is presented in the paper.",
publisher = "IEEE-Inst Electrical Electronics Engineers Inc, Piscataway",
journal = "IEEE Transactions on Dielectrics and Electrical Insulation",
title = "Aging of transformer insulation - experimental transformers and laboratory models with different moisture contents: Part I - DP and furans aging profiles",
pages = "1846-1840",
number = "6",
volume = "26",
doi = "10.1109/TDEI.2019.008183"
}

Vasović, V., Lukić, J., Mihajlović, D., Pejović, B., Radaković, Z., Radoman, U.,& Orlović, A.. (2019). Aging of transformer insulation - experimental transformers and laboratory models with different moisture contents: Part I - DP and furans aging profiles. in IEEE Transactions on Dielectrics and Electrical Insulation
IEEE-Inst Electrical Electronics Engineers Inc, Piscataway., 26(6), 1840-1846.
https://doi.org/10.1109/TDEI.2019.008183

Vasović V, Lukić J, Mihajlović D, Pejović B, Radaković Z, Radoman U, Orlović A. Aging of transformer insulation - experimental transformers and laboratory models with different moisture contents: Part I - DP and furans aging profiles. in IEEE Transactions on Dielectrics and Electrical Insulation. 2019;26(6):1840-1846.
doi:10.1109/TDEI.2019.008183 .

Vasović, Valentina, Lukić, Jelena, Mihajlović, Draginja, Pejović, Branko, Radaković, Zoran, Radoman, Uros, Orlović, Aleksandar, "Aging of transformer insulation - experimental transformers and laboratory models with different moisture contents: Part I - DP and furans aging profiles" in IEEE Transactions on Dielectrics and Electrical Insulation, 26, no. 6 (2019):1840-1846,
https://doi.org/10.1109/TDEI.2019.008183 . .

TY  - JOUR
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Radaković, Zoran
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6015
T2  - Procedia Structural Integrity
T1  - Editorial
EP  - 2
SP  - 1
VL  - 13
DO  - 10.1016/j.prostr.2018.12.001
ER  - 

@article{
author = "Sedmak, Aleksandar and Rakin, Marko and Radaković, Zoran",
year = "2018",
journal = "Procedia Structural Integrity",
title = "Editorial",
pages = "2-1",
volume = "13",
doi = "10.1016/j.prostr.2018.12.001"
}

Sedmak, A., Rakin, M.,& Radaković, Z.. (2018). Editorial. in Procedia Structural Integrity, 13, 1-2.
https://doi.org/10.1016/j.prostr.2018.12.001

Sedmak A, Rakin M, Radaković Z. Editorial. in Procedia Structural Integrity. 2018;13:1-2.
doi:10.1016/j.prostr.2018.12.001 .

Sedmak, Aleksandar, Rakin, Marko, Radaković, Zoran, "Editorial" in Procedia Structural Integrity, 13 (2018):1-2,
https://doi.org/10.1016/j.prostr.2018.12.001 . .

TY  - JOUR
AU  - Veljić, Darko
AU  - Rakin, Marko
AU  - Perović, Milenko
AU  - Međo, Bojan
AU  - Radaković, Zoran
AU  - Todorović, Petar M.
AU  - Pavišić, Mirko N.
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2379
AB  - This paper deals with the heat generation in the Al alloy Al2024-T3 plate under different rotating speeds and plunge speeds during the plunge stage of friction stir welding. A 3-D finite element model is developed in the commercial code ABAQUS/Explicit using the arbitrary Lagrangian-Eulerian formulation, the Johnson- Cook material law, and Coulomb’s Law of friction. The heat generation in friction stir welding can be divided into two parts: frictional heat generated by the tool and heat generated by material deformation near the pin and the tool shoulder region. Numerical results obtained in this work indicate a more prominent influence from the friction-generated heat. The slip rate of the tool relative to the workpiece material is related to this portion of heat. The material velocity, on the other hand, is related to the heat generated by plastic deformation. Increasing the plunging speed of the tool decreases the friction-generated heat and increases the amount of deformation-generated heat, while increasing the tool rotating speed has the opposite influence on both heat portions. Numerical results are compared with the experimental ones, in order to validate the numerical model, and a good agreement is obtained.
PB  - Vinca Institute of Nuclear Sciences
T2  - Thermal Science
T1  - Heat generation during plunge stage in friction stir welding
EP  - 496
IS  - 2
SP  - 489
VL  - 17
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2379
ER  - 

