TY  - CONF
AU  - Milovanović, Aleksa
AU  - Galațanu, Sergiu-Valentin
AU  - Sedmak, Aleksandar
AU  - Marsavina, Liviu
AU  - Trajković, Isaak
AU  - Popa, Cosmin-Florin
AU  - Milošević, Miloš
PY  - 2024
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7780
AB  - Polylactic Acid (PLA) is a widely used material in Fused Deposition Modeling (FDM) technology. Additive Manufacturing (AM) parameters are known to have an influence on the mechanical properties of final components. In FDM, the layer thickness is an influencing parameter providing overall better mechanical properties with lower layer thickness values. In that case, the air gaps created between layers and raster lines have a lower share in total volume. However, layer over-compression might be an issue when choosing the lowest layer thickness options. This research paper investigates the impact properties of PLA material with variations in layer thickness namely, 0.1, 0.2, and 0.3 mm are considered here. Charpy tests were used for the impact property assessment, and all specimens were prepared with 100% infill percentage and honeycomb infill structure. Worth mentioning is that specimens have AMed notches. The impact tests were carried out on 7 specimens per batch (a total of 21 specimens). Therefore, obtained impact results from an instrumented pendulum were observed between groups to have an insight into the beneficial influence of lower layer thickness on impact properties and lower result scatter that finer layer resolution should produce.
PB  - Elsevier
C3  - Procedia Structural Integrity
T1  - Layer thickness influence on impact properties of FDM printed PLA material
EP  - 197
SP  - 190
VL  - 56
DO  - 10.1016/j.prostr.2024.02.055
ER  - 

@conference{
author = "Milovanović, Aleksa and Galațanu, Sergiu-Valentin and Sedmak, Aleksandar and Marsavina, Liviu and Trajković, Isaak and Popa, Cosmin-Florin and Milošević, Miloš",
year = "2024",
abstract = "Polylactic Acid (PLA) is a widely used material in Fused Deposition Modeling (FDM) technology. Additive Manufacturing (AM) parameters are known to have an influence on the mechanical properties of final components. In FDM, the layer thickness is an influencing parameter providing overall better mechanical properties with lower layer thickness values. In that case, the air gaps created between layers and raster lines have a lower share in total volume. However, layer over-compression might be an issue when choosing the lowest layer thickness options. This research paper investigates the impact properties of PLA material with variations in layer thickness namely, 0.1, 0.2, and 0.3 mm are considered here. Charpy tests were used for the impact property assessment, and all specimens were prepared with 100% infill percentage and honeycomb infill structure. Worth mentioning is that specimens have AMed notches. The impact tests were carried out on 7 specimens per batch (a total of 21 specimens). Therefore, obtained impact results from an instrumented pendulum were observed between groups to have an insight into the beneficial influence of lower layer thickness on impact properties and lower result scatter that finer layer resolution should produce.",
publisher = "Elsevier",
journal = "Procedia Structural Integrity",
title = "Layer thickness influence on impact properties of FDM printed PLA material",
pages = "197-190",
volume = "56",
doi = "10.1016/j.prostr.2024.02.055"
}

Milovanović, A., Galațanu, S., Sedmak, A., Marsavina, L., Trajković, I., Popa, C.,& Milošević, M.. (2024). Layer thickness influence on impact properties of FDM printed PLA material. in Procedia Structural Integrity
Elsevier., 56, 190-197.
https://doi.org/10.1016/j.prostr.2024.02.055

Milovanović A, Galațanu S, Sedmak A, Marsavina L, Trajković I, Popa C, Milošević M. Layer thickness influence on impact properties of FDM printed PLA material. in Procedia Structural Integrity. 2024;56:190-197.
doi:10.1016/j.prostr.2024.02.055 .

Milovanović, Aleksa, Galațanu, Sergiu-Valentin, Sedmak, Aleksandar, Marsavina, Liviu, Trajković, Isaak, Popa, Cosmin-Florin, Milošević, Miloš, "Layer thickness influence on impact properties of FDM printed PLA material" in Procedia Structural Integrity, 56 (2024):190-197,
https://doi.org/10.1016/j.prostr.2024.02.055 . .

