TY  - JOUR
AU  - Petronić, Sanja
AU  - Burzić, Meri
AU  - Milovanović, Dubravka
AU  - Čolić, Katarina
AU  - Radovanović, Željko
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2956
AB  - Laser welding is a welding process with a high energy density and numerous advantages over conventional welding methods (narrow heat affected zone, lower heat input, less distortion, and the like.) Mechanical treatment laser is an innovative technique for improving the properties of fatigue resistance, abrasion and corrosion resistance. In this paper, mechanically processed by laser two groups of samples; base materials and laser welded joints. Sheets made of Ni superalloy 2mm thick -millisecond Nd: YAG laser, while the mechanical treatment made picosecond Nd: YAG laser. Welds are tensile tested, and microstructure was observed by optical and scanning electron microscopy. The microhardness was measured by Vickers method with a load of 10 N.
AB  - Lasersko zavarivanje je proces zavarivanja sa velikom gustinom energije i mnogobrojnim prednostima u odnosu na konvencionalne metode zavarivanja (uska zona uticaja toplote, manji unos toplote, manja distorzija i sl.) Mehanička obrada laserom je inovativna tehnika kojom se poboljšavaju karakteristike otpornosti na zamor, habanje i otpornost na koroziju. U ovom radu, mehanički su obrađene laserom dve grupe uzoraka; osnovnog materijala i laserski zavarenih spojeva. Limovi superlegure debljine 2mm su zavareni milisekundnim Nd:YAG laserom, dok je mehanička obada obavljena pikosekundnim Nd:YAG laserom. Zavareni spojevi su ispitani zatezanjem, a mikrostruktura je posmatrana optičkim i skenirajućim elektronskim mikroskopom. Mikrotvrdoća je merena po Vikersu sa opterećenjem od 10 N.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Picosecond laser shock peening of base Nimonic 263 material and laser welded Nimonic 263 alloy
T1  - Mehanička obrada pikosekundnim laserom osnovnog materijala i zavarenih spojeva legure Nimonik 263
EP  - 155
IS  - 4
SP  - 149
VL  - 60
DO  - 10.5937/zzk1504149P
ER  - 

@article{
author = "Petronić, Sanja and Burzić, Meri and Milovanović, Dubravka and Čolić, Katarina and Radovanović, Željko",
year = "2015",
abstract = "Laser welding is a welding process with a high energy density and numerous advantages over conventional welding methods (narrow heat affected zone, lower heat input, less distortion, and the like.) Mechanical treatment laser is an innovative technique for improving the properties of fatigue resistance, abrasion and corrosion resistance. In this paper, mechanically processed by laser two groups of samples; base materials and laser welded joints. Sheets made of Ni superalloy 2mm thick -millisecond Nd: YAG laser, while the mechanical treatment made picosecond Nd: YAG laser. Welds are tensile tested, and microstructure was observed by optical and scanning electron microscopy. The microhardness was measured by Vickers method with a load of 10 N., Lasersko zavarivanje je proces zavarivanja sa velikom gustinom energije i mnogobrojnim prednostima u odnosu na konvencionalne metode zavarivanja (uska zona uticaja toplote, manji unos toplote, manja distorzija i sl.) Mehanička obrada laserom je inovativna tehnika kojom se poboljšavaju karakteristike otpornosti na zamor, habanje i otpornost na koroziju. U ovom radu, mehanički su obrađene laserom dve grupe uzoraka; osnovnog materijala i laserski zavarenih spojeva. Limovi superlegure debljine 2mm su zavareni milisekundnim Nd:YAG laserom, dok je mehanička obada obavljena pikosekundnim Nd:YAG laserom. Zavareni spojevi su ispitani zatezanjem, a mikrostruktura je posmatrana optičkim i skenirajućim elektronskim mikroskopom. Mikrotvrdoća je merena po Vikersu sa opterećenjem od 10 N.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Picosecond laser shock peening of base Nimonic 263 material and laser welded Nimonic 263 alloy, Mehanička obrada pikosekundnim laserom osnovnog materijala i zavarenih spojeva legure Nimonik 263",
pages = "155-149",
number = "4",
volume = "60",
doi = "10.5937/zzk1504149P"
}