@article{
author = "Veljić, Darko and Rakin, Marko and Perović, Milenko and Međo, Bojan and Radaković, Zoran and Todorović, Petar M. and Pavišić, Mirko N.",
year = "2013",
abstract = "This paper deals with the heat generation in the Al alloy Al2024-T3 plate under different rotating speeds and plunge speeds during the plunge stage of friction stir welding. A 3-D finite element model is developed in the commercial code ABAQUS/Explicit using the arbitrary Lagrangian-Eulerian formulation, the Johnson- Cook material law, and Coulomb’s Law of friction. The heat generation in friction stir welding can be divided into two parts: frictional heat generated by the tool and heat generated by material deformation near the pin and the tool shoulder region. Numerical results obtained in this work indicate a more prominent influence from the friction-generated heat. The slip rate of the tool relative to the workpiece material is related to this portion of heat. The material velocity, on the other hand, is related to the heat generated by plastic deformation. Increasing the plunging speed of the tool decreases the friction-generated heat and increases the amount of deformation-generated heat, while increasing the tool rotating speed has the opposite influence on both heat portions. Numerical results are compared with the experimental ones, in order to validate the numerical model, and a good agreement is obtained.",
publisher = "Vinca Institute of Nuclear Sciences",
journal = "Thermal Science",
title = "Heat generation during plunge stage in friction stir welding",
pages = "496-489",
number = "2",
volume = "17",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2379"
}

Veljić, D., Rakin, M., Perović, M., Međo, B., Radaković, Z., Todorović, P. M.,& Pavišić, M. N.. (2013). Heat generation during plunge stage in friction stir welding. in Thermal Science
Vinca Institute of Nuclear Sciences., 17(2), 489-496.
https://hdl.handle.net/21.15107/rcub_technorep_2379

Veljić D, Rakin M, Perović M, Međo B, Radaković Z, Todorović PM, Pavišić MN. Heat generation during plunge stage in friction stir welding. in Thermal Science. 2013;17(2):489-496.
https://hdl.handle.net/21.15107/rcub_technorep_2379 .

Veljić, Darko, Rakin, Marko, Perović, Milenko, Međo, Bojan, Radaković, Zoran, Todorović, Petar M., Pavišić, Mirko N., "Heat generation during plunge stage in friction stir welding" in Thermal Science, 17, no. 2 (2013):489-496,
https://hdl.handle.net/21.15107/rcub_technorep_2379 .

TY  - JOUR
AU  - Milović, Ljubica
AU  - Milošević-Mitić, Vesna
AU  - Radaković, Zoran
AU  - Anđelić, Nina
AU  - Petrovski, Blagoj
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2296
AB  - The paper illustrates the structural assessment of an investigated pressure vessel, made of low-alloyed high strength steel, with an external surface crack located on the shell wall. In order to assess the remaining strength and the resistance to stable crack growth, the J-integral is experimentally measured at operating temperature of -40°C. The compared crack driving force and material resistance to crack growth have determined the size of the zone of stable crack development, as well as the critical crack length. Also given is the pressure vessel calculation code by applying the theory of finite elements to linear-elastic material behaviour. Critical pressure values are calculated by analytical and numerical procedures and show good agreement.
AB  - U radu je prikazana ocena integriteta ispitne posude pod pritiskom izrađene od niskolegiranog čelika povišene čvrstoće sa spoljašnjom površinskom prslinom na zidu omotača. Da bi se ocenila preostala čvrstoća i otpornost na stabilan rast prsline, eksperimentalno je izmeren J-integral na radnoj temperaturi od -40°C. Poređenjem sile rasta prsline i otpornosti materijala na rast prsline određena je veličina zone stabilnog rasta prsline kao i kritična veličina prsline. Prikazan je i proračun posude pod pritiskom primenom teorije konačnih elemenata za linearno-elastično ponašanje materijala. Kritične vrednosti pritisaka izračunate analitičkim i numeričkim postupkom pokazuju dobro slaganje.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Integritet i vek konstrukcija
T1  - Assessment of pressure vessel load capacity in the presence of cracks
T1  - Procena nosivosti posude pod pritiskom u prisustvu prsline
EP  - 16
IS  - 1
SP  - 9
VL  - 13
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2296
ER  - 