TY  - CONF
AU  - Trajković, Isaak
AU  - Milošević, Miloš
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Marsavina, Liviu
AU  - Medjo, Bojan
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7280
AB  - How and in which field products made by additive technologies can be applied depends not only on the type
of material and manufacturing technique but also on the economic aspect. The most affordable materials and
techniques are often used for rapid product development. These products are very often a replacement or
temporary part in a machine assembly. The integrity of such an assembly due to the mechanical characteristics
of the materials used in additive manufacturing most often depends on the element made by additive
manufacturing. In order to understand the question of the integrity of the element itself and on that basis to
choose the technique and material for the production of elements, it was necessary to compare the parameters
of fracture mechanics for two types of materials. In this study, the results of fracture mechanical parameters
will be presented. Parameters of fracture mechanics was obtained by using the Aramis 2M system by the
method of digital image correlation (DIC) and a universal machine for testing the mechanical properties of
materials (Shimadzu AGS-X 100kN) on SENT (Single Edge Notched Tension) type specimens. One part of
the tested specimens was made of PLA (polylactic acid) material on a FDM (Fused Deposition Modeling) type
printer while the other part of the tested specimens was made of photopolymer resin (Photopolymer resin Gray,
FLGPGR04 by FormLabs) made by stereo lithography technique on an SLA (Stereolithography Apparatus)
printer. The examination confirmed the repeatability of the results and on the basis of them the parameters of
fracture mechanics for both types of specimens were determined.
PB  - Innovation Center of Faculty of Mechanical Engineering
C3  - CNN TECH 2022 „ International Conference of Experimental and Numerical Investigations and New Technologies “   Zlatibor, July 05 – July 08, 2022
T1  - COMPARISON OF FRACTURE MECHANICS PARAMETERS DURING TESTING OF SENT SPECIMENS MADE BY DIFFERENT ADDITIVE PRODUCTION TECHNIQUE
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7280
ER  - 

@conference{
author = "Trajković, Isaak and Milošević, Miloš and Sedmak, Aleksandar and Rakin, Marko and Marsavina, Liviu and Medjo, Bojan",
year = "2022",
abstract = "How and in which field products made by additive technologies can be applied depends not only on the type
of material and manufacturing technique but also on the economic aspect. The most affordable materials and
techniques are often used for rapid product development. These products are very often a replacement or
temporary part in a machine assembly. The integrity of such an assembly due to the mechanical characteristics
of the materials used in additive manufacturing most often depends on the element made by additive
manufacturing. In order to understand the question of the integrity of the element itself and on that basis to
choose the technique and material for the production of elements, it was necessary to compare the parameters
of fracture mechanics for two types of materials. In this study, the results of fracture mechanical parameters
will be presented. Parameters of fracture mechanics was obtained by using the Aramis 2M system by the
method of digital image correlation (DIC) and a universal machine for testing the mechanical properties of
materials (Shimadzu AGS-X 100kN) on SENT (Single Edge Notched Tension) type specimens. One part of
the tested specimens was made of PLA (polylactic acid) material on a FDM (Fused Deposition Modeling) type
printer while the other part of the tested specimens was made of photopolymer resin (Photopolymer resin Gray,
FLGPGR04 by FormLabs) made by stereo lithography technique on an SLA (Stereolithography Apparatus)
printer. The examination confirmed the repeatability of the results and on the basis of them the parameters of
fracture mechanics for both types of specimens were determined.",
publisher = "Innovation Center of Faculty of Mechanical Engineering",
journal = "CNN TECH 2022 „ International Conference of Experimental and Numerical Investigations and New Technologies “   Zlatibor, July 05 – July 08, 2022",
title = "COMPARISON OF FRACTURE MECHANICS PARAMETERS DURING TESTING OF SENT SPECIMENS MADE BY DIFFERENT ADDITIVE PRODUCTION TECHNIQUE",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7280"
}

