TY  - JOUR
AU  - Trajkovic, Isaak
AU  - Milošević, Miloš
AU  - Travica, Milan
AU  - Rakin, Marko
AU  - Mladenović, Goran
AU  - Kudrjavceva, Ljudmila
AU  - Međo, Bojan
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6874
AB  - This paper presents a part of development of a non-standard method for testing of cylindrical test specimens for measurement of fracture properties of pipeline materials. This method for testing of cylindrical structures working under pressure is based on determining of fracture mechanics parameters on SENT (Single Edge Notched Tension) specimens and new PRNT (Pipe Ring Notched Tension) specimens. In this work, both types of specimens required for this testing were manufactured from polyamide PA12 by using SLS (selective laser sintering) additive manufacturing method. Testing of the specimens is performed on the universal device for testing of mechanical properties of materials Shimadzu, AGS-X 100 kN. The tensile testing is accompanied by GOM Aramis 2M system, used for digital image correlation. By using these two systems, test results are obtained for ring-shaped and SENT specimens, including forces, displacements and fracture mechanics parameters CMOD (Crack Mouth Opening Displacement) and CTOD-δ5 (Crack Tip Opening Displacement obtained by δ5 technique), as well as crack growth. Repeatability of this process, along with valid result consistency, represent the basis for further development of the new method, including the determining of energy-based fracture mechanics parameters: J integral and stress intensity factor.
PB  - International Institute for the Science of Sintering
T2  - Science of Sintering
T1  - Novel Method for Measurement of Pipeline Materials Fracture Resistance-Examination on Selective Laser Sintered Cylindrical Specimens
EP  - 386
SP  - 373
VL  - 54
DO  - 10.2298/SOS2203373T
ER  - 

@article{
author = "Trajkovic, Isaak and Milošević, Miloš and Travica, Milan and Rakin, Marko and Mladenović, Goran and Kudrjavceva, Ljudmila and Međo, Bojan",
year = "2022",
abstract = "This paper presents a part of development of a non-standard method for testing of cylindrical test specimens for measurement of fracture properties of pipeline materials. This method for testing of cylindrical structures working under pressure is based on determining of fracture mechanics parameters on SENT (Single Edge Notched Tension) specimens and new PRNT (Pipe Ring Notched Tension) specimens. In this work, both types of specimens required for this testing were manufactured from polyamide PA12 by using SLS (selective laser sintering) additive manufacturing method. Testing of the specimens is performed on the universal device for testing of mechanical properties of materials Shimadzu, AGS-X 100 kN. The tensile testing is accompanied by GOM Aramis 2M system, used for digital image correlation. By using these two systems, test results are obtained for ring-shaped and SENT specimens, including forces, displacements and fracture mechanics parameters CMOD (Crack Mouth Opening Displacement) and CTOD-δ5 (Crack Tip Opening Displacement obtained by δ5 technique), as well as crack growth. Repeatability of this process, along with valid result consistency, represent the basis for further development of the new method, including the determining of energy-based fracture mechanics parameters: J integral and stress intensity factor.",
publisher = "International Institute for the Science of Sintering",
journal = "Science of Sintering",
title = "Novel Method for Measurement of Pipeline Materials Fracture Resistance-Examination on Selective Laser Sintered Cylindrical Specimens",
pages = "386-373",
volume = "54",
doi = "10.2298/SOS2203373T"
}

Trajkovic, I., Milošević, M., Travica, M., Rakin, M., Mladenović, G., Kudrjavceva, L.,& Međo, B.. (2022). Novel Method for Measurement of Pipeline Materials Fracture Resistance-Examination on Selective Laser Sintered Cylindrical Specimens. in Science of Sintering
International Institute for the Science of Sintering., 54, 373-386.
https://doi.org/10.2298/SOS2203373T

Trajkovic I, Milošević M, Travica M, Rakin M, Mladenović G, Kudrjavceva L, Međo B. Novel Method for Measurement of Pipeline Materials Fracture Resistance-Examination on Selective Laser Sintered Cylindrical Specimens. in Science of Sintering. 2022;54:373-386.
doi:10.2298/SOS2203373T .

Trajkovic, Isaak, Milošević, Miloš, Travica, Milan, Rakin, Marko, Mladenović, Goran, Kudrjavceva, Ljudmila, Međo, Bojan, "Novel Method for Measurement of Pipeline Materials Fracture Resistance-Examination on Selective Laser Sintered Cylindrical Specimens" in Science of Sintering, 54 (2022):373-386,
https://doi.org/10.2298/SOS2203373T . .