Petronić, S., Burzić, M., Milovanović, D., Čolić, K.,& Radovanović, Ž.. (2015). Picosecond laser shock peening of base Nimonic 263 material and laser welded Nimonic 263 alloy. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 60(4), 149-155.
https://doi.org/10.5937/zzk1504149P

Petronić S, Burzić M, Milovanović D, Čolić K, Radovanović Ž. Picosecond laser shock peening of base Nimonic 263 material and laser welded Nimonic 263 alloy. in Zavarivanje i zavarene konstrukcije. 2015;60(4):149-155.
doi:10.5937/zzk1504149P .

Petronić, Sanja, Burzić, Meri, Milovanović, Dubravka, Čolić, Katarina, Radovanović, Željko, "Picosecond laser shock peening of base Nimonic 263 material and laser welded Nimonic 263 alloy" in Zavarivanje i zavarene konstrukcije, 60, no. 4 (2015):149-155,
https://doi.org/10.5937/zzk1504149P . .

TY  - JOUR
AU  - Doncheva, Elisaveta
AU  - Međo, Bojan
AU  - Sedmak, Aleksandar
PY  - 2015
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2937
AB  - This study deals with numerical simulations based on elastic-plastic finite element method for nonlinear stress analyses on pre-cracked tensile specimens with high strength properties. The influence of crack geometry on fracture resistance properties is considered with numerical analysis on models with two different cracks. Results on fracture resistance parameters are obtained for both simulated tensile panels with different crack lengths and width, referred as short and long crack. The obtained numerical results for crack resistance behaviour of tensile specimens are compared with data results from existing experimental investigations on specimens with same shape and material properties. Also, comparison is made with results obtained from similar standard experimental procedure. It is shown, that a proper combination of numerical and experimental procedures can lead research to significantly accurate results when investigating the fracture response of materials.
AB  - U ovom radu se razmatraju numeričke simulacije na bazi elastoplastičnih konačnih elemenata kod nelinearnih naponskih analiza zateznih epruveta sa prslinom, od materijala povišene čvrstoće. Uticaj geometrije prsline na otpornost prema lomu je razmatran u numeričkoj analizi na modelima sa dve različite prsline. Rezultati parametara loma su dobijeni kako za simulaciju zateznih ploča različitih dužina prsline i širina, koje čine tzv. kratke i duge prsline. Poređenjem dobijenih numeričkih rezultata za otpornost na lom zateznih epruveta sa rezultatima odgovarajućih eksperimentalnih ispitivanja epruveta istih oblika i osobina materijala, kao i poređenje sa rezultatima dobijenim sličnim standardnim eksperimentalnim postupcima, pokazuje se da pravilna kombinacija numeričkih i eksperimentalnih procedura može usmeriti istraživanje u dobijanju mnogo preciznijih rezultata u istraživanju svojstava otpornosti na lom materijala.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Integritet i vek konstrukcija
T1  - Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel
T1  - Analiza parametara otpornosti na lom metodom konačnih elemenata, kod stacionarnih polueliptičnih prslina u čeliku povišene čvrstoće
EP  - 134
IS  - 3
SP  - 131
VL  - 15
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2937
ER  - 