Trajković, I., Milošević, M., Sedmak, A., Rakin, M., Marsavina, L.,& Medjo, B.. (2022). COMPARISON OF FRACTURE MECHANICS PARAMETERS DURING TESTING OF SENT SPECIMENS MADE BY DIFFERENT ADDITIVE PRODUCTION TECHNIQUE. in CNN TECH 2022 „ International Conference of Experimental and Numerical Investigations and New Technologies “   Zlatibor, July 05 – July 08, 2022
Innovation Center of Faculty of Mechanical Engineering..
https://hdl.handle.net/21.15107/rcub_machinery_7280

Trajković I, Milošević M, Sedmak A, Rakin M, Marsavina L, Medjo B. COMPARISON OF FRACTURE MECHANICS PARAMETERS DURING TESTING OF SENT SPECIMENS MADE BY DIFFERENT ADDITIVE PRODUCTION TECHNIQUE. in CNN TECH 2022 „ International Conference of Experimental and Numerical Investigations and New Technologies “   Zlatibor, July 05 – July 08, 2022. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_7280 .

Trajković, Isaak, Milošević, Miloš, Sedmak, Aleksandar, Rakin, Marko, Marsavina, Liviu, Medjo, Bojan, "COMPARISON OF FRACTURE MECHANICS PARAMETERS DURING TESTING OF SENT SPECIMENS MADE BY DIFFERENT ADDITIVE PRODUCTION TECHNIQUE" in CNN TECH 2022 „ International Conference of Experimental and Numerical Investigations and New Technologies “   Zlatibor, July 05 – July 08, 2022 (2022),
https://hdl.handle.net/21.15107/rcub_machinery_7280 .

TY  - CONF
AU  - Milovanović, Aleksa
AU  - Golubović, Zorana
AU  - Trajković, Isaak
AU  - Sedmak, Aleksandar
AU  - Milošević, Miloš
AU  - Valean, E.
AU  - Marsavina, Liviu
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3819
AB  - The majority of manufacturers of polymer filaments for FDM technology rely their datasheets only on tensile tests, so their documentation usually lacks any data concerning fracture mechanics parameters. Having in mind the importance of fracture mechanics parameters in material design and application e.g., plane-strain fracture toughness, and the fact that it can be measured using only standard tensile grips, or three-point bending test fixture on a regular tensile testing machine, this practice offers vital information for AM components carrying the load. Anyhow, it is not always a simple task to satisfy all requirements of the standard for plane-strain fracture toughness assessment of plastic materials (ASTM D5045-14), as in the case of FDM technology due to many printing parameters that not only influence fracture toughness results, but also can question the eligibility of test results if crack propagation deviates from the expected path or if the specimens don't meet the size criterion necessary for achieving the plane-strain condition. These problems are tackled in this research on PLA polymer, a material widely used in FDM technology. For this research SENB specimens are prepared according to ASTM D5045-14 standard and tested on tensile testing machine using three-point bending test fixture
PB  - Elsevier B.V.
C3  - Procedia Structural Integrity
T1  - Influence of printing parameters on the eligibility of plane-strain fracture toughness results for PLA polymer
EP  - 297
IS  - C
SP  - 290
VL  - 41
DO  - 10.1016/j.prostr.2022.05.034
ER  - 

@conference{
author = "Milovanović, Aleksa and Golubović, Zorana and Trajković, Isaak and Sedmak, Aleksandar and Milošević, Miloš and Valean, E. and Marsavina, Liviu",
year = "2022",
abstract = "The majority of manufacturers of polymer filaments for FDM technology rely their datasheets only on tensile tests, so their documentation usually lacks any data concerning fracture mechanics parameters. Having in mind the importance of fracture mechanics parameters in material design and application e.g., plane-strain fracture toughness, and the fact that it can be measured using only standard tensile grips, or three-point bending test fixture on a regular tensile testing machine, this practice offers vital information for AM components carrying the load. Anyhow, it is not always a simple task to satisfy all requirements of the standard for plane-strain fracture toughness assessment of plastic materials (ASTM D5045-14), as in the case of FDM technology due to many printing parameters that not only influence fracture toughness results, but also can question the eligibility of test results if crack propagation deviates from the expected path or if the specimens don't meet the size criterion necessary for achieving the plane-strain condition. These problems are tackled in this research on PLA polymer, a material widely used in FDM technology. For this research SENB specimens are prepared according to ASTM D5045-14 standard and tested on tensile testing machine using three-point bending test fixture",
publisher = "Elsevier B.V.",
journal = "Procedia Structural Integrity",
title = "Influence of printing parameters on the eligibility of plane-strain fracture toughness results for PLA polymer",
pages = "297-290",
number = "C",
volume = "41",
doi = "10.1016/j.prostr.2022.05.034"
}

