TY  - JOUR
AU  - Eramah, Abdsalam M.
AU  - Rakin, Marko
AU  - Veljić, Darko
AU  - Tadić, Srđan
AU  - Radović, Nenad
AU  - Zrilić, Milorad
AU  - Perović, Milenko
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2676
AB  - The aim of this work is to analyse the process of friction stir welding (FSW) of 3 mm thick aluminium plates made of high strength aluminium alloy - 2024 T3, as well as to assess the mechanical properties of the produced joints. Friction Stir Welding is a modern procedure which enables joining of similar and dissimilar materials in the solid state, by the combined action of heat and mechanical work. This paper presents an analysis of the experimental results obtained by testing the butt welded joints. Tensile strength of the produced joints is assessed, as well as the distribution of hardness, micro-and macrostructure through the joints (in the base material, nugget, heat affected zone and thermo-mechanically affected zone). Different combinations of the tool rotation speed and the welding speed are used, and the dependence of the properties of the joints on these parameters of welding technology is determined.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Influence of friction stir welding parameters on properties of 2024 t3 aluminium alloy joints
EP  - S28
SP  - S21
VL  - 18
DO  - 10.2298/TSCI130307170E
ER  - 

@article{
author = "Eramah, Abdsalam M. and Rakin, Marko and Veljić, Darko and Tadić, Srđan and Radović, Nenad and Zrilić, Milorad and Perović, Milenko",
year = "2014",
abstract = "The aim of this work is to analyse the process of friction stir welding (FSW) of 3 mm thick aluminium plates made of high strength aluminium alloy - 2024 T3, as well as to assess the mechanical properties of the produced joints. Friction Stir Welding is a modern procedure which enables joining of similar and dissimilar materials in the solid state, by the combined action of heat and mechanical work. This paper presents an analysis of the experimental results obtained by testing the butt welded joints. Tensile strength of the produced joints is assessed, as well as the distribution of hardness, micro-and macrostructure through the joints (in the base material, nugget, heat affected zone and thermo-mechanically affected zone). Different combinations of the tool rotation speed and the welding speed are used, and the dependence of the properties of the joints on these parameters of welding technology is determined.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Influence of friction stir welding parameters on properties of 2024 t3 aluminium alloy joints",
pages = "S28-S21",
volume = "18",
doi = "10.2298/TSCI130307170E"
}

Eramah, A. M., Rakin, M., Veljić, D., Tadić, S., Radović, N., Zrilić, M.,& Perović, M.. (2014). Influence of friction stir welding parameters on properties of 2024 t3 aluminium alloy joints. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 18, S21-S28.
https://doi.org/10.2298/TSCI130307170E

Eramah AM, Rakin M, Veljić D, Tadić S, Radović N, Zrilić M, Perović M. Influence of friction stir welding parameters on properties of 2024 t3 aluminium alloy joints. in Thermal Science. 2014;18:S21-S28.
doi:10.2298/TSCI130307170E .

Eramah, Abdsalam M., Rakin, Marko, Veljić, Darko, Tadić, Srđan, Radović, Nenad, Zrilić, Milorad, Perović, Milenko, "Influence of friction stir welding parameters on properties of 2024 t3 aluminium alloy joints" in Thermal Science, 18 (2014):S21-S28,
https://doi.org/10.2298/TSCI130307170E . .

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  - Perović, Milenko
AU  - Veljić, Darko
AU  - Rakin, Marko
AU  - Radović, Nenad
AU  - Sedmak, Aleksandar
AU  - Bajić, Nikola
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2012
AB  - This paper defines a set of welding parameters for the Friction-Stir Welding (FSW) of two forged panels of the alloy EN AW 7049A in a T652 temper and discusses the plunge stage of FSW using numerical modeling. This multi-component aluminum alloy is characterized by high strength, reduced plasticity and poor weldability. Observations of the macrostructure and microstructure clearly showed typical zones of a FSW joint and the appropriate grain sizes. The finest grains were observed within the nugget, while the coarsest grains are found to be in the HAZ. The ultimate tensile strength is 80.3 % of the parent material. A coupled thermo-mechanical model was developed to study the temperature fields and the plunge force of the alloy EN AW 7049A under different rotating speeds, (300, 400 and 500) r/min, during the FSW process of the plunge stage. A three-dimensional FE model has been developed in ABAQUS/Explicit using the arbitrary Lagrangian-Eulerian formulation, the Johnson-Cook material law and Coulomb's Law of Friction. Numerical results indicate that the maximum temperature in the FSW process can be increased with an increase in the rotational speed, which can be used to reduce the plunge force.
PB  - Institute of Metals and Technology
T2  - Materiali in Tehnologije
T1  - Friction-stir welding of high-strength aluminium alloys and a numerical simulation of the plunge stage
EP  - 221
IS  - 3
SP  - 215
VL  - 46
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2012
ER  - 

