TY  - CONF
AU  - Trajković, Isaak
AU  - Milošević, Miloš
AU  - Travica, Milan
AU  - Rakin, Marko
AU  - Jevtić, Ivana
AU  - Sedmak, Aleksandar
AU  - Međo, Bojan
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6010
AB  - This work presents the fabrication and tensile testing of polyamide specimens fabricated by
selective laser sintering (SLS). Two geometries are considered: SENT (Single Edge Notched
Tension) and PRNT (Pipe Ring Notched Tension) specimens. Experimental testing of these
specimens is a step in development of a new method for testing of properties of the pipeline
materials. The samples were produced by SLS (Selective Laser Sintering) additive production
technique. The samples were made from polyamide PA12 on EOS Formiga P100 machine
(fabrication parameters: laser power 30 W, print layer height 0.1 mm, scanning speed 1.6-5
m/s, operating temperature 170⁰C). Testing was performed in the displacement control on a
universal tensile testing machine Shimadzu AGS - X. On this machine, the values of force as
well as the values of stress and strain were obtained directly from the Trapezium X software.
Special attention in this work is devoted to two important aspects: fixing of the ring specimen
for testing and influence of friction between the specimen and the tool. The results obtained
on the examined specimens indicate that this study is a valuable contribution for further
development and verification of the new fracture resistance testing procedure for different
pipeline materials.
PB  - Serbian Academy of Sciences and Arts
C3  - Serbian Ceramic Society Conference ADVANCED CERAMICS AND APPLICATION X New Frontiers in Multifunctional Material Science and Processing
T1  - Laser sintered polyamide specimens - fabrication and tensile testing conditions on different geometries
SP  - 80
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6010
ER  - 

@conference{
author = "Trajković, Isaak and Milošević, Miloš and Travica, Milan and Rakin, Marko and Jevtić, Ivana and Sedmak, Aleksandar and Međo, Bojan",
year = "2022",
abstract = "This work presents the fabrication and tensile testing of polyamide specimens fabricated by
selective laser sintering (SLS). Two geometries are considered: SENT (Single Edge Notched
Tension) and PRNT (Pipe Ring Notched Tension) specimens. Experimental testing of these
specimens is a step in development of a new method for testing of properties of the pipeline
materials. The samples were produced by SLS (Selective Laser Sintering) additive production
technique. The samples were made from polyamide PA12 on EOS Formiga P100 machine
(fabrication parameters: laser power 30 W, print layer height 0.1 mm, scanning speed 1.6-5
m/s, operating temperature 170⁰C). Testing was performed in the displacement control on a
universal tensile testing machine Shimadzu AGS - X. On this machine, the values of force as
well as the values of stress and strain were obtained directly from the Trapezium X software.
Special attention in this work is devoted to two important aspects: fixing of the ring specimen
for testing and influence of friction between the specimen and the tool. The results obtained
on the examined specimens indicate that this study is a valuable contribution for further
development and verification of the new fracture resistance testing procedure for different
pipeline materials.",
publisher = "Serbian Academy of Sciences and Arts",
journal = "Serbian Ceramic Society Conference ADVANCED CERAMICS AND APPLICATION X New Frontiers in Multifunctional Material Science and Processing",
title = "Laser sintered polyamide specimens - fabrication and tensile testing conditions on different geometries",
pages = "80",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6010"
}

Trajković, I., Milošević, M., Travica, M., Rakin, M., Jevtić, I., Sedmak, A.,& Međo, B.. (2022). Laser sintered polyamide specimens - fabrication and tensile testing conditions on different geometries. in Serbian Ceramic Society Conference ADVANCED CERAMICS AND APPLICATION X New Frontiers in Multifunctional Material Science and Processing
Serbian Academy of Sciences and Arts., 80.
https://hdl.handle.net/21.15107/rcub_technorep_6010

Trajković I, Milošević M, Travica M, Rakin M, Jevtić I, Sedmak A, Međo B. Laser sintered polyamide specimens - fabrication and tensile testing conditions on different geometries. in Serbian Ceramic Society Conference ADVANCED CERAMICS AND APPLICATION X New Frontiers in Multifunctional Material Science and Processing. 2022;:80.
https://hdl.handle.net/21.15107/rcub_technorep_6010 .

