TY  - JOUR
AU  - Mitrović, Nenad
AU  - Golubović, Zorana
AU  - Mitrović, Aleksandra
AU  - Travica, Milan
AU  - Trajković, Isaak
AU  - Milošević, Miloš
AU  - Petrović, Aleksandar
PY  - 2024
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7781
AB  - The three-point bending test is a valuable method for evaluating the mechanical properties of 3D-printed biomaterials, which can be used in various applications. The use of 3D printing in specimen preparation enables precise control over material composition and microstructure, facilitating the investigation of different printing parameters and advanced materials. The traditional approach to analyzing the mechanical properties of a material using a three-point bending test has the disadvantage that it provides only global information about the material’s behavior. This means that it does not provide detailed insight into the local strain distribution within the material. However, the 2D Digital Image Correlation (DIC) method offers additional insight, especially in terms of strain localization. DIC is an optical technique that measures full-field displacements and strains on the surface of a sample. PLA and enhanced PLA-X material were utilized to create three-point bending samples. The aim of this paper was to analyze and compare the influence of aging on the mechanical properties of PLA and enhanced PLA-X materials using three-point bending coupled with the DIC method. The results showed statistically significant differences between the PLA and PLA-X, for both the new and aged materials. The aged PLA samples had the highest average value of maximal force around 68 N, which was an increase of 8.8% compared to the new PLA samples. On the other hand, the aged PLA-X material had an increase of 7.7% in the average maximal force compared to the new PLA-X samples. When comparing the two materials, the PLA samples had higher maximal force values, 6.2% for the new samples, and 7.3% for the aged samples. The DIC results showed that both the new PLA and PLA-X samples endured higher strain values at Points 1 and 2 than the aged ones, except for the aged PLA-X sample at Point 2, where the new sample had higher strain values. However, for the first 5 min of the experiment, both materials exhibited identical behavior, after which point significant differences started to occur for both materials, as well as at Points 1 and 2. A more profound comprehension of the biomechanical characteristics of both PLA and PLA-X material is essential to enhance the knowledge for potential biomedical applications. The DIC method was found to be a powerful tool for analyzing the deformation and failure behavior of samples and for complementing the traditional approach to material testing.
T2  - Micromachines
T1  - Influence of Aging on the Flexural Strength of PLA and PLA-X 3D-Printed Materials
IS  - 3
SP  - 395
VL  - 15
DO  - 10.3390/mi15030395
ER  - 

@article{
author = "Mitrović, Nenad and Golubović, Zorana and Mitrović, Aleksandra and Travica, Milan and Trajković, Isaak and Milošević, Miloš and Petrović, Aleksandar",
year = "2024",
abstract = "The three-point bending test is a valuable method for evaluating the mechanical properties of 3D-printed biomaterials, which can be used in various applications. The use of 3D printing in specimen preparation enables precise control over material composition and microstructure, facilitating the investigation of different printing parameters and advanced materials. The traditional approach to analyzing the mechanical properties of a material using a three-point bending test has the disadvantage that it provides only global information about the material’s behavior. This means that it does not provide detailed insight into the local strain distribution within the material. However, the 2D Digital Image Correlation (DIC) method offers additional insight, especially in terms of strain localization. DIC is an optical technique that measures full-field displacements and strains on the surface of a sample. PLA and enhanced PLA-X material were utilized to create three-point bending samples. The aim of this paper was to analyze and compare the influence of aging on the mechanical properties of PLA and enhanced PLA-X materials using three-point bending coupled with the DIC method. The results showed statistically significant differences between the PLA and PLA-X, for both the new and aged materials. The aged PLA samples had the highest average value of maximal force around 68 N, which was an increase of 8.8% compared to the new PLA samples. On the other hand, the aged PLA-X material had an increase of 7.7% in the average maximal force compared to the new PLA-X samples. When comparing the two materials, the PLA samples had higher maximal force values, 6.2% for the new samples, and 7.3% for the aged samples. The DIC results showed that both the new PLA and PLA-X samples endured higher strain values at Points 1 and 2 than the aged ones, except for the aged PLA-X sample at Point 2, where the new sample had higher strain values. However, for the first 5 min of the experiment, both materials exhibited identical behavior, after which point significant differences started to occur for both materials, as well as at Points 1 and 2. A more profound comprehension of the biomechanical characteristics of both PLA and PLA-X material is essential to enhance the knowledge for potential biomedical applications. The DIC method was found to be a powerful tool for analyzing the deformation and failure behavior of samples and for complementing the traditional approach to material testing.",
journal = "Micromachines",
title = "Influence of Aging on the Flexural Strength of PLA and PLA-X 3D-Printed Materials",
number = "3",
pages = "395",
volume = "15",
doi = "10.3390/mi15030395"
}

Mitrović, N., Golubović, Z., Mitrović, A., Travica, M., Trajković, I., Milošević, M.,& Petrović, A.. (2024). Influence of Aging on the Flexural Strength of PLA and PLA-X 3D-Printed Materials. in Micromachines, 15(3), 395.
https://doi.org/10.3390/mi15030395

Mitrović N, Golubović Z, Mitrović A, Travica M, Trajković I, Milošević M, Petrović A. Influence of Aging on the Flexural Strength of PLA and PLA-X 3D-Printed Materials. in Micromachines. 2024;15(3):395.
doi:10.3390/mi15030395 .

Mitrović, Nenad, Golubović, Zorana, Mitrović, Aleksandra, Travica, Milan, Trajković, Isaak, Milošević, Miloš, Petrović, Aleksandar, "Influence of Aging on the Flexural Strength of PLA and PLA-X 3D-Printed Materials" in Micromachines, 15, no. 3 (2024):395,
https://doi.org/10.3390/mi15030395 . .

TY  - CHAP
AU  - Golubović, Zorana
AU  - Travica, Milan
AU  - Mitrović, Nenad
AU  - Trajković, Isaak
AU  - Milošević, Miloš
PY  - 2024
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7782
AB  - Additive manufacturing and 3D printing technologies are rapidly evolving and influencing changes in design, prototyping, engineering and manufacturing processes in various industries, including aerospace. In order to use 3D printing processes to produce parts with adequate and satisfactory mechanical properties for aircraft that are constantly exposed to extreme temperatures and environmental conditions, the temperature variations that occur must be taken into account. In this study, small-scale specimens of the thermoplastic polymer material polylactic acid (PLA) were printed using an FDM printer while a thermal imaging camera was used to record the temperature changes during the printing process. The aim was to determine the temperature changes during each step of the printing process of small specimens and to create a future model for testing the temperature distribution.
PB  - Springer
T2  - New Trends in Engineering Research
T1  - Development of a Method for Testing Temperature Distribution During 3D Printing of Specimens with Application in Aerospace Industry
EP  - 95
SP  - 90
VL  - 792
DO  - 10.1007/978-3-031-46432-4_7
ER  - 

@inbook{
author = "Golubović, Zorana and Travica, Milan and Mitrović, Nenad and Trajković, Isaak and Milošević, Miloš",
year = "2024",
abstract = "Additive manufacturing and 3D printing technologies are rapidly evolving and influencing changes in design, prototyping, engineering and manufacturing processes in various industries, including aerospace. In order to use 3D printing processes to produce parts with adequate and satisfactory mechanical properties for aircraft that are constantly exposed to extreme temperatures and environmental conditions, the temperature variations that occur must be taken into account. In this study, small-scale specimens of the thermoplastic polymer material polylactic acid (PLA) were printed using an FDM printer while a thermal imaging camera was used to record the temperature changes during the printing process. The aim was to determine the temperature changes during each step of the printing process of small specimens and to create a future model for testing the temperature distribution.",
publisher = "Springer",
journal = "New Trends in Engineering Research",
booktitle = "Development of a Method for Testing Temperature Distribution During 3D Printing of Specimens with Application in Aerospace Industry",
pages = "95-90",
volume = "792",
doi = "10.1007/978-3-031-46432-4_7"
}

Golubović, Z., Travica, M., Mitrović, N., Trajković, I.,& Milošević, M.. (2024). Development of a Method for Testing Temperature Distribution During 3D Printing of Specimens with Application in Aerospace Industry. in New Trends in Engineering Research
Springer., 792, 90-95.
https://doi.org/10.1007/978-3-031-46432-4_7

Golubović Z, Travica M, Mitrović N, Trajković I, Milošević M. Development of a Method for Testing Temperature Distribution During 3D Printing of Specimens with Application in Aerospace Industry. in New Trends in Engineering Research. 2024;792:90-95.
doi:10.1007/978-3-031-46432-4_7 .

Golubović, Zorana, Travica, Milan, Mitrović, Nenad, Trajković, Isaak, Milošević, Miloš, "Development of a Method for Testing Temperature Distribution During 3D Printing of Specimens with Application in Aerospace Industry" in New Trends in Engineering Research, 792 (2024):90-95,
https://doi.org/10.1007/978-3-031-46432-4_7 . .