Milovanović, A., Golubović, Z., Trajković, I., Sedmak, A., Milošević, M., Valean, E.,& Marsavina, L.. (2022). Influence of printing parameters on the eligibility of plane-strain fracture toughness results for PLA polymer. in Procedia Structural Integrity
Elsevier B.V.., 41(C), 290-297.
https://doi.org/10.1016/j.prostr.2022.05.034

Milovanović A, Golubović Z, Trajković I, Sedmak A, Milošević M, Valean E, Marsavina L. Influence of printing parameters on the eligibility of plane-strain fracture toughness results for PLA polymer. in Procedia Structural Integrity. 2022;41(C):290-297.
doi:10.1016/j.prostr.2022.05.034 .

Milovanović, Aleksa, Golubović, Zorana, Trajković, Isaak, Sedmak, Aleksandar, Milošević, Miloš, Valean, E., Marsavina, Liviu, "Influence of printing parameters on the eligibility of plane-strain fracture toughness results for PLA polymer" in Procedia Structural Integrity, 41, no. C (2022):290-297,
https://doi.org/10.1016/j.prostr.2022.05.034 . .

TY  - CONF
AU  - Trajković, Isaak
AU  - Milovanović, Aleksa
AU  - Jevtić, Ivana
AU  - Travica, Milan
AU  - Marsavina, Liviu
AU  - Međo, Bojan
AU  - Náhlík, Luboš
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7366
AB  - In order to characterize the fracture toughness of single edge notched tension (SENT) specimens, this paper describes the experimental determination of fracture mechanics parameters such as crack mouth opening displacement (CMOD) and crack type opening displacement (CTOD) on SENT specimen samples. Additive production techniques were used to make these specimens. This is an FDM (Fused Deposition Modeling) technique and the material used is polylactide amide (PLA, German RepRap Premium Filament). The experiment was performed on two models of test specimens that differed in geometry. The specimens differed in the length of the notche and crack, while the cross-sectional area of the specimens was equal. The experiment was performed at room temperature and relative humidity of 40%, a few days after production. Universal machine for testing the mechanical properties of materials (Shimadzu AGS-X 100kN) in the control of displacement at a speed of 0.5mm / min was used. Using the Aramis 2M system, digital image correlation was used to obtain CMOD and CTOD (δ-5) values according to a standard procedure using a point-point distance command that measures the distance between points with an accuracy of one thousandth of a millimeter. The repeatability of the results indicates the same trend in the fracture of SENT specimens made by this technique of additive production and from this material as the results with low values of standard deviation.
C3  - International conference of experimental and numerical investigations and new technologies (2021 ; Zlatibor)
T1  - Monitoring of fracture mechanics parameters on single edge notched tension specimens made of PLA material
SP  - 18
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7366
ER  - 

@conference{
author = "Trajković, Isaak and Milovanović, Aleksa and Jevtić, Ivana and Travica, Milan and Marsavina, Liviu and Međo, Bojan and Náhlík, Luboš",
year = "2021",
abstract = "In order to characterize the fracture toughness of single edge notched tension (SENT) specimens, this paper describes the experimental determination of fracture mechanics parameters such as crack mouth opening displacement (CMOD) and crack type opening displacement (CTOD) on SENT specimen samples. Additive production techniques were used to make these specimens. This is an FDM (Fused Deposition Modeling) technique and the material used is polylactide amide (PLA, German RepRap Premium Filament). The experiment was performed on two models of test specimens that differed in geometry. The specimens differed in the length of the notche and crack, while the cross-sectional area of the specimens was equal. The experiment was performed at room temperature and relative humidity of 40%, a few days after production. Universal machine for testing the mechanical properties of materials (Shimadzu AGS-X 100kN) in the control of displacement at a speed of 0.5mm / min was used. Using the Aramis 2M system, digital image correlation was used to obtain CMOD and CTOD (δ-5) values according to a standard procedure using a point-point distance command that measures the distance between points with an accuracy of one thousandth of a millimeter. The repeatability of the results indicates the same trend in the fracture of SENT specimens made by this technique of additive production and from this material as the results with low values of standard deviation.",
journal = "International conference of experimental and numerical investigations and new technologies (2021 ; Zlatibor)",
title = "Monitoring of fracture mechanics parameters on single edge notched tension specimens made of PLA material",
pages = "18",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7366"
}