@article{
author = "Perović, Milenko and Veljić, Darko and Rakin, Marko and Radović, Nenad and Sedmak, Aleksandar and Bajić, Nikola",
year = "2012",
abstract = "This paper defines a set of welding parameters for the Friction-Stir Welding (FSW) of two forged panels of the alloy EN AW 7049A in a T652 temper and discusses the plunge stage of FSW using numerical modeling. This multi-component aluminum alloy is characterized by high strength, reduced plasticity and poor weldability. Observations of the macrostructure and microstructure clearly showed typical zones of a FSW joint and the appropriate grain sizes. The finest grains were observed within the nugget, while the coarsest grains are found to be in the HAZ. The ultimate tensile strength is 80.3 % of the parent material. A coupled thermo-mechanical model was developed to study the temperature fields and the plunge force of the alloy EN AW 7049A under different rotating speeds, (300, 400 and 500) r/min, during the FSW process of the plunge stage. A three-dimensional FE model has been developed in ABAQUS/Explicit using the arbitrary Lagrangian-Eulerian formulation, the Johnson-Cook material law and Coulomb's Law of Friction. Numerical results indicate that the maximum temperature in the FSW process can be increased with an increase in the rotational speed, which can be used to reduce the plunge force.",
publisher = "Institute of Metals and Technology",
journal = "Materiali in Tehnologije",
title = "Friction-stir welding of high-strength aluminium alloys and a numerical simulation of the plunge stage",
pages = "221-215",
number = "3",
volume = "46",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2012"
}

Perović, M., Veljić, D., Rakin, M., Radović, N., Sedmak, A.,& Bajić, N.. (2012). Friction-stir welding of high-strength aluminium alloys and a numerical simulation of the plunge stage. in Materiali in Tehnologije
Institute of Metals and Technology., 46(3), 215-221.
https://hdl.handle.net/21.15107/rcub_technorep_2012

Perović M, Veljić D, Rakin M, Radović N, Sedmak A, Bajić N. Friction-stir welding of high-strength aluminium alloys and a numerical simulation of the plunge stage. in Materiali in Tehnologije. 2012;46(3):215-221.
https://hdl.handle.net/21.15107/rcub_technorep_2012 .

Perović, Milenko, Veljić, Darko, Rakin, Marko, Radović, Nenad, Sedmak, Aleksandar, Bajić, Nikola, "Friction-stir welding of high-strength aluminium alloys and a numerical simulation of the plunge stage" in Materiali in Tehnologije, 46, no. 3 (2012):215-221,
https://hdl.handle.net/21.15107/rcub_technorep_2012 .

TY  - JOUR
AU  - Veljić, Darko
AU  - Perović, Milenko
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Trifunović, Miroslav V.
AU  - Bajić, Nikola
AU  - Bajić, Darko
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2029
AB  - A coupled thermo-mechanical model was developed to study the temperature fields, the plunge force and the plastic deformations of Al alloy 2024-T351 under different rotating speed: 350, 400, and 450 rpm, during the friction stir welding process. 3-D FE model has been developed in ABAQUS/Explicit using the arbitrary Lagrangian-Eulerian formulation, the Johnson-Cook material law, and the Coulomb’s Law of friction. Numerical results indicate that the maximum temperature in the friction stir welding process is lower than the melting point of the welding material. The temperature filed is approximately symmetrical along the welding line. A lower plastic strain region can be found near the welding tool in the trailing side on the bottom surface. With increasing rotation speed, the low plastic strain region is reduced. When the rotational speed is increased, the plunge force can be reduced. Regions with high equivalent plastic strains are observed which correspond to the nugget and the flow arm.
PB  - Vinca Institute of Nuclear Sciences
T2  - Thermal Science
T1  - A coupled thermo-mechanical model of friction stir welding
EP  - 534
IS  - 2
SP  - 527
VL  - 16
UR  - https://hdl.handle.net/21.15107/rcub_technorep_2029
ER  - 