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  - JOUR
AU  - Milošević, Miloš
AU  - Jevtić, Ivana
AU  - Trajković, Isaak
AU  - Zlatanović, Ivan
AU  - Mladenović, Goran
AU  - Korolija, Nenad
PY  - 2024
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7766
AB  - The texture of food plays a vital role in its overall quality, affecting both sensory experience and functional aspects, such as processing and preservation. To study texture in the field of food science and technology, various analytical methods are used tomeasure mechanical properties such as hardness, cohesiveness, and viscosity. One widely utilized technique for evaluating the texture of solid foods, particularly those with high firmness or brittleness such as dried vegetables, is compression testing. Here, a force is applied to a food sample until it deforms or fractures. In this particular study, dried onions, carrots, and peppers were chosen as test samples to investigate their texture and compression properties. To perform the tests, the researchers employed a Shimadzu AGS-X universal testing machine equipped with a 1 kN load cell capacity. This machine allowed them to compress the samples and measure the force required to achieve a specific deformation. The obtained results revealed that the texture and compression properties of the
dried vegetables were significantly influenced by the specific part of the vegetable being tested. For instance, when examining the dried onions, a notable disparity was observed between the inner and outer parts. The basal plate of the onion, in particular, exhibited much greater hardness compared to the middle portion of the dried onion. Consequently, breaking the sample required a higher compression force. This discovery implies that the texture and compression properties of dried vegetables are closely tied to their inherent characteristics, internal structure, and
composition.
PB  - Springer
T2  - New Trends in Engineering Research Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2023
T1  - Determination of Compression Response for Various Dried Vegetables
EP  - 104
SP  - 96
VL  - 792
DO  - 10.1007/978-3-031-46432-4_8
ER  - 

@article{
author = "Milošević, Miloš and Jevtić, Ivana and Trajković, Isaak and Zlatanović, Ivan and Mladenović, Goran and Korolija, Nenad",
year = "2024",
abstract = "The texture of food plays a vital role in its overall quality, affecting both sensory experience and functional aspects, such as processing and preservation. To study texture in the field of food science and technology, various analytical methods are used tomeasure mechanical properties such as hardness, cohesiveness, and viscosity. One widely utilized technique for evaluating the texture of solid foods, particularly those with high firmness or brittleness such as dried vegetables, is compression testing. Here, a force is applied to a food sample until it deforms or fractures. In this particular study, dried onions, carrots, and peppers were chosen as test samples to investigate their texture and compression properties. To perform the tests, the researchers employed a Shimadzu AGS-X universal testing machine equipped with a 1 kN load cell capacity. This machine allowed them to compress the samples and measure the force required to achieve a specific deformation. The obtained results revealed that the texture and compression properties of the
dried vegetables were significantly influenced by the specific part of the vegetable being tested. For instance, when examining the dried onions, a notable disparity was observed between the inner and outer parts. The basal plate of the onion, in particular, exhibited much greater hardness compared to the middle portion of the dried onion. Consequently, breaking the sample required a higher compression force. This discovery implies that the texture and compression properties of dried vegetables are closely tied to their inherent characteristics, internal structure, and
composition.",
publisher = "Springer",
journal = "New Trends in Engineering Research Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2023",
title = "Determination of Compression Response for Various Dried Vegetables",
pages = "104-96",
volume = "792",
doi = "10.1007/978-3-031-46432-4_8"
}

Milošević, M., Jevtić, I., Trajković, I., Zlatanović, I., Mladenović, G.,& Korolija, N.. (2024). Determination of Compression Response for Various Dried Vegetables. in New Trends in Engineering Research Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2023
Springer., 792, 96-104.
https://doi.org/10.1007/978-3-031-46432-4_8

Milošević M, Jevtić I, Trajković I, Zlatanović I, Mladenović G, Korolija N. Determination of Compression Response for Various Dried Vegetables. in New Trends in Engineering Research Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2023. 2024;792:96-104.
doi:10.1007/978-3-031-46432-4_8 .

Milošević, Miloš, Jevtić, Ivana, Trajković, Isaak, Zlatanović, Ivan, Mladenović, Goran, Korolija, Nenad, "Determination of Compression Response for Various Dried Vegetables" in New Trends in Engineering Research Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2023, 792 (2024):96-104,
https://doi.org/10.1007/978-3-031-46432-4_8 . .

TY  - JOUR
AU  - Jevtić, Ivana
AU  - Mladenović, Goran
AU  - Milošević, Miloš
AU  - Milovanović, Aleksa
AU  - Travica, Milan
AU  - Trajković, Isaak
PY  - 2024
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7764
AB  - The objective of this study is to examine the accuracy of dimensional measurements for parts produced using Additive Manufacturing (AM) technology. The specific 3D printer employed in this research is Fuse 1 (FormLabs, Summerville, MA). The printer operates on the Selective Laser Sintering (SLS) method, enabling the simultaneous creation of objects with diverse shapes and sizes, as long as they are printed at a minimum separation distance of 5 mm. The printing process involved a layer thickness of 110 microns. To assess the dimensional accuracy, a particular type of specimen adhering to the ISO 604 standard for compressive specimens was analyzed. These compressive specimens possess dimensions of Ø10 × 20 mm. Four sets of specimens were fabricated, differing in their printing orientation (horizontal or vertical) and printing location (edge or middle of the powder bed). Polyamide (PA 12) was the chosen material for printing the specimens, known to exhibit compressive strength values of 13/24/55 MPa at 1%/2%/5% strain, respectively. After printing, the specimens were subjected to a 3D scanner Atos Core 200. The most significant deviations observed across all four series of specimens were primarily in terms of height, ranging from 0.1 to 0.15 mm. In the case of vertically printed specimens positioned in the middle of the powder bed, variations in the width of the specimens were also noted.
PB  - Springer
T2  - New Trends in Engineering Research, Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2023
T1  - Dimensional Accuracy of Compressive Specimens Obtained by SLS Technology
EP  - 213
SP  - 206
VL  - 792
DO  - 10.1007/978-3-031-46432-4_16
ER  - 

@article{
author = "Jevtić, Ivana and Mladenović, Goran and Milošević, Miloš and Milovanović, Aleksa and Travica, Milan and Trajković, Isaak",
year = "2024",
abstract = "The objective of this study is to examine the accuracy of dimensional measurements for parts produced using Additive Manufacturing (AM) technology. The specific 3D printer employed in this research is Fuse 1 (FormLabs, Summerville, MA). The printer operates on the Selective Laser Sintering (SLS) method, enabling the simultaneous creation of objects with diverse shapes and sizes, as long as they are printed at a minimum separation distance of 5 mm. The printing process involved a layer thickness of 110 microns. To assess the dimensional accuracy, a particular type of specimen adhering to the ISO 604 standard for compressive specimens was analyzed. These compressive specimens possess dimensions of Ø10 × 20 mm. Four sets of specimens were fabricated, differing in their printing orientation (horizontal or vertical) and printing location (edge or middle of the powder bed). Polyamide (PA 12) was the chosen material for printing the specimens, known to exhibit compressive strength values of 13/24/55 MPa at 1%/2%/5% strain, respectively. After printing, the specimens were subjected to a 3D scanner Atos Core 200. The most significant deviations observed across all four series of specimens were primarily in terms of height, ranging from 0.1 to 0.15 mm. In the case of vertically printed specimens positioned in the middle of the powder bed, variations in the width of the specimens were also noted.",
publisher = "Springer",
journal = "New Trends in Engineering Research, Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2023",
title = "Dimensional Accuracy of Compressive Specimens Obtained by SLS Technology",
pages = "213-206",
volume = "792",
doi = "10.1007/978-3-031-46432-4_16"
}

Jevtić, I., Mladenović, G., Milošević, M., Milovanović, A., Travica, M.,& Trajković, I.. (2024). Dimensional Accuracy of Compressive Specimens Obtained by SLS Technology. in New Trends in Engineering Research, Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2023
Springer., 792, 206-213.
https://doi.org/10.1007/978-3-031-46432-4_16

Jevtić I, Mladenović G, Milošević M, Milovanović A, Travica M, Trajković I. Dimensional Accuracy of Compressive Specimens Obtained by SLS Technology. in New Trends in Engineering Research, Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2023. 2024;792:206-213.
doi:10.1007/978-3-031-46432-4_16 .

Jevtić, Ivana, Mladenović, Goran, Milošević, Miloš, Milovanović, Aleksa, Travica, Milan, Trajković, Isaak, "Dimensional Accuracy of Compressive Specimens Obtained by SLS Technology" in New Trends in Engineering Research, Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2023, 792 (2024):206-213,
https://doi.org/10.1007/978-3-031-46432-4_16 . .

TY  - JOUR
AU  - Jevtić, Ivana
AU  - Trajković, Isaak
AU  - Zlatanović, Ivan
AU  - Mladenović, Goran
AU  - Korolija, Nenad
AU  - Milošević, Miloš
PY  - 2024
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7765
AB  - The evaluation of food texture is an essential aspect of food quality control, directly influencing consumer acceptance and preference. Various methods have been developed to assess food texture, including sensory evaluation, rheological measurements, and instrumental analysis. Among the versatile instruments used for measuring the mechanical properties of food, the universal testing machine (UTM) stands out. Traditionally used in the field of materials science
and engineering, the possibility of applying UTM for evaluating food textures has gained significant attention in recent years. The UTM can perform compression, tension, bending, and shear tests on food samples, providing objective and quantifiable data on their mechanical properties. Compression testing involves measuring the force required to compress a food sample between two plates, shear testing measures the force required to cut through a food sample, while puncture testing measures the force required to puncture a food sample with a probe. This paper reviews the current state-of-the-art of UTM in the evaluation of food textures, including the types of tests that can be performed, the parameters that can be measured, and the challenges and limitations associated with the technique. The potential of utilizing UTMs in the food industry for quality control
and product development, instead of traditional sensory evaluation methods, is discussed, along with its advantages and disadvantages. Overall, UTM represents a promising tool for the objective evaluation of food textures, and further research is needed to optimize its application in this field.
PB  - Springer
T2  - New Trends in Engineering Research Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2023
T1  - The Possibility of Applying a Universal Testing Machine for Evaluating Food Textures
EP  - 229
SP  - 222
VL  - 792
DO  - 10.1007/978-3-031-46432-4_18
ER  - 