@article{
author = "Doncheva, Elisaveta and Međo, Bojan and Sedmak, Aleksandar",
year = "2015",
abstract = "This study deals with numerical simulations based on elastic-plastic finite element method for nonlinear stress analyses on pre-cracked tensile specimens with high strength properties. The influence of crack geometry on fracture resistance properties is considered with numerical analysis on models with two different cracks. Results on fracture resistance parameters are obtained for both simulated tensile panels with different crack lengths and width, referred as short and long crack. The obtained numerical results for crack resistance behaviour of tensile specimens are compared with data results from existing experimental investigations on specimens with same shape and material properties. Also, comparison is made with results obtained from similar standard experimental procedure. It is shown, that a proper combination of numerical and experimental procedures can lead research to significantly accurate results when investigating the fracture response of materials., U ovom radu se razmatraju numeričke simulacije na bazi elastoplastičnih konačnih elemenata kod nelinearnih naponskih analiza zateznih epruveta sa prslinom, od materijala povišene čvrstoće. Uticaj geometrije prsline na otpornost prema lomu je razmatran u numeričkoj analizi na modelima sa dve različite prsline. Rezultati parametara loma su dobijeni kako za simulaciju zateznih ploča različitih dužina prsline i širina, koje čine tzv. kratke i duge prsline. Poređenjem dobijenih numeričkih rezultata za otpornost na lom zateznih epruveta sa rezultatima odgovarajućih eksperimentalnih ispitivanja epruveta istih oblika i osobina materijala, kao i poređenje sa rezultatima dobijenim sličnim standardnim eksperimentalnim postupcima, pokazuje se da pravilna kombinacija numeričkih i eksperimentalnih procedura može usmeriti istraživanje u dobijanju mnogo preciznijih rezultata u istraživanju svojstava otpornosti na lom materijala.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Integritet i vek konstrukcija",
title = "Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel, Analiza parametara otpornosti na lom metodom konačnih elemenata, kod stacionarnih polueliptičnih prslina u čeliku povišene čvrstoće",
pages = "134-131",
number = "3",
volume = "15",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2937"
}

Doncheva, E., Međo, B.,& Sedmak, A.. (2015). Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel. in Integritet i vek konstrukcija
Society for Structural Integrity and Life, Institute for Material Testing., 15(3), 131-134.
https://hdl.handle.net/21.15107/rcub_technorep_2937

Doncheva E, Međo B, Sedmak A. Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel. in Integritet i vek konstrukcija. 2015;15(3):131-134.
https://hdl.handle.net/21.15107/rcub_technorep_2937 .

Doncheva, Elisaveta, Međo, Bojan, Sedmak, Aleksandar, "Finite element analysis of fracture resistance parameters for stationary semi-elliptical surface cracks in high strength steel" in Integritet i vek konstrukcija, 15, no. 3 (2015):131-134,
https://hdl.handle.net/21.15107/rcub_technorep_2937 .

TY  - JOUR
AU  - Burzić, Meri
AU  - Prokić-Cvetković, Radica
AU  - Manjgo, Mersida
AU  - Milović, Ljubica
AU  - Arsić, Miodrag
AU  - Popović, Olivera
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2052
AB  - The effect of vibration on the variation of residual stresses in butt-welded steel plates and on the impact energy in characteristic zones of a welded joint is analysed in this paper. An important segment occurring as a result of welding is the phenomenon of residual stresses in the welded joint zone. Residual stress measurements are conducted both on butt-welded plates that were not vibrated during welding and on plates simultaneously welded and vibrated. It is concluded that the vibration process noticeably decreases the level of stresses in the zone of the butt weld, i.e. the result is relaxation and plane stress state. Impact energy tests have shown that vibration favourably affects the total impact energy by increasing it both in specimens notched in the weld metal (WM) and in the heat-affected zone (HAZ). It is also concluded that the correlation between the distribution of crack initiation- and crack propagation energy, as vital components in the assessment of welded joint ductility, is improved.
AB  - Istraživanje uticaja vibracija na promenu zaostalih napona kod sučeono zavarenih čeličnih ploča i promena energije udara u karakterističnim zonama zavarenog spoja analizirana je u ovom radu. Bitan segment, koji se javlja kao posledica zavarivanja, je pojava zaostalih napona u zoni zavarenog spoja. Merenje zaostalih napona je rađeno na sučeono zavarenim pločama koje nisu vibrirane u toku zavarivanja i kod ploča koje su istovremeno zavarivane i vibrirane. Uočeno je da proces vibracija znatno smanjuje nivo zaostalih napona u zoni sučeono zavarenog spoja, odnosno, dolazi do relaksacije i uravnoteženja stanja napona. Ispitivanja energije udara su pokazala da vibracije pozitivno utiču na povećanje ukupne energije udara i kod epruveta sa zarezom u metalu šava i u zoni uticaja toplote. Uočen je i bolji odnos raspodele energije stvaranja i energije širenja prsline, kao važnih komponenti u oceni plastičnosti zavarenog spoja.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Integritet i vek konstrukcija
T1  - Effect of vibration on the variation of residual stresses and impact energy in butt-welded joints
T1  - Uticaj vibracija na promenu zaostalih napona i energije udara kod sučeono zavarenih spojeva
EP  - 220
IS  - 3
SP  - 215
VL  - 12
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2052
ER  - 