@article{
author = "Veljić, Darko and Perović, Milenko and Sedmak, Aleksandar and Rakin, Marko and Trifunović, Miroslav V. and Bajić, Nikola and Bajić, Darko",
year = "2012",
abstract = "A coupled thermo-mechanical model was developed to study the temperature fields, the plunge force and the plastic deformations of Al alloy 2024-T351 under different rotating speed: 350, 400, and 450 rpm, during the friction stir welding process. 3-D FE model has been developed in ABAQUS/Explicit using the arbitrary Lagrangian-Eulerian formulation, the Johnson-Cook material law, and the Coulomb’s Law of friction. Numerical results indicate that the maximum temperature in the friction stir welding process is lower than the melting point of the welding material. The temperature filed is approximately symmetrical along the welding line. A lower plastic strain region can be found near the welding tool in the trailing side on the bottom surface. With increasing rotation speed, the low plastic strain region is reduced. When the rotational speed is increased, the plunge force can be reduced. Regions with high equivalent plastic strains are observed which correspond to the nugget and the flow arm.",
publisher = "Vinca Institute of Nuclear Sciences",
journal = "Thermal Science",
title = "A coupled thermo-mechanical model of friction stir welding",
pages = "534-527",
number = "2",
volume = "16",
url = "https://hdl.handle.net/21.15107/rcub_technorep_2029"
}

Veljić, D., Perović, M., Sedmak, A., Rakin, M., Trifunović, M. V., Bajić, N.,& Bajić, D.. (2012). A coupled thermo-mechanical model of friction stir welding. in Thermal Science
Vinca Institute of Nuclear Sciences., 16(2), 527-534.
https://hdl.handle.net/21.15107/rcub_technorep_2029

Veljić D, Perović M, Sedmak A, Rakin M, Trifunović MV, Bajić N, Bajić D. A coupled thermo-mechanical model of friction stir welding. in Thermal Science. 2012;16(2):527-534.
https://hdl.handle.net/21.15107/rcub_technorep_2029 .

Veljić, Darko, Perović, Milenko, Sedmak, Aleksandar, Rakin, Marko, Trifunović, Miroslav V., Bajić, Nikola, Bajić, Darko, "A coupled thermo-mechanical model of friction stir welding" in Thermal Science, 16, no. 2 (2012):527-534,
https://hdl.handle.net/21.15107/rcub_technorep_2029 .