@article{
author = "Milović, Ljubica and Milošević-Mitić, Vesna and Radaković, Zoran and Anđelić, Nina and Petrovski, Blagoj",
year = "2013",
abstract = "The paper illustrates the structural assessment of an investigated pressure vessel, made of low-alloyed high strength steel, with an external surface crack located on the shell wall. In order to assess the remaining strength and the resistance to stable crack growth, the J-integral is experimentally measured at operating temperature of -40°C. The compared crack driving force and material resistance to crack growth have determined the size of the zone of stable crack development, as well as the critical crack length. Also given is the pressure vessel calculation code by applying the theory of finite elements to linear-elastic material behaviour. Critical pressure values are calculated by analytical and numerical procedures and show good agreement., U radu je prikazana ocena integriteta ispitne posude pod pritiskom izrađene od niskolegiranog čelika povišene čvrstoće sa spoljašnjom površinskom prslinom na zidu omotača. Da bi se ocenila preostala čvrstoća i otpornost na stabilan rast prsline, eksperimentalno je izmeren J-integral na radnoj temperaturi od -40°C. Poređenjem sile rasta prsline i otpornosti materijala na rast prsline određena je veličina zone stabilnog rasta prsline kao i kritična veličina prsline. Prikazan je i proračun posude pod pritiskom primenom teorije konačnih elemenata za linearno-elastično ponašanje materijala. Kritične vrednosti pritisaka izračunate analitičkim i numeričkim postupkom pokazuju dobro slaganje.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Integritet i vek konstrukcija",
title = "Assessment of pressure vessel load capacity in the presence of cracks, Procena nosivosti posude pod pritiskom u prisustvu prsline",
pages = "16-9",
number = "1",
volume = "13",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2296"
}

Milović, L., Milošević-Mitić, V., Radaković, Z., Anđelić, N.,& Petrovski, B.. (2013). Assessment of pressure vessel load capacity in the presence of cracks. in Integritet i vek konstrukcija
Society for Structural Integrity and Life, Institute for Material Testing., 13(1), 9-16.
https://hdl.handle.net/21.15107/rcub_technorep_2296

Milović L, Milošević-Mitić V, Radaković Z, Anđelić N, Petrovski B. Assessment of pressure vessel load capacity in the presence of cracks. in Integritet i vek konstrukcija. 2013;13(1):9-16.
https://hdl.handle.net/21.15107/rcub_technorep_2296 .

Milović, Ljubica, Milošević-Mitić, Vesna, Radaković, Zoran, Anđelić, Nina, Petrovski, Blagoj, "Assessment of pressure vessel load capacity in the presence of cracks" in Integritet i vek konstrukcija, 13, no. 1 (2013):9-16,
https://hdl.handle.net/21.15107/rcub_technorep_2296 .

TY  - JOUR
AU  - Milović, Ljubica
AU  - Bulatović, Srđan
AU  - Aleksić, Vujadin
AU  - Radaković, Zoran
AU  - Marković, Svetislav
AU  - Sedmak, Stojan
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2050
AB  - From a fracture mechanics point of view on welded joints, it is assumed that the welded joint is pre-cracked such as that the fatigue life of the pre-cracked structure is then determined by the period of crack growth under variable load. Experimental data obtained by testing provide a substantial basis for a better understanding and an explanation of the phenomenon of material fatigue. Low cycle fatigue (LCF) occurs during the process of charging and discharging of reactors, pressure vessels and pipelines; the fatigue can be accelerated by an additional negative effect of temperature variation and the aggressive effect of the media contained inside the vessel, and during the exploitation of the equipment in the processing industry. In the present paper the results are presented of J-integral measurements at LCF of a low-alloyed high strength steel (HSLA) weld metal used in the submerged arc welding process in the manufacture of pressure vessels.
AB  - U zavarenim spojevima, sa gledišta mehanike loma, se pretpostavlja prisustvo prslina, gde se onda vek s obzirom na zamor takvih konstrukcija sa prslinama procenjuje vremenom rasta prsline pod promenljivim opterećenjem. Eksperimentalni podaci dobijeni ispitivanjem pružaju značajnu osnovu za bolje razumevanje i objašnjenje fenomena zamora materijala. Niskociklični zamor (LCF) se javlja u procesu punjenja i pražnjenja reaktora, posuda pod pritiskom i cevovoda; proces zamora može ubrzati dodatni negativan efekat promene temperature i efekat agresivne sredine sadržane u posudi, kao i tokom perioda eksploatacije opreme u procesnoj industriji. U ovom radu prikazani su rezultati merenja J integrala pri niskocikličnom zamoru (LCF) metala šava niskolegiranog čelika povišene čvrstoće (HSLA), koji se koristi u proizvodnji posuda pod pritiskom postupkom zavarivanja pod praškom.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Integritet i vek konstrukcija
T1  - Assessment of the behaviour of fatigue loaded HSLA steel welded joint by applying fracture mechanics parameters
T1  - Procena ponašanja zavarenog spoja HSLA čelika opterećenog na zamor primenom parametara mehanike loma
EP  - 179
IS  - 3
SP  - 175
VL  - 12
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2050
ER  - 