@article{
author = "Burzić, Meri and Prokić-Cvetković, Radica and Manjgo, Mersida and Milović, Ljubica and Arsić, Miodrag and Popović, Olivera",
year = "2012",
abstract = "The effect of vibration on the variation of residual stresses in butt-welded steel plates and on the impact energy in characteristic zones of a welded joint is analysed in this paper. An important segment occurring as a result of welding is the phenomenon of residual stresses in the welded joint zone. Residual stress measurements are conducted both on butt-welded plates that were not vibrated during welding and on plates simultaneously welded and vibrated. It is concluded that the vibration process noticeably decreases the level of stresses in the zone of the butt weld, i.e. the result is relaxation and plane stress state. Impact energy tests have shown that vibration favourably affects the total impact energy by increasing it both in specimens notched in the weld metal (WM) and in the heat-affected zone (HAZ). It is also concluded that the correlation between the distribution of crack initiation- and crack propagation energy, as vital components in the assessment of welded joint ductility, is improved., Istraživanje uticaja vibracija na promenu zaostalih napona kod sučeono zavarenih čeličnih ploča i promena energije udara u karakterističnim zonama zavarenog spoja analizirana je u ovom radu. Bitan segment, koji se javlja kao posledica zavarivanja, je pojava zaostalih napona u zoni zavarenog spoja. Merenje zaostalih napona je rađeno na sučeono zavarenim pločama koje nisu vibrirane u toku zavarivanja i kod ploča koje su istovremeno zavarivane i vibrirane. Uočeno je da proces vibracija znatno smanjuje nivo zaostalih napona u zoni sučeono zavarenog spoja, odnosno, dolazi do relaksacije i uravnoteženja stanja napona. Ispitivanja energije udara su pokazala da vibracije pozitivno utiču na povećanje ukupne energije udara i kod epruveta sa zarezom u metalu šava i u zoni uticaja toplote. Uočen je i bolji odnos raspodele energije stvaranja i energije širenja prsline, kao važnih komponenti u oceni plastičnosti zavarenog spoja.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Integritet i vek konstrukcija",
title = "Effect of vibration on the variation of residual stresses and impact energy in butt-welded joints, Uticaj vibracija na promenu zaostalih napona i energije udara kod sučeono zavarenih spojeva",
pages = "220-215",
number = "3",
volume = "12",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2052"
}

Burzić, M., Prokić-Cvetković, R., Manjgo, M., Milović, L., Arsić, M.,& Popović, O.. (2012). Effect of vibration on the variation of residual stresses and impact energy in butt-welded joints. in Integritet i vek konstrukcija
Society for Structural Integrity and Life, Institute for Material Testing., 12(3), 215-220.
https://hdl.handle.net/21.15107/rcub_technorep_2052

Burzić M, Prokić-Cvetković R, Manjgo M, Milović L, Arsić M, Popović O. Effect of vibration on the variation of residual stresses and impact energy in butt-welded joints. in Integritet i vek konstrukcija. 2012;12(3):215-220.
https://hdl.handle.net/21.15107/rcub_technorep_2052 .

Burzić, Meri, Prokić-Cvetković, Radica, Manjgo, Mersida, Milović, Ljubica, Arsić, Miodrag, Popović, Olivera, "Effect of vibration on the variation of residual stresses and impact energy in butt-welded joints" in Integritet i vek konstrukcija, 12, no. 3 (2012):215-220,
https://hdl.handle.net/21.15107/rcub_technorep_2052 .