TY  - JOUR
AU  - Veljić, Darko
AU  - Perović, Milenko
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1787
AB  - This paper investigates the plunge stage using numerical modeling. Change of temperature and plunge force have been analyzed during the plunge stage of the FSW procedure for high hardness aluminum alloys EN AW 2024 T 351 and EN AW 7049A T 652, at different speed of tool rotation. Numerical results indicate that the maximum temperature in the FSW process can be increased with the increase of the rotational speed and that temperature is lower than the melting point of the welding material. Higher temperature was registered at the aluminum alloy EN AW 2024 T 351 at the same speed of tool rotation, and higher plunge force - resistance of material was registered at the alloy EN AW 7049A T 652. When the rotational speed is increased, the plunge force can be reduced. A three-dimensional finite element model (FEM) of the plunge stage was developed using the commercial code ABAQUS to study the thermo-mechanical processes involved during the plunge stage. A coupled thermo-mechanical 3D FE model using the arbitrary Lagrangian-Eulerian formulation, the Johnson-Cook material law and the Coulomb's Law of friction. In this analysis, temperature, displacement and mechanical responses are determined simultaneously. The heat generation in FSW can be divided into three parts: frictional heat generated by the tool shoulder, frictional heat generated by the tool pin, and heat generated by material plastic deformation near the pin region.
AB  - Tema ovog rada je proučavanje faze probijanja korišćenjem numeričkog modela. Analizirana je promena temperature i sile probijanja u toku faze probijanja postupka zavarivanja trenjem mešanjem za legure aluminijuma visoke čvrstoće EN AW 2024 T 351 i EN AW 7049A T 652, pri različitim brzinama rotacije alata. Numerički rezultati pokazuju da maksimalne temperature u postupku zavarivanja trenjem mešanjem mogu biti povećane sa povećanjem brzine rotacije alata i da su temperature manje od temperature topljenja materijala koji se zavaruje. Pri istim brzinama rotacije alata, registrovana je veća temperatura kod legure aluminijuma EN AW 2024 T 351 i veća sila probijanja - otpor materijala kod legure EN AW 7049A T 652. Sa povećanjem brzine rotacije alata, sila probijanja može biti smanjena. Trodimenzionalni model konačnih elemenata faze probijanja je razvijen korišćenjem ABAQUS programskog paketa za proučavanje termomehaničkih procesa faze probijanja. Spregnuti termo-mehanički model konačnih elemenata koristi proizvoljnu Lagranž-Ojlerovu formulaciju, Džonson-Kukov zakon i Kulonov zakon trenja. U ovoj analizi se temperatura, pomjeranje i mehaničke reakcije posmatraju istovremeno. Generisanje toplote u postupku zavarivanja trenjem mešanjem se može podeliti na tri dela:generisanje toplote trenjem od čela alata, generisanje toplote trenjem od trna alata i generisanje toplote od plastičnih deformacija u blizini trna alata.
PB  - Univerzitet u Novom Sadu - Fakultet tehničkih nauka - Institut za proizvodno mašinstvo, Novi Sad
T2  - Journal for Technology of Plasticity
T1  - Numerical simulation of the plunge stage in friction stir welding alloys EN AW 2024 T 351 and EN AW 7049A T 652
T1  - Numerička simulacija faze probijanja postupka zavarivanja trenjem mešanjem legura EN AW 2024 T 351 i EN AW 7049A T 652
EP  - 110
IS  - 2
SP  - 97
VL  - 36
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1787
ER  - 

@article{
author = "Veljić, Darko and Perović, Milenko and Sedmak, Aleksandar and Rakin, Marko",
year = "2011",
abstract = "This paper investigates the plunge stage using numerical modeling. Change of temperature and plunge force have been analyzed during the plunge stage of the FSW procedure for high hardness aluminum alloys EN AW 2024 T 351 and EN AW 7049A T 652, at different speed of tool rotation. Numerical results indicate that the maximum temperature in the FSW process can be increased with the increase of the rotational speed and that temperature is lower than the melting point of the welding material. Higher temperature was registered at the aluminum alloy EN AW 2024 T 351 at the same speed of tool rotation, and higher plunge force - resistance of material was registered at the alloy EN AW 7049A T 652. When the rotational speed is increased, the plunge force can be reduced. A three-dimensional finite element model (FEM) of the plunge stage was developed using the commercial code ABAQUS to study the thermo-mechanical processes involved during the plunge stage. A coupled thermo-mechanical 3D FE model using the arbitrary Lagrangian-Eulerian formulation, the Johnson-Cook material law and the Coulomb's Law of friction. In this analysis, temperature, displacement and mechanical responses are determined simultaneously. The heat generation in FSW can be divided into three parts: frictional heat generated by the tool shoulder, frictional heat generated by the tool pin, and heat generated by material plastic deformation near the pin region., Tema ovog rada je proučavanje faze probijanja korišćenjem numeričkog modela. Analizirana je promena temperature i sile probijanja u toku faze probijanja postupka zavarivanja trenjem mešanjem za legure aluminijuma visoke čvrstoće EN AW 2024 T 351 i EN AW 7049A T 652, pri različitim brzinama rotacije alata. Numerički rezultati pokazuju da maksimalne temperature u postupku zavarivanja trenjem mešanjem mogu biti povećane sa povećanjem brzine rotacije alata i da su temperature manje od temperature topljenja materijala koji se zavaruje. Pri istim brzinama rotacije alata, registrovana je veća temperatura kod legure aluminijuma EN AW 2024 T 351 i veća sila probijanja - otpor materijala kod legure EN AW 7049A T 652. Sa povećanjem brzine rotacije alata, sila probijanja može biti smanjena. Trodimenzionalni model konačnih elemenata faze probijanja je razvijen korišćenjem ABAQUS programskog paketa za proučavanje termomehaničkih procesa faze probijanja. Spregnuti termo-mehanički model konačnih elemenata koristi proizvoljnu Lagranž-Ojlerovu formulaciju, Džonson-Kukov zakon i Kulonov zakon trenja. U ovoj analizi se temperatura, pomjeranje i mehaničke reakcije posmatraju istovremeno. Generisanje toplote u postupku zavarivanja trenjem mešanjem se može podeliti na tri dela:generisanje toplote trenjem od čela alata, generisanje toplote trenjem od trna alata i generisanje toplote od plastičnih deformacija u blizini trna alata.",
publisher = "Univerzitet u Novom Sadu - Fakultet tehničkih nauka - Institut za proizvodno mašinstvo, Novi Sad",
journal = "Journal for Technology of Plasticity",
title = "Numerical simulation of the plunge stage in friction stir welding alloys EN AW 2024 T 351 and EN AW 7049A T 652, Numerička simulacija faze probijanja postupka zavarivanja trenjem mešanjem legura EN AW 2024 T 351 i EN AW 7049A T 652",
pages = "110-97",
number = "2",
volume = "36",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1787"
}