@article{
author = "Jevtić, Ivana and Trajković, Isaak and Zlatanović, Ivan and Mladenović, Goran and Korolija, Nenad and Milošević, Miloš",
year = "2024",
abstract = "The evaluation of food texture is an essential aspect of food quality control, directly influencing consumer acceptance and preference. Various methods have been developed to assess food texture, including sensory evaluation, rheological measurements, and instrumental analysis. Among the versatile instruments used for measuring the mechanical properties of food, the universal testing machine (UTM) stands out. Traditionally used in the field of materials science
and engineering, the possibility of applying UTM for evaluating food textures has gained significant attention in recent years. The UTM can perform compression, tension, bending, and shear tests on food samples, providing objective and quantifiable data on their mechanical properties. Compression testing involves measuring the force required to compress a food sample between two plates, shear testing measures the force required to cut through a food sample, while puncture testing measures the force required to puncture a food sample with a probe. This paper reviews the current state-of-the-art of UTM in the evaluation of food textures, including the types of tests that can be performed, the parameters that can be measured, and the challenges and limitations associated with the technique. The potential of utilizing UTMs in the food industry for quality control
and product development, instead of traditional sensory evaluation methods, is discussed, along with its advantages and disadvantages. Overall, UTM represents a promising tool for the objective evaluation of food textures, and further research is needed to optimize its application in this field.",
publisher = "Springer",
journal = "New Trends in Engineering Research Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2023",
title = "The Possibility of Applying a Universal Testing Machine for Evaluating Food Textures",
pages = "229-222",
volume = "792",
doi = "10.1007/978-3-031-46432-4_18"
}

Jevtić, I., Trajković, I., Zlatanović, I., Mladenović, G., Korolija, N.,& Milošević, M.. (2024). The Possibility of Applying a Universal Testing Machine for Evaluating Food Textures. in New Trends in Engineering Research Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2023
Springer., 792, 222-229.
https://doi.org/10.1007/978-3-031-46432-4_18

Jevtić I, Trajković I, Zlatanović I, Mladenović G, Korolija N, Milošević M. The Possibility of Applying a Universal Testing Machine for Evaluating Food Textures. in New Trends in Engineering Research Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2023. 2024;792:222-229.
doi:10.1007/978-3-031-46432-4_18 .

Jevtić, Ivana, Trajković, Isaak, Zlatanović, Ivan, Mladenović, Goran, Korolija, Nenad, Milošević, Miloš, "The Possibility of Applying a Universal Testing Machine for Evaluating Food Textures" in New Trends in Engineering Research Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2023, 792 (2024):222-229,
https://doi.org/10.1007/978-3-031-46432-4_18 . .

TY  - JOUR
AU  - Jevtić, Ivana
AU  - Stojanović, Jagoš
AU  - Milovanović, Aleksa
AU  - Trajković, Isaak
AU  - Milošević, Miloš
AU  - Mladenović, Goran
PY  - 2024
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7750
AB  - This research aims to determine how the orientation and placement of printing impacts the compressive strength of specimens manufactured by Selective Laser Sintering (SLS).
The research includes compressive specimens in which the CAD model dimensions are selected according to the ISO 604 standard, and specimen geometry Ø10x20 mm in bulk. All specimen configurations are additively manufactured in two different printing orientations, horizontal and vertical, and printed in the middle and on the edge of the powder bed. All specimens are additively manufactured using Polyamide 12 (PA 12) material on a Fuse 1 device (FormLabs, located in Summerville, MA). Compressive strength testing was carried out using a Shimadzu AGS-X universal testing machine (Shimadzu Corp., Kyoto, Japan).
T2  - STRUCTURAL INTEGRITY AND LIFE
T1  - PRINTING ORIENTATION AND PLACE INFLUENCING THE COMPRESSIVE STRENGTH OF POLYAMID 12 SPECIMENS OBTAINED BY SLS TECHNOLOGY
EP  - 7
IS  - 1
SP  - 3
VL  - 24
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7750
ER  - 

@article{
author = "Jevtić, Ivana and Stojanović, Jagoš and Milovanović, Aleksa and Trajković, Isaak and Milošević, Miloš and Mladenović, Goran",
year = "2024",
abstract = "This research aims to determine how the orientation and placement of printing impacts the compressive strength of specimens manufactured by Selective Laser Sintering (SLS).
The research includes compressive specimens in which the CAD model dimensions are selected according to the ISO 604 standard, and specimen geometry Ø10x20 mm in bulk. All specimen configurations are additively manufactured in two different printing orientations, horizontal and vertical, and printed in the middle and on the edge of the powder bed. All specimens are additively manufactured using Polyamide 12 (PA 12) material on a Fuse 1 device (FormLabs, located in Summerville, MA). Compressive strength testing was carried out using a Shimadzu AGS-X universal testing machine (Shimadzu Corp., Kyoto, Japan).",
journal = "STRUCTURAL INTEGRITY AND LIFE",
title = "PRINTING ORIENTATION AND PLACE INFLUENCING THE COMPRESSIVE STRENGTH OF POLYAMID 12 SPECIMENS OBTAINED BY SLS TECHNOLOGY",
pages = "7-3",
number = "1",
volume = "24",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7750"
}

Jevtić, I., Stojanović, J., Milovanović, A., Trajković, I., Milošević, M.,& Mladenović, G.. (2024). PRINTING ORIENTATION AND PLACE INFLUENCING THE COMPRESSIVE STRENGTH OF POLYAMID 12 SPECIMENS OBTAINED BY SLS TECHNOLOGY. in STRUCTURAL INTEGRITY AND LIFE, 24(1), 3-7.
https://hdl.handle.net/21.15107/rcub_machinery_7750

Jevtić I, Stojanović J, Milovanović A, Trajković I, Milošević M, Mladenović G. PRINTING ORIENTATION AND PLACE INFLUENCING THE COMPRESSIVE STRENGTH OF POLYAMID 12 SPECIMENS OBTAINED BY SLS TECHNOLOGY. in STRUCTURAL INTEGRITY AND LIFE. 2024;24(1):3-7.
https://hdl.handle.net/21.15107/rcub_machinery_7750 .

Jevtić, Ivana, Stojanović, Jagoš, Milovanović, Aleksa, Trajković, Isaak, Milošević, Miloš, Mladenović, Goran, "PRINTING ORIENTATION AND PLACE INFLUENCING THE COMPRESSIVE STRENGTH OF POLYAMID 12 SPECIMENS OBTAINED BY SLS TECHNOLOGY" in STRUCTURAL INTEGRITY AND LIFE, 24, no. 1 (2024):3-7,
https://hdl.handle.net/21.15107/rcub_machinery_7750 .

TY  - CONF
AU  - Jevtić, Ivana
AU  - Mladenović, Goran
AU  - Milošević, Miloš
AU  - Trajković, Isaak
AU  - Milovanović, Aleksa
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7372
AB  - SLS technology is a popular choice in various industries worldwide because of its ability to produce complex geometry components with less effort when compared to conventional methods. The technology involves using materials in powder forms, such as polyamides (PA), polystyrenes, thermoplastic elastomers, and polyaryletherketones. In this study, the research focuses on compressive PA12 specimens with CAD model dimensions selected according to the ISO 604 standard, with bulk dimensions of Ø10x20 [mm]. The study utilizes a Fuse 1 (FormLabs, Summerville, MA) 3D printer that employs the SLS technology. This printer is capable of producing objects with different shapes and dimensions simultaneously, provided that they are printed at a minimum distance of 5 [mm] apart. The research involves producing four batches of specimens, each differing in printing orientation (i.e., horizontal and vertical) and printing location (i.e., printed on the edge and in the middle of the powder bed). The printed specimens are scanned, and the obtained scans are compared with the original CAD model in the GOM Inspect program. The highest deviations in all four specimen series are in height, ranging from 0.1 up to 0.15 mm. In the case of vertical specimens printed in the middle of the powder bed, there are also deviations in the width of the specimen.
PB  - Innovation Center of Faculty of Mechanical Engineering, Belgrade, Serbia
C3  - International conference of experimental and numerical investigations and new technologies (2023 ; Zlatibor)
T1  - Deviations measurements of SLS PA material at compressive specimens
SP  - 8
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7372
ER  - 

@conference{
author = "Jevtić, Ivana and Mladenović, Goran and Milošević, Miloš and Trajković, Isaak and Milovanović, Aleksa",
year = "2023",
abstract = "SLS technology is a popular choice in various industries worldwide because of its ability to produce complex geometry components with less effort when compared to conventional methods. The technology involves using materials in powder forms, such as polyamides (PA), polystyrenes, thermoplastic elastomers, and polyaryletherketones. In this study, the research focuses on compressive PA12 specimens with CAD model dimensions selected according to the ISO 604 standard, with bulk dimensions of Ø10x20 [mm]. The study utilizes a Fuse 1 (FormLabs, Summerville, MA) 3D printer that employs the SLS technology. This printer is capable of producing objects with different shapes and dimensions simultaneously, provided that they are printed at a minimum distance of 5 [mm] apart. The research involves producing four batches of specimens, each differing in printing orientation (i.e., horizontal and vertical) and printing location (i.e., printed on the edge and in the middle of the powder bed). The printed specimens are scanned, and the obtained scans are compared with the original CAD model in the GOM Inspect program. The highest deviations in all four specimen series are in height, ranging from 0.1 up to 0.15 mm. In the case of vertical specimens printed in the middle of the powder bed, there are also deviations in the width of the specimen.",
publisher = "Innovation Center of Faculty of Mechanical Engineering, Belgrade, Serbia",
journal = "International conference of experimental and numerical investigations and new technologies (2023 ; Zlatibor)",
title = "Deviations measurements of SLS PA material at compressive specimens",
pages = "8",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7372"
}

Jevtić, I., Mladenović, G., Milošević, M., Trajković, I.,& Milovanović, A.. (2023). Deviations measurements of SLS PA material at compressive specimens. in International conference of experimental and numerical investigations and new technologies (2023 ; Zlatibor)
Innovation Center of Faculty of Mechanical Engineering, Belgrade, Serbia., 8.
https://hdl.handle.net/21.15107/rcub_machinery_7372

Jevtić I, Mladenović G, Milošević M, Trajković I, Milovanović A. Deviations measurements of SLS PA material at compressive specimens. in International conference of experimental and numerical investigations and new technologies (2023 ; Zlatibor). 2023;:8.
https://hdl.handle.net/21.15107/rcub_machinery_7372 .