@article{
author = "Milović, Ljubica and Bulatović, Srđan and Aleksić, Vujadin and Radaković, Zoran and Marković, Svetislav and Sedmak, Stojan",
year = "2012",
abstract = "From a fracture mechanics point of view on welded joints, it is assumed that the welded joint is pre-cracked such as that the fatigue life of the pre-cracked structure is then determined by the period of crack growth under variable load. Experimental data obtained by testing provide a substantial basis for a better understanding and an explanation of the phenomenon of material fatigue. Low cycle fatigue (LCF) occurs during the process of charging and discharging of reactors, pressure vessels and pipelines; the fatigue can be accelerated by an additional negative effect of temperature variation and the aggressive effect of the media contained inside the vessel, and during the exploitation of the equipment in the processing industry. In the present paper the results are presented of J-integral measurements at LCF of a low-alloyed high strength steel (HSLA) weld metal used in the submerged arc welding process in the manufacture of pressure vessels., U zavarenim spojevima, sa gledišta mehanike loma, se pretpostavlja prisustvo prslina, gde se onda vek s obzirom na zamor takvih konstrukcija sa prslinama procenjuje vremenom rasta prsline pod promenljivim opterećenjem. Eksperimentalni podaci dobijeni ispitivanjem pružaju značajnu osnovu za bolje razumevanje i objašnjenje fenomena zamora materijala. Niskociklični zamor (LCF) se javlja u procesu punjenja i pražnjenja reaktora, posuda pod pritiskom i cevovoda; proces zamora može ubrzati dodatni negativan efekat promene temperature i efekat agresivne sredine sadržane u posudi, kao i tokom perioda eksploatacije opreme u procesnoj industriji. U ovom radu prikazani su rezultati merenja J integrala pri niskocikličnom zamoru (LCF) metala šava niskolegiranog čelika povišene čvrstoće (HSLA), koji se koristi u proizvodnji posuda pod pritiskom postupkom zavarivanja pod praškom.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Integritet i vek konstrukcija",
title = "Assessment of the behaviour of fatigue loaded HSLA steel welded joint by applying fracture mechanics parameters, Procena ponašanja zavarenog spoja HSLA čelika opterećenog na zamor primenom parametara mehanike loma",
pages = "179-175",
number = "3",
volume = "12",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2050"
}

Milović, L., Bulatović, S., Aleksić, V., Radaković, Z., Marković, S.,& Sedmak, S.. (2012). Assessment of the behaviour of fatigue loaded HSLA steel welded joint by applying fracture mechanics parameters. in Integritet i vek konstrukcija
Society for Structural Integrity and Life, Institute for Material Testing., 12(3), 175-179.
https://hdl.handle.net/21.15107/rcub_technorep_2050

Milović L, Bulatović S, Aleksić V, Radaković Z, Marković S, Sedmak S. Assessment of the behaviour of fatigue loaded HSLA steel welded joint by applying fracture mechanics parameters. in Integritet i vek konstrukcija. 2012;12(3):175-179.
https://hdl.handle.net/21.15107/rcub_technorep_2050 .