Veljić, D., Perović, M., Sedmak, A.,& Rakin, M.. (2011). Numerical simulation of the plunge stage in friction stir welding alloys EN AW 2024 T 351 and EN AW 7049A T 652. in Journal for Technology of Plasticity
Univerzitet u Novom Sadu - Fakultet tehničkih nauka - Institut za proizvodno mašinstvo, Novi Sad., 36(2), 97-110.
https://hdl.handle.net/21.15107/rcub_technorep_1787

Veljić D, Perović M, Sedmak A, Rakin M. Numerical simulation of the plunge stage in friction stir welding alloys EN AW 2024 T 351 and EN AW 7049A T 652. in Journal for Technology of Plasticity. 2011;36(2):97-110.
https://hdl.handle.net/21.15107/rcub_technorep_1787 .

Veljić, Darko, Perović, Milenko, Sedmak, Aleksandar, Rakin, Marko, "Numerical simulation of the plunge stage in friction stir welding alloys EN AW 2024 T 351 and EN AW 7049A T 652" in Journal for Technology of Plasticity, 36, no. 2 (2011):97-110,
https://hdl.handle.net/21.15107/rcub_technorep_1787 .

TY  - JOUR
AU  - Veljić, Darko
AU  - Perović, Milenko
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Bajić, Nikola
AU  - Međo, Bojan
AU  - Dascau, Horia
PY  - 2011
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1842
AB  - This paper investigates the plunge stage using numerical modeling. A three-dimensional finite element model (FEM) of the plunge stage is developed using the commercial code ABAQUS to study the thermo-mechanical processes involved during the plunge stage. A coupled thermo-mechanical 3D FE model uses the arbitrary Lagrangian-Eulerian formulation, the Johnson-Cook material law and Coulomb's Law of friction. The model is developed to study the temperature fields of alloy Al2024-T351 under different process parameters (rotating speed) during the friction stir welding (FSW) process. Numerical results indicate that the maximal temperature of the FSW process can be increased with the increase of rotational speed and that temperature is lower than the melting point of the welding material. In this analysis, temperature, displacement, and mechanical responses are determined simultaneously. The heat generation in FSW can be divided into three parts: frictional heat generated by the tool shoulder, frictional heat generated by the tool pin, and heat generated by material deformation near the pin region.
AB  - U ovom radu je istražena faza uranjanja alata primenom numeričkog modeliranja. Trodimenzionalni model konačnih elemenata (FEM) faze uranjanja je razvijen primenom softvera ABAQUS radi proučavanja termomehaničkih procesa koji se odvijaju tokom faze uranjanja. Spregnuti termomehanički 3D FE model se bazira na proizvoljnim formulacijama Lagranža-Ojlera, zakonu materijala Džonson-Kuk i Kulonovom zakonu trenja. Model je razvijen radi proučavanja temperaturskih polja legure Al2024-T351 pod različitim parametrima postupka (brzina rotacije) kod postupka zavarivanja trenjem mešanjem (FSW). Numerički rezultati pokazuju da se maksimalna temperatura postupka FSW može povećati sa povećanjem brzine rotacije, kao i da je temperatura niža od tačke topljenja zavarenog materijala. U ovoj analizi, temperatura, pomeranje i mehanički odzivi se određuju simultano. Izdvajanje toplote kod FSW se može podeliti na tri dela: toplota trenja koja se razvija kretanjem čela alata, toplota trenja dobijena kretanjem trna alata, kao i toplota usled plastične deformacije materijala u blizini oblasti trna alata.
PB  - Society for Structural Integrity and Life, Institute for Material Testing
T2  - Integritet i vek konstrukcija
T1  - Numerical simulation of the plunge stage in friction stir welding
T1  - Numerička simulacija faze uranjanja kod zavarivanja trenjem mešanjem
EP  - 134
IS  - 2
SP  - 131
VL  - 11
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1842
ER  - 