Jevtić, Ivana, Mladenović, Goran, Milošević, Miloš, Trajković, Isaak, Milovanović, Aleksa, "Deviations measurements of SLS PA material at compressive specimens" in International conference of experimental and numerical investigations and new technologies (2023 ; Zlatibor) (2023):8,
https://hdl.handle.net/21.15107/rcub_machinery_7372 .

TY  - CONF
AU  - Trajković, Isaak
AU  - Milošević, Miloš
AU  - Mitrović, Nenad
AU  - Sedmak, Aleksandar
AU  - Rakin, Marko
AU  - Međo, Bojan
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7700
AB  - A global problem for industrial plants that contain process equipment operating under high pressure is the assessment of the integrity of the equipment, specifically the pipelines. Standard procedures for determining fracture mechanics parameters (ASTM E1820) for materials used in pressure piping construction cannot be applied to most thin-wall pressure components. One of the solutions to this problem is the introduction of new procedures and geometries of test specimens. In order to understand the nature of the behavior of the specimens and to determine the parameters whose critical values are important for integrity assessment of the pipeline under pressure, a detailed analysis of the model of the non-standard ring-shaped specimen is
necessary. This paper will present the results of the analysis of fracture mechanics parameters obtained by the finite element method using the Simulia Abaqus software package. The properties of the material used in the software correspond to the properties of the P235TR1 pipeline material obtained by tensile testing on cylindrical samples with initial crack. The ratio of crack length (a) to sample width (W) corresponds to standard sample geometries and varies from a/W = 0.4 to a/W = 0.6. The values obtained from SENT (Single Edge Notched Tension) models with the same cross-section and a/W ratio were taken as reference values in relation to which the comparison is made. As a result of this research, the ratio of fracture mechanics parameters of the ring-shaped model (Pipe Ring Notched Tension – PRNT specimen) with a crack and the SENT model was obtained. The values of the J-integral were also obtained, distribution of values along the crack front does not correspond to the profile obtained on the SENT model. As a result of this test, a procedure for determining the critical value of the J-integral for models corresponding to the tested P235TR1 pipe samples was established, which is an important step in establishing a new procedure for testing of pipeline materials.
PB  - University of Belgrade - Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2023
T1  - THE INFLUENCE OF CYLLINDRICAL SPECIMEN GEOMETRY ON THE VALUES OF FRACTURE MECHANICS PARAMETERS
SP  - 26
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7700
ER  - 

@conference{
author = "Trajković, Isaak and Milošević, Miloš and Mitrović, Nenad and Sedmak, Aleksandar and Rakin, Marko and Međo, Bojan",
year = "2023",
abstract = "A global problem for industrial plants that contain process equipment operating under high pressure is the assessment of the integrity of the equipment, specifically the pipelines. Standard procedures for determining fracture mechanics parameters (ASTM E1820) for materials used in pressure piping construction cannot be applied to most thin-wall pressure components. One of the solutions to this problem is the introduction of new procedures and geometries of test specimens. In order to understand the nature of the behavior of the specimens and to determine the parameters whose critical values are important for integrity assessment of the pipeline under pressure, a detailed analysis of the model of the non-standard ring-shaped specimen is
necessary. This paper will present the results of the analysis of fracture mechanics parameters obtained by the finite element method using the Simulia Abaqus software package. The properties of the material used in the software correspond to the properties of the P235TR1 pipeline material obtained by tensile testing on cylindrical samples with initial crack. The ratio of crack length (a) to sample width (W) corresponds to standard sample geometries and varies from a/W = 0.4 to a/W = 0.6. The values obtained from SENT (Single Edge Notched Tension) models with the same cross-section and a/W ratio were taken as reference values in relation to which the comparison is made. As a result of this research, the ratio of fracture mechanics parameters of the ring-shaped model (Pipe Ring Notched Tension – PRNT specimen) with a crack and the SENT model was obtained. The values of the J-integral were also obtained, distribution of values along the crack front does not correspond to the profile obtained on the SENT model. As a result of this test, a procedure for determining the critical value of the J-integral for models corresponding to the tested P235TR1 pipe samples was established, which is an important step in establishing a new procedure for testing of pipeline materials.",
publisher = "University of Belgrade - Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2023",
title = "THE INFLUENCE OF CYLLINDRICAL SPECIMEN GEOMETRY ON THE VALUES OF FRACTURE MECHANICS PARAMETERS",
pages = "26",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7700"
}

Trajković, I., Milošević, M., Mitrović, N., Sedmak, A., Rakin, M.,& Međo, B.. (2023). THE INFLUENCE OF CYLLINDRICAL SPECIMEN GEOMETRY ON THE VALUES OF FRACTURE MECHANICS PARAMETERS. in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2023
University of Belgrade - Faculty of Mechanical Engineering., 26.
https://hdl.handle.net/21.15107/rcub_machinery_7700

Trajković I, Milošević M, Mitrović N, Sedmak A, Rakin M, Međo B. THE INFLUENCE OF CYLLINDRICAL SPECIMEN GEOMETRY ON THE VALUES OF FRACTURE MECHANICS PARAMETERS. in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2023. 2023;:26.
https://hdl.handle.net/21.15107/rcub_machinery_7700 .

Trajković, Isaak, Milošević, Miloš, Mitrović, Nenad, Sedmak, Aleksandar, Rakin, Marko, Međo, Bojan, "THE INFLUENCE OF CYLLINDRICAL SPECIMEN GEOMETRY ON THE VALUES OF FRACTURE MECHANICS PARAMETERS" in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2023 (2023):26,
https://hdl.handle.net/21.15107/rcub_machinery_7700 .

TY  - CONF
AU  - Mitrović, Nenad
AU  - Golubović, Zorana
AU  - Mitrović, Aleksandra
AU  - Travica, Milan
AU  - Trajković, Isaak
AU  - Milošević, Miloš
AU  - Petrović, Aleksandar
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7705
AB  - The three-point bending test is a widely used and important method for evaluating the mechanical properties of materials. Its versatility, applicability, and ability to provide valuable information on flexural strength, stiffness, and fracture toughness make it a valuable tool in materials science, engineering, and biomedical research. Digital Image Correlation (DIC) provides a high resolution and full-field measurement of deformation during the bending process. DIC also allows for the calculation of strain fields, which can be used to determine material properties such as Young's modulus and Poisson's ratio. This is particularly important in understanding the strain distribution and identifying potential failure mechanisms in the material. In this paper, the potential application of the 2D Digital Image Correlation method on three-point bending tests is presented.
PB  - The Academy of Applied Technical Studies "Belgrade"
C3  - International Scientific and Professional Conference Politehnika 2023
T1  - APPLICATION OF 2D DIGITAL IMAGE CORRELATION METHOD ON THREE-POINT BENDING IN MATERIAL TESTING
EP  - 1071
SP  - 1068
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7705
ER  - 

@conference{
author = "Mitrović, Nenad and Golubović, Zorana and Mitrović, Aleksandra and Travica, Milan and Trajković, Isaak and Milošević, Miloš and Petrović, Aleksandar",
year = "2023",
abstract = "The three-point bending test is a widely used and important method for evaluating the mechanical properties of materials. Its versatility, applicability, and ability to provide valuable information on flexural strength, stiffness, and fracture toughness make it a valuable tool in materials science, engineering, and biomedical research. Digital Image Correlation (DIC) provides a high resolution and full-field measurement of deformation during the bending process. DIC also allows for the calculation of strain fields, which can be used to determine material properties such as Young's modulus and Poisson's ratio. This is particularly important in understanding the strain distribution and identifying potential failure mechanisms in the material. In this paper, the potential application of the 2D Digital Image Correlation method on three-point bending tests is presented.",
publisher = "The Academy of Applied Technical Studies "Belgrade"",
journal = "International Scientific and Professional Conference Politehnika 2023",
title = "APPLICATION OF 2D DIGITAL IMAGE CORRELATION METHOD ON THREE-POINT BENDING IN MATERIAL TESTING",
pages = "1071-1068",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7705"
}

Mitrović, N., Golubović, Z., Mitrović, A., Travica, M., Trajković, I., Milošević, M.,& Petrović, A.. (2023). APPLICATION OF 2D DIGITAL IMAGE CORRELATION METHOD ON THREE-POINT BENDING IN MATERIAL TESTING. in International Scientific and Professional Conference Politehnika 2023
The Academy of Applied Technical Studies "Belgrade"., 1068-1071.
https://hdl.handle.net/21.15107/rcub_machinery_7705

Mitrović N, Golubović Z, Mitrović A, Travica M, Trajković I, Milošević M, Petrović A. APPLICATION OF 2D DIGITAL IMAGE CORRELATION METHOD ON THREE-POINT BENDING IN MATERIAL TESTING. in International Scientific and Professional Conference Politehnika 2023. 2023;:1068-1071.
https://hdl.handle.net/21.15107/rcub_machinery_7705 .