Milović, Ljubica, Bulatović, Srđan, Aleksić, Vujadin, Radaković, Zoran, Marković, Svetislav, Sedmak, Stojan, "Assessment of the behaviour of fatigue loaded HSLA steel welded joint by applying fracture mechanics parameters" in Integritet i vek konstrukcija, 12, no. 3 (2012):175-179,
https://hdl.handle.net/21.15107/rcub_technorep_2050 .

TY  - JOUR
AU  - Sedmak, Stojan
AU  - Radaković, Zoran
AU  - Milović, Ljubica
AU  - Svetel, Igor
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2048
AB  - To avoid unexpected and frequent serious failures of objects and equipment in service, and save their structural integrity, proper experimental and theoretical analyses are required, that are supported by modeling and numerical analysis. Structural failures in service have been experienced and can not be neglected. The developed procedures, based on fracture mechanics, enable to predict behaviour of a crack in a fracture process and to evaluate the safety and reliability of a structure under the applied loading in an operating environment. Regarding the significance of structural integrity, objects are classified into three groups. In the first group are objects made of stone, not sensitive to cracking, as are the preserved monuments of the ancient era. The second group includes objects prone to fracture from cracks: in this case structural integrity assessment is a requirement in order to prevent failure. In the third group are modern engineering achievements as are very large buildings (e.g. Burj Khalifa), and nano-sized objects. They both require, involving new aspects, the consideration of functionality and reliability, in addition to safety. Several examples are presented here and discussed for each group.
AB  - Da bi se izbegli neočekivani i često ozbiljni otkazi u radu objekata i opreme i sačuvao integritet konstrukcija potrebne su odgovarajuće eksperimentalne i teorijske analize, podržane modeliranjem i numeričkom analizom. Mogućnost otkaza konstrukcije u radu se ne može zanemariti, jer se oni u praksi javljaju. Postupci, razvijeni na osnovu mehanike loma, omogućavaju da se predvidi ponašanje prsline u procesu loma i da se oceni sigurnost i pouzdanost konstrukcije pri opterećenju u radnim uslovima. Objekti su podeljeni u tri grupe s obzirom na značaj integriteta konstrukcije. U prvoj grupi su objekti, uglavnom izrađeni od kamena, koji nisu osetljivi na prsline, kao što su očuvani arheološki spomenici. Druga grupa uključuje konstrukcije sklone razvoju loma usled prslina: za njih se zahteva ocena integriteta da bi se sprečio otkaz. U trećoj grupi su nova tehnička dostignuća, kao što su velike građevine (na primer Burdž Kalifa) i objekti nano veličina. Zbog toga što se u oba slučaja unose novi aspekti, i objekti velikih i vrlo malih dimenzija zahtevaju da se, sem sigurnosti, razmotre funkcionalnost i pouzdanost. Za svaku grupu je nekoliko primera prikazano i diskutovano.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Integritet i vek konstrukcija
T1  - Significance and applicability of structural integrity assessment
T1  - Značaj i primenljivost ocene integriteta konstrukcija
EP  - 30
IS  - 1
SP  - 3
VL  - 12
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2048
ER  - 

@article{
author = "Sedmak, Stojan and Radaković, Zoran and Milović, Ljubica and Svetel, Igor",
year = "2012",
abstract = "To avoid unexpected and frequent serious failures of objects and equipment in service, and save their structural integrity, proper experimental and theoretical analyses are required, that are supported by modeling and numerical analysis. Structural failures in service have been experienced and can not be neglected. The developed procedures, based on fracture mechanics, enable to predict behaviour of a crack in a fracture process and to evaluate the safety and reliability of a structure under the applied loading in an operating environment. Regarding the significance of structural integrity, objects are classified into three groups. In the first group are objects made of stone, not sensitive to cracking, as are the preserved monuments of the ancient era. The second group includes objects prone to fracture from cracks: in this case structural integrity assessment is a requirement in order to prevent failure. In the third group are modern engineering achievements as are very large buildings (e.g. Burj Khalifa), and nano-sized objects. They both require, involving new aspects, the consideration of functionality and reliability, in addition to safety. Several examples are presented here and discussed for each group., Da bi se izbegli neočekivani i često ozbiljni otkazi u radu objekata i opreme i sačuvao integritet konstrukcija potrebne su odgovarajuće eksperimentalne i teorijske analize, podržane modeliranjem i numeričkom analizom. Mogućnost otkaza konstrukcije u radu se ne može zanemariti, jer se oni u praksi javljaju. Postupci, razvijeni na osnovu mehanike loma, omogućavaju da se predvidi ponašanje prsline u procesu loma i da se oceni sigurnost i pouzdanost konstrukcije pri opterećenju u radnim uslovima. Objekti su podeljeni u tri grupe s obzirom na značaj integriteta konstrukcije. U prvoj grupi su objekti, uglavnom izrađeni od kamena, koji nisu osetljivi na prsline, kao što su očuvani arheološki spomenici. Druga grupa uključuje konstrukcije sklone razvoju loma usled prslina: za njih se zahteva ocena integriteta da bi se sprečio otkaz. U trećoj grupi su nova tehnička dostignuća, kao što su velike građevine (na primer Burdž Kalifa) i objekti nano veličina. Zbog toga što se u oba slučaja unose novi aspekti, i objekti velikih i vrlo malih dimenzija zahtevaju da se, sem sigurnosti, razmotre funkcionalnost i pouzdanost. Za svaku grupu je nekoliko primera prikazano i diskutovano.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Integritet i vek konstrukcija",
title = "Significance and applicability of structural integrity assessment, Značaj i primenljivost ocene integriteta konstrukcija",
pages = "30-3",
number = "1",
volume = "12",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2048"
}