@article{
author = "Veljić, Darko and Perović, Milenko and Sedmak, Aleksandar and Rakin, Marko and Bajić, Nikola and Međo, Bojan and Dascau, Horia",
year = "2011",
abstract = "This paper investigates the plunge stage using numerical modeling. A three-dimensional finite element model (FEM) of the plunge stage is developed using the commercial code ABAQUS to study the thermo-mechanical processes involved during the plunge stage. A coupled thermo-mechanical 3D FE model uses the arbitrary Lagrangian-Eulerian formulation, the Johnson-Cook material law and Coulomb's Law of friction. The model is developed to study the temperature fields of alloy Al2024-T351 under different process parameters (rotating speed) during the friction stir welding (FSW) process. Numerical results indicate that the maximal temperature of the FSW process can be increased with the increase of rotational speed and that temperature is lower than the melting point of the welding material. In this analysis, temperature, displacement, and mechanical responses are determined simultaneously. The heat generation in FSW can be divided into three parts: frictional heat generated by the tool shoulder, frictional heat generated by the tool pin, and heat generated by material deformation near the pin region., U ovom radu je istražena faza uranjanja alata primenom numeričkog modeliranja. Trodimenzionalni model konačnih elemenata (FEM) faze uranjanja je razvijen primenom softvera ABAQUS radi proučavanja termomehaničkih procesa koji se odvijaju tokom faze uranjanja. Spregnuti termomehanički 3D FE model se bazira na proizvoljnim formulacijama Lagranža-Ojlera, zakonu materijala Džonson-Kuk i Kulonovom zakonu trenja. Model je razvijen radi proučavanja temperaturskih polja legure Al2024-T351 pod različitim parametrima postupka (brzina rotacije) kod postupka zavarivanja trenjem mešanjem (FSW). Numerički rezultati pokazuju da se maksimalna temperatura postupka FSW može povećati sa povećanjem brzine rotacije, kao i da je temperatura niža od tačke topljenja zavarenog materijala. U ovoj analizi, temperatura, pomeranje i mehanički odzivi se određuju simultano. Izdvajanje toplote kod FSW se može podeliti na tri dela: toplota trenja koja se razvija kretanjem čela alata, toplota trenja dobijena kretanjem trna alata, kao i toplota usled plastične deformacije materijala u blizini oblasti trna alata.",
publisher = "Society for Structural Integrity and Life, Institute for Material Testing",
journal = "Integritet i vek konstrukcija",
title = "Numerical simulation of the plunge stage in friction stir welding, Numerička simulacija faze uranjanja kod zavarivanja trenjem mešanjem",
pages = "134-131",
number = "2",
volume = "11",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1842"
}

Veljić, D., Perović, M., Sedmak, A., Rakin, M., Bajić, N., Međo, B.,& Dascau, H.. (2011). Numerical simulation of the plunge stage in friction stir welding. in Integritet i vek konstrukcija
Society for Structural Integrity and Life, Institute for Material Testing., 11(2), 131-134.
https://hdl.handle.net/21.15107/rcub_technorep_1842

Veljić D, Perović M, Sedmak A, Rakin M, Bajić N, Međo B, Dascau H. Numerical simulation of the plunge stage in friction stir welding. in Integritet i vek konstrukcija. 2011;11(2):131-134.
https://hdl.handle.net/21.15107/rcub_technorep_1842 .

Veljić, Darko, Perović, Milenko, Sedmak, Aleksandar, Rakin, Marko, Bajić, Nikola, Međo, Bojan, Dascau, Horia, "Numerical simulation of the plunge stage in friction stir welding" in Integritet i vek konstrukcija, 11, no. 2 (2011):131-134,
https://hdl.handle.net/21.15107/rcub_technorep_1842 .