Trajković, Isaak, Milošević, Miloš, Travica, Milan, Rakin, Marko, Jevtić, Ivana, Sedmak, Aleksandar, Međo, Bojan, "Laser sintered polyamide specimens - fabrication and tensile testing conditions on different geometries" in Serbian Ceramic Society Conference ADVANCED CERAMICS AND APPLICATION X New Frontiers in Multifunctional Material Science and Processing (2022):80,
https://hdl.handle.net/21.15107/rcub_technorep_6010 .

TY  - JOUR
AU  - Rakin, Marko
AU  - Gubeljak, Nenad
AU  - Dobrojević, M.
AU  - Sedmak, Aleksandar
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5569
AB  - In this paper, the effect of strength mismatch and width of the welded joints oil the stress-strain distribution in the crack tip region has been discussed. The single-edge notched bend (SENB) specimens (precrack length a(0)/W= 0.32) were experimentally and numerically analysed. The model of local approach to fracture, proposed by Gurson, Tvergaard and Needleman, was used. High-strength low-alloyed (HSLA) steel was used as a base metal in quenched and tempered condition. The flux-cored arc-welding process in shielding gas was used. Two different fillers were selected to make over- and undermatched weld metal. The experimental analysis of fracture behaviour of the over- and undermatched welded joints was followed by numerical computations of void volume fraction in front of the crack tip. The critical void volume fraction, f(c), used in prediction of the crack growth initiation on the SENB specimen had been previously determined on a round smooth specimen. Three widths of weld metal were considered: 6,12 and 18 mm. A comparison of the crack tip opening displacement (CTOD) values corresponding to crack initiation in the SENB specimens is given, as determined both experimentally and using the GTN model.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Fracture Mechanics
T1  - Modelling of ductile fracture initiation in strength mismatched welded joint
EP  - 3510
IS  - 11
SP  - 3499
VL  - 75
DO  - 10.1016/j.engfracmech.2007.04.026
ER  - 

@article{
author = "Rakin, Marko and Gubeljak, Nenad and Dobrojević, M. and Sedmak, Aleksandar",
year = "2008",
abstract = "In this paper, the effect of strength mismatch and width of the welded joints oil the stress-strain distribution in the crack tip region has been discussed. The single-edge notched bend (SENB) specimens (precrack length a(0)/W= 0.32) were experimentally and numerically analysed. The model of local approach to fracture, proposed by Gurson, Tvergaard and Needleman, was used. High-strength low-alloyed (HSLA) steel was used as a base metal in quenched and tempered condition. The flux-cored arc-welding process in shielding gas was used. Two different fillers were selected to make over- and undermatched weld metal. The experimental analysis of fracture behaviour of the over- and undermatched welded joints was followed by numerical computations of void volume fraction in front of the crack tip. The critical void volume fraction, f(c), used in prediction of the crack growth initiation on the SENB specimen had been previously determined on a round smooth specimen. Three widths of weld metal were considered: 6,12 and 18 mm. A comparison of the crack tip opening displacement (CTOD) values corresponding to crack initiation in the SENB specimens is given, as determined both experimentally and using the GTN model.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Fracture Mechanics",
title = "Modelling of ductile fracture initiation in strength mismatched welded joint",
pages = "3510-3499",
number = "11",
volume = "75",
doi = "10.1016/j.engfracmech.2007.04.026"
}

Rakin, M., Gubeljak, N., Dobrojević, M.,& Sedmak, A.. (2008). Modelling of ductile fracture initiation in strength mismatched welded joint. in Engineering Fracture Mechanics
Pergamon-Elsevier Science Ltd, Oxford., 75(11), 3499-3510.
https://doi.org/10.1016/j.engfracmech.2007.04.026

Rakin M, Gubeljak N, Dobrojević M, Sedmak A. Modelling of ductile fracture initiation in strength mismatched welded joint. in Engineering Fracture Mechanics. 2008;75(11):3499-3510.
doi:10.1016/j.engfracmech.2007.04.026 .

Rakin, Marko, Gubeljak, Nenad, Dobrojević, M., Sedmak, Aleksandar, "Modelling of ductile fracture initiation in strength mismatched welded joint" in Engineering Fracture Mechanics, 75, no. 11 (2008):3499-3510,
https://doi.org/10.1016/j.engfracmech.2007.04.026 . .