Sedmak, S., Radaković, Z., Milović, L.,& Svetel, I.. (2012). Significance and applicability of structural integrity assessment. in Integritet i vek konstrukcija
Society for Structural Integrity and Life, Institute for Material Testing., 12(1), 3-30.
https://hdl.handle.net/21.15107/rcub_technorep_2048

Sedmak S, Radaković Z, Milović L, Svetel I. Significance and applicability of structural integrity assessment. in Integritet i vek konstrukcija. 2012;12(1):3-30.
https://hdl.handle.net/21.15107/rcub_technorep_2048 .

Sedmak, Stojan, Radaković, Zoran, Milović, Ljubica, Svetel, Igor, "Significance and applicability of structural integrity assessment" in Integritet i vek konstrukcija, 12, no. 1 (2012):3-30,
https://hdl.handle.net/21.15107/rcub_technorep_2048 .

TY  - JOUR
AU  - Milović, Ljubica
AU  - Vuherer, Tomaz
AU  - Radaković, Zoran
AU  - Petrovski, Blagoj
AU  - Janković, Miodrag
AU  - Zrilić, Milorad
AU  - Daničić, Darko
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1840
AB  - The structural integrity and operational safety of welded pressure vessels primarily depends on the behaviour of weldments. In spite of all efforts in material production and improvements in welding techniques, including strict codes, requirements and directives, the crack occurrence in welded structures cannot be completely excluded. This is why fracture mechanics analysis is inevitable in the structural integrity assessment of all welded structures. Examples of practical application of fracture mechanics parameters in cracked pressure vessel structural integrity are considered. This paper shows the determination of parameters of the fatigue crack for constituents of welded joints produced of high strength low alloyed steel Nionikral-70 (yield strength 700 MPa). Results have shown that the position of notch and crack initiation affect the values of the stress intensity range of fatigue threshold DKth and parameters in the Paris' equation.
AB  - Integritet konstrukcije i sigurnost u radu zavarenih posuda pod pritiskom uglavnom zavisi od ponašanja zavarenih spojeva. Pored svih uloženih napora u proizvodnji i poboljšanja postupaka zavarivanja, uključujući i stroge standarde, zahteve i smernice, pojava prslina u zavarenim konstrukcijama se ne može u potpunosti izbeći. Zato je analiza mehanike loma neophodna u proceni integriteta svih zavarenih konstrukcija. Razmotreni su primeri praktične primene parametara mehanike loma u integritetu posuda pod pritiskom sa prslinom. Rad prikazuje određivanje parametara zamorne prsline za konstituente zavarenih spojeva izrađenih od niskolegiranog čelika povišene čvrstoće Nionikral-70 (napona tečenja 700 MPa). Rezultati pokazuju da položaj zareza i inicijacija prsline utiču na vrednosti raspona napona za granicu zamora DKth i na parametre Parisove relacije.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Integritet i vek konstrukcija
T1  - Determination of fatigue crack growth parameters in welded joint of HSLA steel
T1  - Određivanje parametara zamornog rasta prsline kod zavarenih spojeva od HSLA čelika
EP  - 187
IS  - 3
SP  - 183
VL  - 11
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1840
ER  - 