TY  - JOUR
AU  - Veljić, Darko
AU  - Radović, Nenad
AU  - Sedmak, Aleksandar
AU  - Perović, Milenko
PY  - 2010
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1647
AB  - The objective of this paper is a development of welding technology of aluminium alloys by Friction Stir Welding (FSW). FSW is a very modern welding process with a great future use, primarily due to a variety of possible combinations of dissimilar materials to be welded. In this paper experimental results of butt welds for the friction stir welding of aluminium alloys are analyzed. A comparison hardness distribution in the welds was done considering welding parameters, that is the quantity of heat in the welding zone, panels thickness and aluminum alloy type.
AB  - Cilj rada je osvajanje tehnologije zavarivanja aluminijumskih legura postupkom zavarivanja trenjem alatom (FSW). Zavarivanje trenjem alatom predstavlja jedan od najsavremenijih postupaka, sa velikom perspektivom dalje primene, pošto pruža najraznovrsnije mogućnosti za zavarivanje raznorodnih materijala. U radu su analizirani eksperimentalni rezultati su čeono zavarenih spojeva aluminijumskih ploča zavarenih postupkom zavarivanja trenjem alatom. Izvršeno je poređenje raspodele tvrdoće u zavarenom spoju u zavisnosti od parametara zavarivanja odnosno količine unete toplote u zoni zavarivanja, debljine ploča i tipa aluminijumske legure.
PB  - DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd
T2  - Zavarivanje i zavarene konstrukcije
T1  - Welding technology of aluminium alloys using friction stir welding
T1  - Tehnologija zavarivanja aluminijumskih legura postupkom zavarivanja trenjem alatom
EP  - 20
IS  - 1
SP  - 13
VL  - 55
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1647
ER  - 

@article{
author = "Veljić, Darko and Radović, Nenad and Sedmak, Aleksandar and Perović, Milenko",
year = "2010",
abstract = "The objective of this paper is a development of welding technology of aluminium alloys by Friction Stir Welding (FSW). FSW is a very modern welding process with a great future use, primarily due to a variety of possible combinations of dissimilar materials to be welded. In this paper experimental results of butt welds for the friction stir welding of aluminium alloys are analyzed. A comparison hardness distribution in the welds was done considering welding parameters, that is the quantity of heat in the welding zone, panels thickness and aluminum alloy type., Cilj rada je osvajanje tehnologije zavarivanja aluminijumskih legura postupkom zavarivanja trenjem alatom (FSW). Zavarivanje trenjem alatom predstavlja jedan od najsavremenijih postupaka, sa velikom perspektivom dalje primene, pošto pruža najraznovrsnije mogućnosti za zavarivanje raznorodnih materijala. U radu su analizirani eksperimentalni rezultati su čeono zavarenih spojeva aluminijumskih ploča zavarenih postupkom zavarivanja trenjem alatom. Izvršeno je poređenje raspodele tvrdoće u zavarenom spoju u zavisnosti od parametara zavarivanja odnosno količine unete toplote u zoni zavarivanja, debljine ploča i tipa aluminijumske legure.",
publisher = "DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd",
journal = "Zavarivanje i zavarene konstrukcije",
title = "Welding technology of aluminium alloys using friction stir welding, Tehnologija zavarivanja aluminijumskih legura postupkom zavarivanja trenjem alatom",
pages = "20-13",
number = "1",
volume = "55",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1647"
}

Veljić, D., Radović, N., Sedmak, A.,& Perović, M.. (2010). Welding technology of aluminium alloys using friction stir welding. in Zavarivanje i zavarene konstrukcije
DUZS - Društvo za unapređivanje zavarivanja u Srbiji, Beograd., 55(1), 13-20.
https://hdl.handle.net/21.15107/rcub_technorep_1647

Veljić D, Radović N, Sedmak A, Perović M. Welding technology of aluminium alloys using friction stir welding. in Zavarivanje i zavarene konstrukcije. 2010;55(1):13-20.
https://hdl.handle.net/21.15107/rcub_technorep_1647 .

Veljić, Darko, Radović, Nenad, Sedmak, Aleksandar, Perović, Milenko, "Welding technology of aluminium alloys using friction stir welding" in Zavarivanje i zavarene konstrukcije, 55, no. 1 (2010):13-20,
https://hdl.handle.net/21.15107/rcub_technorep_1647 .