Trajković, I., Milovanović, A., Jevtić, I., Travica, M., Marsavina, L., Međo, B.,& Náhlík, L.. (2021). Monitoring of fracture mechanics parameters on single edge notched tension specimens made of PLA material. in International conference of experimental and numerical investigations and new technologies (2021 ; Zlatibor), 18.
https://hdl.handle.net/21.15107/rcub_machinery_7366

Trajković I, Milovanović A, Jevtić I, Travica M, Marsavina L, Međo B, Náhlík L. Monitoring of fracture mechanics parameters on single edge notched tension specimens made of PLA material. in International conference of experimental and numerical investigations and new technologies (2021 ; Zlatibor). 2021;:18.
https://hdl.handle.net/21.15107/rcub_machinery_7366 .

Trajković, Isaak, Milovanović, Aleksa, Jevtić, Ivana, Travica, Milan, Marsavina, Liviu, Međo, Bojan, Náhlík, Luboš, "Monitoring of fracture mechanics parameters on single edge notched tension specimens made of PLA material" in International conference of experimental and numerical investigations and new technologies (2021 ; Zlatibor) (2021):18,
https://hdl.handle.net/21.15107/rcub_machinery_7366 .

TY  - JOUR
AU  - Correia, Jose A. F. O.
AU  - Berto, Filippo
AU  - Ayatollahi, Majid
AU  - Marsavina, Liviu
AU  - Kotousov, Andrei
AU  - Sedmak, Aleksandar
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3108
PB  - Wiley, Hoboken
T2  - Fatigue & Fracture of Engineering Materials & Structures
T1  - Guest editorial: Advanced design and fatigue assessment of structural components
EP  - 1218
IS  - 6
SP  - 1217
VL  - 42
DO  - 10.1111/ffe.13026
ER  - 

@article{
author = "Correia, Jose A. F. O. and Berto, Filippo and Ayatollahi, Majid and Marsavina, Liviu and Kotousov, Andrei and Sedmak, Aleksandar",
year = "2019",
publisher = "Wiley, Hoboken",
journal = "Fatigue & Fracture of Engineering Materials & Structures",
title = "Guest editorial: Advanced design and fatigue assessment of structural components",
pages = "1218-1217",
number = "6",
volume = "42",
doi = "10.1111/ffe.13026"
}

Correia, J. A. F. O., Berto, F., Ayatollahi, M., Marsavina, L., Kotousov, A.,& Sedmak, A.. (2019). Guest editorial: Advanced design and fatigue assessment of structural components. in Fatigue & Fracture of Engineering Materials & Structures
Wiley, Hoboken., 42(6), 1217-1218.
https://doi.org/10.1111/ffe.13026

Correia JAFO, Berto F, Ayatollahi M, Marsavina L, Kotousov A, Sedmak A. Guest editorial: Advanced design and fatigue assessment of structural components. in Fatigue & Fracture of Engineering Materials & Structures. 2019;42(6):1217-1218.
doi:10.1111/ffe.13026 .

Correia, Jose A. F. O., Berto, Filippo, Ayatollahi, Majid, Marsavina, Liviu, Kotousov, Andrei, Sedmak, Aleksandar, "Guest editorial: Advanced design and fatigue assessment of structural components" in Fatigue & Fracture of Engineering Materials & Structures, 42, no. 6 (2019):1217-1218,
https://doi.org/10.1111/ffe.13026 . .