Mitrović, Nenad, Golubović, Zorana, Mitrović, Aleksandra, Travica, Milan, Trajković, Isaak, Milošević, Miloš, Petrović, Aleksandar, "APPLICATION OF 2D DIGITAL IMAGE CORRELATION METHOD ON THREE-POINT BENDING IN MATERIAL TESTING" in International Scientific and Professional Conference Politehnika 2023 (2023):1068-1071,
https://hdl.handle.net/21.15107/rcub_machinery_7705 .

TY  - JOUR
AU  - Golubović, Zorana
AU  - Travica, Milan
AU  - Trajković, Isaak
AU  - Petrović, Aleksandar
AU  - Mišković, Žarko
AU  - Mitrović, Nenad
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4705
AB  - Fused deposition modeling is one of the most widely used 3-D printing technologies, among other additive manufacturing processes, because it is easy to use,
can produce parts faster, and the cost of the finished part is low. Printing processes and finished parts are often studied and characterized using different
techniques to collect mechanical, numerical, thermal and dimensional data, with
the aim of improving and optimizing the result. The first part of this research is
based on the observation of temperature changes with a thermal imaging camera
during the fused deposition modeling printing process and during the cooling
process after printing. Specimens of polylactic acid and polylactic acid-X improved with second-phase particles were prepared to compare the thermal and
dimensional properties of the two materials. The obtained results determined the
characteristic temperature behavior of the materials. In the second part of the research, a 3-D optical scanner was used to verify the stability and accuracy of the
printed specimens over time. The proposed measurement period showed that stabilization of the parameters takes place, and further follow-up should be performed thereafter.
PB  - Beograd : Institut za nuklearne nauke Vinča
T2  - Thermal Science
T1  - Investigation of thermal and dimensional behavior of 3-D printed materials using thermal imaging and 3-D scanning
EP  - 31
SP  - 21
VL  - 27
DO  - 10.2298/TSCI2301021G
ER  - 

@article{
author = "Golubović, Zorana and Travica, Milan and Trajković, Isaak and Petrović, Aleksandar and Mišković, Žarko and Mitrović, Nenad",
year = "2023",
abstract = "Fused deposition modeling is one of the most widely used 3-D printing technologies, among other additive manufacturing processes, because it is easy to use,
can produce parts faster, and the cost of the finished part is low. Printing processes and finished parts are often studied and characterized using different
techniques to collect mechanical, numerical, thermal and dimensional data, with
the aim of improving and optimizing the result. The first part of this research is
based on the observation of temperature changes with a thermal imaging camera
during the fused deposition modeling printing process and during the cooling
process after printing. Specimens of polylactic acid and polylactic acid-X improved with second-phase particles were prepared to compare the thermal and
dimensional properties of the two materials. The obtained results determined the
characteristic temperature behavior of the materials. In the second part of the research, a 3-D optical scanner was used to verify the stability and accuracy of the
printed specimens over time. The proposed measurement period showed that stabilization of the parameters takes place, and further follow-up should be performed thereafter.",
publisher = "Beograd : Institut za nuklearne nauke Vinča",
journal = "Thermal Science",
title = "Investigation of thermal and dimensional behavior of 3-D printed materials using thermal imaging and 3-D scanning",
pages = "31-21",
volume = "27",
doi = "10.2298/TSCI2301021G"
}

Golubović, Z., Travica, M., Trajković, I., Petrović, A., Mišković, Ž.,& Mitrović, N.. (2023). Investigation of thermal and dimensional behavior of 3-D printed materials using thermal imaging and 3-D scanning. in Thermal Science
Beograd : Institut za nuklearne nauke Vinča., 27, 21-31.
https://doi.org/10.2298/TSCI2301021G

Golubović Z, Travica M, Trajković I, Petrović A, Mišković Ž, Mitrović N. Investigation of thermal and dimensional behavior of 3-D printed materials using thermal imaging and 3-D scanning. in Thermal Science. 2023;27:21-31.
doi:10.2298/TSCI2301021G .

Golubović, Zorana, Travica, Milan, Trajković, Isaak, Petrović, Aleksandar, Mišković, Žarko, Mitrović, Nenad, "Investigation of thermal and dimensional behavior of 3-D printed materials using thermal imaging and 3-D scanning" in Thermal Science, 27 (2023):21-31,
https://doi.org/10.2298/TSCI2301021G . .

TY  - JOUR
AU  - Petrov, Ljubiša
AU  - Bojović, Božica
AU  - Golubović, Zorana
AU  - Sedmak, Aleksandar
AU  - Mišković, Žarko
AU  - Trajković, Isaak
AU  - Milošević, Miloš
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7149
AB  - Since the beginnings of additive manufacturing (AM) in the 1980s, vat polymerization was the first and most intensively developing technology that enabled the production of very precise parts from photosensitive polymer resins. One of the most studied polymer materials is acrylonitrile butadiene styrene (ABS), but mostly in the form of filaments for the FDM (Fused Deposition Modelling) process. The objective of this research was to investigate in detail the mechanical properties of ABS resin specimens fabricated by stereolithography (SLA) and digital light processing (DLP). Specimen geometries were based on standards for tensile, threepoint bending, and compression tests. By combining deformation and mechanical tests with optical microscopic analyses of the morphology and fracture surface structures, as well as Shore A hardness measurements, a deeper insight into the behaviour of commercially available ABS resins was gained.
T2  - Structural Integrity and Life
T1  - Experimental Mechanical Characterization of Parts Manufactured by SLA and DLP Technologies
EP  - 121
IS  - 2
SP  - 117
VL  - 23
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7149
ER  - 

@article{
author = "Petrov, Ljubiša and Bojović, Božica and Golubović, Zorana and Sedmak, Aleksandar and Mišković, Žarko and Trajković, Isaak and Milošević, Miloš",
year = "2023",
abstract = "Since the beginnings of additive manufacturing (AM) in the 1980s, vat polymerization was the first and most intensively developing technology that enabled the production of very precise parts from photosensitive polymer resins. One of the most studied polymer materials is acrylonitrile butadiene styrene (ABS), but mostly in the form of filaments for the FDM (Fused Deposition Modelling) process. The objective of this research was to investigate in detail the mechanical properties of ABS resin specimens fabricated by stereolithography (SLA) and digital light processing (DLP). Specimen geometries were based on standards for tensile, threepoint bending, and compression tests. By combining deformation and mechanical tests with optical microscopic analyses of the morphology and fracture surface structures, as well as Shore A hardness measurements, a deeper insight into the behaviour of commercially available ABS resins was gained.",
journal = "Structural Integrity and Life",
title = "Experimental Mechanical Characterization of Parts Manufactured by SLA and DLP Technologies",
pages = "121-117",
number = "2",
volume = "23",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7149"
}

Petrov, L., Bojović, B., Golubović, Z., Sedmak, A., Mišković, Ž., Trajković, I.,& Milošević, M.. (2023). Experimental Mechanical Characterization of Parts Manufactured by SLA and DLP Technologies. in Structural Integrity and Life, 23(2), 117-121.
https://hdl.handle.net/21.15107/rcub_machinery_7149

Petrov L, Bojović B, Golubović Z, Sedmak A, Mišković Ž, Trajković I, Milošević M. Experimental Mechanical Characterization of Parts Manufactured by SLA and DLP Technologies. in Structural Integrity and Life. 2023;23(2):117-121.
https://hdl.handle.net/21.15107/rcub_machinery_7149 .

Petrov, Ljubiša, Bojović, Božica, Golubović, Zorana, Sedmak, Aleksandar, Mišković, Žarko, Trajković, Isaak, Milošević, Miloš, "Experimental Mechanical Characterization of Parts Manufactured by SLA and DLP Technologies" in Structural Integrity and Life, 23, no. 2 (2023):117-121,
https://hdl.handle.net/21.15107/rcub_machinery_7149 .

TY  - JOUR
AU  - Trajković, Isaak
AU  - Rakin, Marko
AU  - Milošević, Miloš
AU  - Mitrović, Nenad
AU  - Travica, Milan
AU  - Sedmak, Aleksandar
AU  - Međo, Bojan
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7231
AB  - In order to develop a non-standard method for determining the resistance to fracture and damage of pipeline materials, a new geometry of ring-shaped specimens with sharp notches or cracks has been defined. The need to develop a new method for testing of the specimens cut from the pipes arises due to the difficulties in determination of fracture mechanics parameters on thin-walled pressure pipelines, especially those with a smaller cross-section, by application of the standard procedures/specimens. Previous studies dealing with the topic of pipeline testing by non-standard methods are presented in the introductory part of the paper. In the experimental part of the research, tests on PRNT (Pipe Ring Notched Tension) and SENT (Single Edge Notched Tension) specimens are performed. Samples of these specimens were produced by SLS (Selective Laser Sintering) technique of additive production from PA12 (polyamide PA 2200) material. For the purpose of this study, a tool that is protected at the national level (in Serbia) as intellectual property is used for testing of the ring-shaped PRNT specimens. Tensile testing of both types of specimens is monitored by Aramis GOM 2M system; its operation is based on the method of digital image correlation, DIC. Additionally, finite element analyses are conducted on the PRNT and SENT geometries, enabling the calculation of the fracture mechanics parameter – Stress intensity factor K. It is concluded that the presented procedure based on the PRNT specimen has a good potential for use as a non-standard method for fracture resistance examination of pipeline materials. It can be performed on the specimens cut directly from the pipes (new or from exploitation). The dependence of the fracture resistance on the stress concentrator size is not pronounced, which means that the results depend dominantly on the material properties, rather than on geometry.
PB  - Engineering Fracture Mechanics
T2  - Engineering Fracture Mechanics
T1  - Selective laser sintered Pipe Ring Notched Tension specimens for examination of fracture properties of pipeline materials
IS  - 109573
VL  - 292
DO  - 10.1016/j.engfracmech.2023.109573
ER  - 