TY  - JOUR
AU  - Trajković, Isaak
AU  - Milošević, Miloš
AU  - Rakin, Marko
AU  - Sedmak, Aleksandar
AU  - Međo, Bojan
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6873
AB  - In order to define a procedure for integrity assessment of pipelines and determining the fracture mechanics parameters, a new type of specimen with a sharp notch, Pipe Ring Notched Tension (PRNT) specimen, is tested. The aim of the study is to determine the
influence of the specimen geometry (cylindrical shape, as well as number and length of stress concentrators) on parameters such
as force, Crack Mouth Opening Displacement CMOD, Crack Tip Opening Displacement CTOD and J integral. The specimens were fabricated by an additive production method - selective laser sintering (SLS). EOS Formiga P100 machine is used, and the material is polyamide PA12. In addition to Pipe Ring Notched Tension specimens, Single Edge Notched Tension (SENT)
specimens with identical cross section were also considered. All specimens were tested on a universal tensile testing machine. A
tool specially designed to apply contact pressure to the inner walls in the tension direction was used, simulating the internal pressure.
For determining the field of displacement and strain on the surface of the tested samples that occur during the loading, Aramis
GOM 2M optical measurement system was used. Aramis is applied for determination of geometry fracture mechanics parameters:
CMOD and CTOD (based on δ5 concept). In addition to the examination of fracture properties of additively manufactured PA12,
the main topic of this work is the development of the non-standard testing procedure, which will be subsequently applied to the
specimens cut from metallic or non-metallic pipes. As an important part of this procedure, the calculation of fracture parameters
will be conducted based on the results presented here.
PB  - Elsevier
T2  - Procedia Structural Integrity
T1  - Additively manufactured tensile ring-shaped specimens for pipeline material fracture examination - influence of geometry
EP  - 1319
SP  - 1314
VL  - 42
DO  - 10.1016/j.prostr.2022.12.167
ER  - 

@article{
author = "Trajković, Isaak and Milošević, Miloš and Rakin, Marko and Sedmak, Aleksandar and Međo, Bojan",
year = "2022",
abstract = "In order to define a procedure for integrity assessment of pipelines and determining the fracture mechanics parameters, a new type of specimen with a sharp notch, Pipe Ring Notched Tension (PRNT) specimen, is tested. The aim of the study is to determine the
influence of the specimen geometry (cylindrical shape, as well as number and length of stress concentrators) on parameters such
as force, Crack Mouth Opening Displacement CMOD, Crack Tip Opening Displacement CTOD and J integral. The specimens were fabricated by an additive production method - selective laser sintering (SLS). EOS Formiga P100 machine is used, and the material is polyamide PA12. In addition to Pipe Ring Notched Tension specimens, Single Edge Notched Tension (SENT)
specimens with identical cross section were also considered. All specimens were tested on a universal tensile testing machine. A
tool specially designed to apply contact pressure to the inner walls in the tension direction was used, simulating the internal pressure.
For determining the field of displacement and strain on the surface of the tested samples that occur during the loading, Aramis
GOM 2M optical measurement system was used. Aramis is applied for determination of geometry fracture mechanics parameters:
CMOD and CTOD (based on δ5 concept). In addition to the examination of fracture properties of additively manufactured PA12,
the main topic of this work is the development of the non-standard testing procedure, which will be subsequently applied to the
specimens cut from metallic or non-metallic pipes. As an important part of this procedure, the calculation of fracture parameters
will be conducted based on the results presented here.",
publisher = "Elsevier",
journal = "Procedia Structural Integrity",
title = "Additively manufactured tensile ring-shaped specimens for pipeline material fracture examination - influence of geometry",
pages = "1319-1314",
volume = "42",
doi = "10.1016/j.prostr.2022.12.167"
}

Trajković, I., Milošević, M., Rakin, M., Sedmak, A.,& Međo, B.. (2022). Additively manufactured tensile ring-shaped specimens for pipeline material fracture examination - influence of geometry. in Procedia Structural Integrity
Elsevier., 42, 1314-1319.
https://doi.org/10.1016/j.prostr.2022.12.167

Trajković I, Milošević M, Rakin M, Sedmak A, Međo B. Additively manufactured tensile ring-shaped specimens for pipeline material fracture examination - influence of geometry. in Procedia Structural Integrity. 2022;42:1314-1319.
doi:10.1016/j.prostr.2022.12.167 .

Trajković, Isaak, Milošević, Miloš, Rakin, Marko, Sedmak, Aleksandar, Međo, Bojan, "Additively manufactured tensile ring-shaped specimens for pipeline material fracture examination - influence of geometry" in Procedia Structural Integrity, 42 (2022):1314-1319,
https://doi.org/10.1016/j.prostr.2022.12.167 . .