@article{
author = "Milović, Ljubica and Vuherer, Tomaz and Radaković, Zoran and Petrovski, Blagoj and Janković, Miodrag and Zrilić, Milorad and Daničić, Darko",
year = "2011",
abstract = "The structural integrity and operational safety of welded pressure vessels primarily depends on the behaviour of weldments. In spite of all efforts in material production and improvements in welding techniques, including strict codes, requirements and directives, the crack occurrence in welded structures cannot be completely excluded. This is why fracture mechanics analysis is inevitable in the structural integrity assessment of all welded structures. Examples of practical application of fracture mechanics parameters in cracked pressure vessel structural integrity are considered. This paper shows the determination of parameters of the fatigue crack for constituents of welded joints produced of high strength low alloyed steel Nionikral-70 (yield strength 700 MPa). Results have shown that the position of notch and crack initiation affect the values of the stress intensity range of fatigue threshold DKth and parameters in the Paris' equation., Integritet konstrukcije i sigurnost u radu zavarenih posuda pod pritiskom uglavnom zavisi od ponašanja zavarenih spojeva. Pored svih uloženih napora u proizvodnji i poboljšanja postupaka zavarivanja, uključujući i stroge standarde, zahteve i smernice, pojava prslina u zavarenim konstrukcijama se ne može u potpunosti izbeći. Zato je analiza mehanike loma neophodna u proceni integriteta svih zavarenih konstrukcija. Razmotreni su primeri praktične primene parametara mehanike loma u integritetu posuda pod pritiskom sa prslinom. Rad prikazuje određivanje parametara zamorne prsline za konstituente zavarenih spojeva izrađenih od niskolegiranog čelika povišene čvrstoće Nionikral-70 (napona tečenja 700 MPa). Rezultati pokazuju da položaj zareza i inicijacija prsline utiču na vrednosti raspona napona za granicu zamora DKth i na parametre Parisove relacije.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Integritet i vek konstrukcija",
title = "Determination of fatigue crack growth parameters in welded joint of HSLA steel, Određivanje parametara zamornog rasta prsline kod zavarenih spojeva od HSLA čelika",
pages = "187-183",
number = "3",
volume = "11",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1840"
}

Milović, L., Vuherer, T., Radaković, Z., Petrovski, B., Janković, M., Zrilić, M.,& Daničić, D.. (2011). Determination of fatigue crack growth parameters in welded joint of HSLA steel. in Integritet i vek konstrukcija
Society for Structural Integrity and Life, Institute for Material Testing., 11(3), 183-187.
https://hdl.handle.net/21.15107/rcub_technorep_1840

Milović L, Vuherer T, Radaković Z, Petrovski B, Janković M, Zrilić M, Daničić D. Determination of fatigue crack growth parameters in welded joint of HSLA steel. in Integritet i vek konstrukcija. 2011;11(3):183-187.
https://hdl.handle.net/21.15107/rcub_technorep_1840 .

Milović, Ljubica, Vuherer, Tomaz, Radaković, Zoran, Petrovski, Blagoj, Janković, Miodrag, Zrilić, Milorad, Daničić, Darko, "Determination of fatigue crack growth parameters in welded joint of HSLA steel" in Integritet i vek konstrukcija, 11, no. 3 (2011):183-187,
https://hdl.handle.net/21.15107/rcub_technorep_1840 .