@article{
author = "Trajković, Isaak and Rakin, Marko and Milošević, Miloš and Mitrović, Nenad and Travica, Milan and Sedmak, Aleksandar and Međo, Bojan",
year = "2023",
abstract = "In order to develop a non-standard method for determining the resistance to fracture and damage of pipeline materials, a new geometry of ring-shaped specimens with sharp notches or cracks has been defined. The need to develop a new method for testing of the specimens cut from the pipes arises due to the difficulties in determination of fracture mechanics parameters on thin-walled pressure pipelines, especially those with a smaller cross-section, by application of the standard procedures/specimens. Previous studies dealing with the topic of pipeline testing by non-standard methods are presented in the introductory part of the paper. In the experimental part of the research, tests on PRNT (Pipe Ring Notched Tension) and SENT (Single Edge Notched Tension) specimens are performed. Samples of these specimens were produced by SLS (Selective Laser Sintering) technique of additive production from PA12 (polyamide PA 2200) material. For the purpose of this study, a tool that is protected at the national level (in Serbia) as intellectual property is used for testing of the ring-shaped PRNT specimens. Tensile testing of both types of specimens is monitored by Aramis GOM 2M system; its operation is based on the method of digital image correlation, DIC. Additionally, finite element analyses are conducted on the PRNT and SENT geometries, enabling the calculation of the fracture mechanics parameter – Stress intensity factor K. It is concluded that the presented procedure based on the PRNT specimen has a good potential for use as a non-standard method for fracture resistance examination of pipeline materials. It can be performed on the specimens cut directly from the pipes (new or from exploitation). The dependence of the fracture resistance on the stress concentrator size is not pronounced, which means that the results depend dominantly on the material properties, rather than on geometry.",
publisher = "Engineering Fracture Mechanics",
journal = "Engineering Fracture Mechanics",
title = "Selective laser sintered Pipe Ring Notched Tension specimens for examination of fracture properties of pipeline materials",
number = "109573",
volume = "292",
doi = "10.1016/j.engfracmech.2023.109573"
}

Trajković, I., Rakin, M., Milošević, M., Mitrović, N., Travica, M., Sedmak, A.,& Međo, B.. (2023). Selective laser sintered Pipe Ring Notched Tension specimens for examination of fracture properties of pipeline materials. in Engineering Fracture Mechanics
Engineering Fracture Mechanics., 292(109573).
https://doi.org/10.1016/j.engfracmech.2023.109573

Trajković I, Rakin M, Milošević M, Mitrović N, Travica M, Sedmak A, Međo B. Selective laser sintered Pipe Ring Notched Tension specimens for examination of fracture properties of pipeline materials. in Engineering Fracture Mechanics. 2023;292(109573).
doi:10.1016/j.engfracmech.2023.109573 .

Trajković, Isaak, Rakin, Marko, Milošević, Miloš, Mitrović, Nenad, Travica, Milan, Sedmak, Aleksandar, Međo, Bojan, "Selective laser sintered Pipe Ring Notched Tension specimens for examination of fracture properties of pipeline materials" in Engineering Fracture Mechanics, 292, no. 109573 (2023),
https://doi.org/10.1016/j.engfracmech.2023.109573 . .

TY  - JOUR
AU  - Jevtić, Ivana
AU  - Mladenović, Goran
AU  - Milovanović, Aleksa
AU  - Trajković, Isaak
AU  - Đurković, Marija
AU  - Korolija, Nenad
AU  - Milošević, Miloš
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7423
AB  - This article aims to investigate the mechanical characteristics of specimens fabricated using Selective Laser Sintering technology. The research covers flexural specimens, produced by PA12 materials. CAD model dimensions were selected according to the ISO 178 standard, and the chosen specimen geometry is 96 x 8 x 4 [mm] in bulk. All specimens were produced using a specialized machine Fuse 1 (FormLabs, Summerville, MA). Four specimen batches were produced, each with a different printing orientation (i.e. vertical and horizontal) and location on the printing plate (i.e. in the middle and on the edge of the powder bed). The specimens are tested using a Shimadzu universal machine for testing the mechanical characteristics of materials, AGS-X 100 kN, with a unique additional tool for testing 3-point bending specimens.
T2  - Science of Sintering
T1  - The influence of printing orientation on the flexural strength of PA 12 specimens produced by SLS
DO  - 10.2298/SOS230508031J
ER  - 

@article{
author = "Jevtić, Ivana and Mladenović, Goran and Milovanović, Aleksa and Trajković, Isaak and Đurković, Marija and Korolija, Nenad and Milošević, Miloš",
year = "2023",
abstract = "This article aims to investigate the mechanical characteristics of specimens fabricated using Selective Laser Sintering technology. The research covers flexural specimens, produced by PA12 materials. CAD model dimensions were selected according to the ISO 178 standard, and the chosen specimen geometry is 96 x 8 x 4 [mm] in bulk. All specimens were produced using a specialized machine Fuse 1 (FormLabs, Summerville, MA). Four specimen batches were produced, each with a different printing orientation (i.e. vertical and horizontal) and location on the printing plate (i.e. in the middle and on the edge of the powder bed). The specimens are tested using a Shimadzu universal machine for testing the mechanical characteristics of materials, AGS-X 100 kN, with a unique additional tool for testing 3-point bending specimens.",
journal = "Science of Sintering",
title = "The influence of printing orientation on the flexural strength of PA 12 specimens produced by SLS",
doi = "10.2298/SOS230508031J"
}

Jevtić, I., Mladenović, G., Milovanović, A., Trajković, I., Đurković, M., Korolija, N.,& Milošević, M.. (2023). The influence of printing orientation on the flexural strength of PA 12 specimens produced by SLS. in Science of Sintering.
https://doi.org/10.2298/SOS230508031J

Jevtić I, Mladenović G, Milovanović A, Trajković I, Đurković M, Korolija N, Milošević M. The influence of printing orientation on the flexural strength of PA 12 specimens produced by SLS. in Science of Sintering. 2023;.
doi:10.2298/SOS230508031J .

Jevtić, Ivana, Mladenović, Goran, Milovanović, Aleksa, Trajković, Isaak, Đurković, Marija, Korolija, Nenad, Milošević, Miloš, "The influence of printing orientation on the flexural strength of PA 12 specimens produced by SLS" in Science of Sintering (2023),
https://doi.org/10.2298/SOS230508031J . .

TY  - JOUR
AU  - Matić, Tamara
AU  - Ležaja Zebić, Maja
AU  - Miletić, Vesna
AU  - Trajković, Isaak
AU  - Milošević, Miloš
AU  - Račić, Aleksandar
AU  - Veljović, Djordje
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7573
AB  - This study aimed to (1) comparatively analyze properties of Sr- and Mg-substituted hydroxyapatite (HAP)-based dental inserts; (2) evaluate insert bonding to restorative materials, and (3) evaluate the effect of doped HAP inserts on fracture resistance (FR) of human molars with large occlusal restorations. By ion-doping with Sr or Mg, 3 insert types were obtained and characterized using XRD, SEM, Vickers hardness and fracture toughness. Shear bond strength (SBS) was determined between acid etched or unetched inserts and following materials: Maxcem cement (Kerr); Filtek Z250 (3M) bonded with Single Bond Universal (SBU; 3M) or Clearfil Universal (Cf; Kuraray). Modified Class I cavities were prepared in 16 intact molars and restored using insert + composite or composite only (control) (n = 8/group). FR of restored molars was determined by static load until fracture upon thermal cycling. Fracture toughness was similar between Sr/Mg-doped inserts (0.94–1.04 MPam−1/2 p = .429). Mg-doped inserts showed greater hardness (range 4.78–5.15 GPa) than Sr6 inserts (3.74 ± 0.31 GPa; p < .05). SBS for SBU and Cf adhesives (range 7.19–15.93 MPa) was higher than for Maxcem (range 3.07–5.95 MPa) (p < .05). There was no significant difference in FR between molars restored with insert-containing and control restorations (3.00 ± 0.30 kN and 3.22 ± 0.42 kN, respectively; p > .05). HAP-based inserts doped with Mg/Sr had different composition and mechanical properties. Adhesive bonding to inserts resulted in greater bond strength than cementation, which may be improved by insert acid-etching. Ion-doped HAP inserts did not affect FR of restored molars. In conclusion, HAP-based dental inserts may potentially replace dentin in large cavities, without affecting fracture resistance of restored teeth.
PB  - Wiley
T2  - Jurnal of biomedical materials research Part B: Applied Biomaterials
T1  - Hydroxyapatite-based dental inserts: Microstructure, mechanical properties, bonding efficiency and fracture resistance of molars with occlusal restorations
IS  - 1
VL  - 112
DO  - 10.1002/jbm.b.35331
ER  - 

@article{
author = "Matić, Tamara and Ležaja Zebić, Maja and Miletić, Vesna and Trajković, Isaak and Milošević, Miloš and Račić, Aleksandar and Veljović, Djordje",
year = "2023",
abstract = "This study aimed to (1) comparatively analyze properties of Sr- and Mg-substituted hydroxyapatite (HAP)-based dental inserts; (2) evaluate insert bonding to restorative materials, and (3) evaluate the effect of doped HAP inserts on fracture resistance (FR) of human molars with large occlusal restorations. By ion-doping with Sr or Mg, 3 insert types were obtained and characterized using XRD, SEM, Vickers hardness and fracture toughness. Shear bond strength (SBS) was determined between acid etched or unetched inserts and following materials: Maxcem cement (Kerr); Filtek Z250 (3M) bonded with Single Bond Universal (SBU; 3M) or Clearfil Universal (Cf; Kuraray). Modified Class I cavities were prepared in 16 intact molars and restored using insert + composite or composite only (control) (n = 8/group). FR of restored molars was determined by static load until fracture upon thermal cycling. Fracture toughness was similar between Sr/Mg-doped inserts (0.94–1.04 MPam−1/2 p = .429). Mg-doped inserts showed greater hardness (range 4.78–5.15 GPa) than Sr6 inserts (3.74 ± 0.31 GPa; p < .05). SBS for SBU and Cf adhesives (range 7.19–15.93 MPa) was higher than for Maxcem (range 3.07–5.95 MPa) (p < .05). There was no significant difference in FR between molars restored with insert-containing and control restorations (3.00 ± 0.30 kN and 3.22 ± 0.42 kN, respectively; p > .05). HAP-based inserts doped with Mg/Sr had different composition and mechanical properties. Adhesive bonding to inserts resulted in greater bond strength than cementation, which may be improved by insert acid-etching. Ion-doped HAP inserts did not affect FR of restored molars. In conclusion, HAP-based dental inserts may potentially replace dentin in large cavities, without affecting fracture resistance of restored teeth.",
publisher = "Wiley",
journal = "Jurnal of biomedical materials research Part B: Applied Biomaterials",
title = "Hydroxyapatite-based dental inserts: Microstructure, mechanical properties, bonding efficiency and fracture resistance of molars with occlusal restorations",
number = "1",
volume = "112",
doi = "10.1002/jbm.b.35331"
}

Matić, T., Ležaja Zebić, M., Miletić, V., Trajković, I., Milošević, M., Račić, A.,& Veljović, D.. (2023). Hydroxyapatite-based dental inserts: Microstructure, mechanical properties, bonding efficiency and fracture resistance of molars with occlusal restorations. in Jurnal of biomedical materials research Part B: Applied Biomaterials
Wiley., 112(1).
https://doi.org/10.1002/jbm.b.35331

Matić T, Ležaja Zebić M, Miletić V, Trajković I, Milošević M, Račić A, Veljović D. Hydroxyapatite-based dental inserts: Microstructure, mechanical properties, bonding efficiency and fracture resistance of molars with occlusal restorations. in Jurnal of biomedical materials research Part B: Applied Biomaterials. 2023;112(1).
doi:10.1002/jbm.b.35331 .

Matić, Tamara, Ležaja Zebić, Maja, Miletić, Vesna, Trajković, Isaak, Milošević, Miloš, Račić, Aleksandar, Veljović, Djordje, "Hydroxyapatite-based dental inserts: Microstructure, mechanical properties, bonding efficiency and fracture resistance of molars with occlusal restorations" in Jurnal of biomedical materials research Part B: Applied Biomaterials, 112, no. 1 (2023),
https://doi.org/10.1002/jbm.b.35331 . .

TY  - CONF
AU  - Jevtić, Ivana
AU  - Mladenović, Goran
AU  - Milošević, Miloš
AU  - Milovanović, Aleksa
AU  - Trajković, Isaak
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7012
AB  - SLS technology has become popular in various industries due to its ability to produce
complex components with less effort than traditional methods. The study used PA 12, a
commonly used material in SLS printing, to create three types of specimens that were tested
for their mechanical characteristics. The specimens were designed based on ISO standards
(i.e. ISO 178, ISO 527-2, ISO 604) and printed on the Fuse 1 (FormLabs, Summerville, MA)
3D printer in four batches. These batches differed according to the printing orientation (i.e.
horizontal and vertical) and the printing location (i.e. in the middle and on the edge of the
powder bed). The printed specimens were then tested on subjected to a standard tensile
testing machine (SHIMADZU AGS-X 100kN).
The study found that the specimens printed according to ISO 178 standard vertically in the
middle of the powder bed had the smallest deviations in mechanical characteristics. On the
other hand, the specimens printed based on ISO 604 standard had the biggest deviations.
These findings suggest that the printing orientation and location on the powder bed can affect
the mechanical properties of SLS-printed components
PB  - Serbian Ceramic Society
C3  - Serbian Ceramic Society Conference - ADVANCED CERAMICS AND APPLICATION XI
T1  - The influence of print orientation and print location on the mechanical characteristics of specimens obtained by SLS technology
EP  - 82
SP  - 82
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7012
ER  - 

@conference{
author = "Jevtić, Ivana and Mladenović, Goran and Milošević, Miloš and Milovanović, Aleksa and Trajković, Isaak",
year = "2023",
abstract = "SLS technology has become popular in various industries due to its ability to produce
complex components with less effort than traditional methods. The study used PA 12, a
commonly used material in SLS printing, to create three types of specimens that were tested
for their mechanical characteristics. The specimens were designed based on ISO standards
(i.e. ISO 178, ISO 527-2, ISO 604) and printed on the Fuse 1 (FormLabs, Summerville, MA)
3D printer in four batches. These batches differed according to the printing orientation (i.e.
horizontal and vertical) and the printing location (i.e. in the middle and on the edge of the
powder bed). The printed specimens were then tested on subjected to a standard tensile
testing machine (SHIMADZU AGS-X 100kN).
The study found that the specimens printed according to ISO 178 standard vertically in the
middle of the powder bed had the smallest deviations in mechanical characteristics. On the
other hand, the specimens printed based on ISO 604 standard had the biggest deviations.
These findings suggest that the printing orientation and location on the powder bed can affect
the mechanical properties of SLS-printed components",
publisher = "Serbian Ceramic Society",
journal = "Serbian Ceramic Society Conference - ADVANCED CERAMICS AND APPLICATION XI",
title = "The influence of print orientation and print location on the mechanical characteristics of specimens obtained by SLS technology",
pages = "82-82",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7012"
}

Jevtić, I., Mladenović, G., Milošević, M., Milovanović, A.,& Trajković, I.. (2023). The influence of print orientation and print location on the mechanical characteristics of specimens obtained by SLS technology. in Serbian Ceramic Society Conference - ADVANCED CERAMICS AND APPLICATION XI
Serbian Ceramic Society., 82-82.
https://hdl.handle.net/21.15107/rcub_machinery_7012

Jevtić I, Mladenović G, Milošević M, Milovanović A, Trajković I. The influence of print orientation and print location on the mechanical characteristics of specimens obtained by SLS technology. in Serbian Ceramic Society Conference - ADVANCED CERAMICS AND APPLICATION XI. 2023;:82-82.
https://hdl.handle.net/21.15107/rcub_machinery_7012 .

Jevtić, Ivana, Mladenović, Goran, Milošević, Miloš, Milovanović, Aleksa, Trajković, Isaak, "The influence of print orientation and print location on the mechanical characteristics of specimens obtained by SLS technology" in Serbian Ceramic Society Conference - ADVANCED CERAMICS AND APPLICATION XI (2023):82-82,
https://hdl.handle.net/21.15107/rcub_machinery_7012 .

TY  - CONF
AU  - Milošević, Miloš
AU  - Travica, Milan
AU  - Rakin, Marko
AU  - Sedmak, Aleksandar
AU  - Međo, Bojan
AU  - Trajković, Isaak
AU  - Milošević, Miloš
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7273
AB  - This paper presents the influence of geometry on the determination of the stress intensity factor KI on specimens produced by the selective laser sintering technique.The analysis of the determination of the stress intensity factor includes experimental and numerical tests. For this purpose, two geometries of specimens were used. Flat specimens with crack loaded in tension and ring specimens loaded on the inner wall. To understand the influence of geometry, specimens and their identical models were tested with three different ratios between the width of the test specimens and the initial length of the crack. Both types of specimens used for this experiment were made from polyamide PA12 utilizing the SLS (selective laser sintering) additive manufacturing process. The specimens are tested using the Shimadzu AGS-X 100 kN universal equipment for measuring mechanical characteristics of materials. The tensile testing is complemented by the GOM Aramis 2M system, which is utilized for digital image correlation and surface displacement tracking. For the numerical analyzes, we used the finite element method (Abaqus CAE software) to determine the KI factor based on the experimentally obtained results. The values of stress intensity factor for PA12 material show some different results for different types of specimens and effects of the type of production technique. We will present all the results and detail of examination in this paper.
PB  - Serbian Ceramic Society
C3  - Serbian Ceramic Society
T1  - Experimental and numerical determination of the fracture strength of PA12 material on specimens produced by selective laser sintering
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7273
ER  - 

@conference{
author = "Milošević, Miloš and Travica, Milan and Rakin, Marko and Sedmak, Aleksandar and Međo, Bojan and Trajković, Isaak and Milošević, Miloš",
year = "2023",
abstract = "This paper presents the influence of geometry on the determination of the stress intensity factor KI on specimens produced by the selective laser sintering technique.The analysis of the determination of the stress intensity factor includes experimental and numerical tests. For this purpose, two geometries of specimens were used. Flat specimens with crack loaded in tension and ring specimens loaded on the inner wall. To understand the influence of geometry, specimens and their identical models were tested with three different ratios between the width of the test specimens and the initial length of the crack. Both types of specimens used for this experiment were made from polyamide PA12 utilizing the SLS (selective laser sintering) additive manufacturing process. The specimens are tested using the Shimadzu AGS-X 100 kN universal equipment for measuring mechanical characteristics of materials. The tensile testing is complemented by the GOM Aramis 2M system, which is utilized for digital image correlation and surface displacement tracking. For the numerical analyzes, we used the finite element method (Abaqus CAE software) to determine the KI factor based on the experimentally obtained results. The values of stress intensity factor for PA12 material show some different results for different types of specimens and effects of the type of production technique. We will present all the results and detail of examination in this paper.",
publisher = "Serbian Ceramic Society",
journal = "Serbian Ceramic Society",
title = "Experimental and numerical determination of the fracture strength of PA12 material on specimens produced by selective laser sintering",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7273"
}

Milošević, M., Travica, M., Rakin, M., Sedmak, A., Međo, B., Trajković, I.,& Milošević, M.. (2023). Experimental and numerical determination of the fracture strength of PA12 material on specimens produced by selective laser sintering. in Serbian Ceramic Society
Serbian Ceramic Society..
https://hdl.handle.net/21.15107/rcub_machinery_7273

Milošević M, Travica M, Rakin M, Sedmak A, Međo B, Trajković I, Milošević M. Experimental and numerical determination of the fracture strength of PA12 material on specimens produced by selective laser sintering. in Serbian Ceramic Society. 2023;.
https://hdl.handle.net/21.15107/rcub_machinery_7273 .