TY  - JOUR
AU  - Arsić, Miodrag
AU  - Veljović, Aleksandar
AU  - Rakin, Marko
AU  - Radaković, Zoran
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1298
AB  - The load carrying structure of belt conveyors, a system with excessive elastic properties of its parts, is subjected to complex loads of dynamic character. Assessment of state of the drive and conveyor structure is possible only based on certain investigations in operating conditions. This paper presents results of tensometric measurements of deformations for various load regimes on belt conveyor drive drum shaft. Thereupon, on the basis of the obtained stress-time dependence, the functions of stress distribution and corresponding loading spectra are defined that enable a quantitative estimation of structural component behavior in the range of material fatigue strength. Also, it is shown how results of the measurements may be used for evaluating the lifespan of driving speed reducer elements. .
AB  - Noseća konstrukcija trakastih transportera, koja pred-stavlja sistem sa izraženim elastičnim svojstvima njegovih delova, izložena je složenim opterećenjima dinamičkog karaktera. Ocena stanja pogona i konstrukcija trakastih transportera moguća je jedino na osnovu određenih ispitivanja u radnim uslovima. U radu su prikazani rezultati tenzometrijskih merenja deformacija na vratilu pogonskog bubnja trakastog transportera, za različite režime opterećenja. Zatim su na osnovu utvrđenih zavisnosti naprezanje-vreme definisane funkcije raspodele napona i odgovarajući spektari opterećenja, koji omogućuju kvantitativnu ocenu ponašanja komponenata konstrukcije u području zamorne čvrstoće materijala. Takođe, prikazano je kako se rezultati merenja mogu iskoristiti za procenu veka elemenata pogonskog reduktora. .
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Integritet i vek konstrukcija
T1  - Possibility of life assessing the speed reducer for belt conveyor drive by applying tensometric measurements
T1  - Mogućnost procene veka prenosnika reduktora za pogon trakastih transportera primenom tenzometrijskih merenja
EP  - 164
IS  - 3
SP  - 159
VL  - 8
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1298
ER  - 

@article{
author = "Arsić, Miodrag and Veljović, Aleksandar and Rakin, Marko and Radaković, Zoran",
year = "2008",
abstract = "The load carrying structure of belt conveyors, a system with excessive elastic properties of its parts, is subjected to complex loads of dynamic character. Assessment of state of the drive and conveyor structure is possible only based on certain investigations in operating conditions. This paper presents results of tensometric measurements of deformations for various load regimes on belt conveyor drive drum shaft. Thereupon, on the basis of the obtained stress-time dependence, the functions of stress distribution and corresponding loading spectra are defined that enable a quantitative estimation of structural component behavior in the range of material fatigue strength. Also, it is shown how results of the measurements may be used for evaluating the lifespan of driving speed reducer elements. ., Noseća konstrukcija trakastih transportera, koja pred-stavlja sistem sa izraženim elastičnim svojstvima njegovih delova, izložena je složenim opterećenjima dinamičkog karaktera. Ocena stanja pogona i konstrukcija trakastih transportera moguća je jedino na osnovu određenih ispitivanja u radnim uslovima. U radu su prikazani rezultati tenzometrijskih merenja deformacija na vratilu pogonskog bubnja trakastog transportera, za različite režime opterećenja. Zatim su na osnovu utvrđenih zavisnosti naprezanje-vreme definisane funkcije raspodele napona i odgovarajući spektari opterećenja, koji omogućuju kvantitativnu ocenu ponašanja komponenata konstrukcije u području zamorne čvrstoće materijala. Takođe, prikazano je kako se rezultati merenja mogu iskoristiti za procenu veka elemenata pogonskog reduktora. .",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Integritet i vek konstrukcija",
title = "Possibility of life assessing the speed reducer for belt conveyor drive by applying tensometric measurements, Mogućnost procene veka prenosnika reduktora za pogon trakastih transportera primenom tenzometrijskih merenja",
pages = "164-159",
number = "3",
volume = "8",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1298"
}

Arsić, M., Veljović, A., Rakin, M.,& Radaković, Z.. (2008). Possibility of life assessing the speed reducer for belt conveyor drive by applying tensometric measurements. in Integritet i vek konstrukcija
Society for Structural Integrity and Life, Institute for Material Testing., 8(3), 159-164.
https://hdl.handle.net/21.15107/rcub_technorep_1298

Arsić M, Veljović A, Rakin M, Radaković Z. Possibility of life assessing the speed reducer for belt conveyor drive by applying tensometric measurements. in Integritet i vek konstrukcija. 2008;8(3):159-164.
https://hdl.handle.net/21.15107/rcub_technorep_1298 .

Arsić, Miodrag, Veljović, Aleksandar, Rakin, Marko, Radaković, Zoran, "Possibility of life assessing the speed reducer for belt conveyor drive by applying tensometric measurements" in Integritet i vek konstrukcija, 8, no. 3 (2008):159-164,
https://hdl.handle.net/21.15107/rcub_technorep_1298 .