Milošević, Miloš, Travica, Milan, Rakin, Marko, Sedmak, Aleksandar, Međo, Bojan, Trajković, Isaak, Milošević, Miloš, "Experimental and numerical determination of the fracture strength of PA12 material on specimens produced by selective laser sintering" in Serbian Ceramic Society (2023),
https://hdl.handle.net/21.15107/rcub_machinery_7273 .

TY  - CONF
AU  - Jevtić, Ivana
AU  - Mladenović, Goran
AU  - Milošević, Miloš
AU  - Trajković, Isaak
AU  - Milovanović, Aleksa
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6899
AB  - SLS technology is a popular choice in various industries worldwide because of its ability to produce complex geometry components with less effort when compared to conventional methods. The technology involves using materials in powder forms, such as polyamides (PA), polystyrenes, thermoplastic elastomers, and polyaryletherketones. In this study, the research focuses on compressive PA12 specimens with CAD model dimensions selected according to the ISO 604 standard, with bulk dimensions of Ø10x20 [mm]. The study utilizes a Fuse 1 (FormLabs, Summerville, MA) 3D printer that employs the SLS technology. This printer is capable of producing objects with different shapes and dimensions simultaneously, provided that they are printed at a minimum distance of 5 [mm] apart. The research involves producing four batches of specimens, each differing in printing orientation (i.e., horizontal and vertical) and printing location (i.e., printed on the edge and in the middle of the powder bed). The printed specimens are scanned, and the obtained scans are compared with the original CAD model in the GOM Inspect program. The highest deviations in all four specimen series are in height, ranging from 0.1 up to 0.15 mm. In the case of vertical specimens printed in the middle of the powder bed, there are also deviations in the width of the specimen.
PB  - University of Belgrade – Faculty of Mechanical Engineering
C3  - 7th International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2023, The Book Of Abstracts, Zlatibor, July 04- July 07, 2023
T1  - Deviations Measurements of SLS PA Material at Compressive Specimens
EP  - 8
SP  - 8
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6899
ER  - 

@conference{
author = "Jevtić, Ivana and Mladenović, Goran and Milošević, Miloš and Trajković, Isaak and Milovanović, Aleksa",
year = "2023",
abstract = "SLS technology is a popular choice in various industries worldwide because of its ability to produce complex geometry components with less effort when compared to conventional methods. The technology involves using materials in powder forms, such as polyamides (PA), polystyrenes, thermoplastic elastomers, and polyaryletherketones. In this study, the research focuses on compressive PA12 specimens with CAD model dimensions selected according to the ISO 604 standard, with bulk dimensions of Ø10x20 [mm]. The study utilizes a Fuse 1 (FormLabs, Summerville, MA) 3D printer that employs the SLS technology. This printer is capable of producing objects with different shapes and dimensions simultaneously, provided that they are printed at a minimum distance of 5 [mm] apart. The research involves producing four batches of specimens, each differing in printing orientation (i.e., horizontal and vertical) and printing location (i.e., printed on the edge and in the middle of the powder bed). The printed specimens are scanned, and the obtained scans are compared with the original CAD model in the GOM Inspect program. The highest deviations in all four specimen series are in height, ranging from 0.1 up to 0.15 mm. In the case of vertical specimens printed in the middle of the powder bed, there are also deviations in the width of the specimen.",
publisher = "University of Belgrade – Faculty of Mechanical Engineering",
journal = "7th International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2023, The Book Of Abstracts, Zlatibor, July 04- July 07, 2023",
title = "Deviations Measurements of SLS PA Material at Compressive Specimens",
pages = "8-8",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6899"
}

Jevtić, I., Mladenović, G., Milošević, M., Trajković, I.,& Milovanović, A.. (2023). Deviations Measurements of SLS PA Material at Compressive Specimens. in 7th International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2023, The Book Of Abstracts, Zlatibor, July 04- July 07, 2023
University of Belgrade – Faculty of Mechanical Engineering., 8-8.
https://hdl.handle.net/21.15107/rcub_machinery_6899

Jevtić I, Mladenović G, Milošević M, Trajković I, Milovanović A. Deviations Measurements of SLS PA Material at Compressive Specimens. in 7th International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2023, The Book Of Abstracts, Zlatibor, July 04- July 07, 2023. 2023;:8-8.
https://hdl.handle.net/21.15107/rcub_machinery_6899 .

Jevtić, Ivana, Mladenović, Goran, Milošević, Miloš, Trajković, Isaak, Milovanović, Aleksa, "Deviations Measurements of SLS PA Material at Compressive Specimens" in 7th International Conference of Experimental and Numerical Investigations and New Technologies – CNN TECH 2023, The Book Of Abstracts, Zlatibor, July 04- July 07, 2023 (2023):8-8,
https://hdl.handle.net/21.15107/rcub_machinery_6899 .

TY  - CONF
AU  - Travica, Milan
AU  - Mitrović, Nenad
AU  - Petrović, Aleksandar
AU  - Trajković, Isaak
AU  - Milošević, Miloš
AU  - Sedmak, Aleksandar
AU  - Berto, Filippo
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7698
AB  - For various pipe manufacturing methods, data on the pipe's strain and stress state in the circumferential direction is necessary (e.g. in the oil industry, the process of manufacturing seamless pipes with a conical shaft). The purpose of this research is to create a method for determining the strain and stress behaviour of Pipe Ring Tensile Specimens (PRTS) in the hoop direction. The absence of official methods for assessing a PRTS suggests that it could be developed. The implementation of the digital image correlation approach for evaluating plastic PRTS is discussed in this research. A specially constructed steel instrument with two D blocks is used to test PRTS. Two D-shaped mandrels are fixed on the tensile tool and tensile testing equipment, and a 3D printed PRTS is placed over them. The three-dimensional Digital Image Correlation (3D DIC) approach was used to capture the strain evolution in the gage length of the specimens. All specimens are 3D scanned to evaluate the geometry of the PRTS cross-section following fracture. Six groups of PRTS were studied, with three different filling percentages (60, 90, and 100 percent) and two different geometric kinds (Single and Double PRTS). The results reveal that the kind and percentage of filling, as well as the printing method, affect material behaviour; however, the methodology using a DIC system, 3D printer, and scanner is an excellent tool for mapping entire strain fields in PRTS and thereby defining pipe mechanical properties.
PB  - Innovation Center of Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2022
T1  - PIPE RING TENSILE SPECIMENS STRAIN MEASUREMENT
SP  - 11
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7698
ER  - 

@conference{
author = "Travica, Milan and Mitrović, Nenad and Petrović, Aleksandar and Trajković, Isaak and Milošević, Miloš and Sedmak, Aleksandar and Berto, Filippo",
year = "2022",
abstract = "For various pipe manufacturing methods, data on the pipe's strain and stress state in the circumferential direction is necessary (e.g. in the oil industry, the process of manufacturing seamless pipes with a conical shaft). The purpose of this research is to create a method for determining the strain and stress behaviour of Pipe Ring Tensile Specimens (PRTS) in the hoop direction. The absence of official methods for assessing a PRTS suggests that it could be developed. The implementation of the digital image correlation approach for evaluating plastic PRTS is discussed in this research. A specially constructed steel instrument with two D blocks is used to test PRTS. Two D-shaped mandrels are fixed on the tensile tool and tensile testing equipment, and a 3D printed PRTS is placed over them. The three-dimensional Digital Image Correlation (3D DIC) approach was used to capture the strain evolution in the gage length of the specimens. All specimens are 3D scanned to evaluate the geometry of the PRTS cross-section following fracture. Six groups of PRTS were studied, with three different filling percentages (60, 90, and 100 percent) and two different geometric kinds (Single and Double PRTS). The results reveal that the kind and percentage of filling, as well as the printing method, affect material behaviour; however, the methodology using a DIC system, 3D printer, and scanner is an excellent tool for mapping entire strain fields in PRTS and thereby defining pipe mechanical properties.",
publisher = "Innovation Center of Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2022",
title = "PIPE RING TENSILE SPECIMENS STRAIN MEASUREMENT",
pages = "11",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7698"
}

Travica, M., Mitrović, N., Petrović, A., Trajković, I., Milošević, M., Sedmak, A.,& Berto, F.. (2022). PIPE RING TENSILE SPECIMENS STRAIN MEASUREMENT. in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2022
Innovation Center of Faculty of Mechanical Engineering., 11.
https://hdl.handle.net/21.15107/rcub_machinery_7698

Travica M, Mitrović N, Petrović A, Trajković I, Milošević M, Sedmak A, Berto F. PIPE RING TENSILE SPECIMENS STRAIN MEASUREMENT. in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2022. 2022;:11.
https://hdl.handle.net/21.15107/rcub_machinery_7698 .

Travica, Milan, Mitrović, Nenad, Petrović, Aleksandar, Trajković, Isaak, Milošević, Miloš, Sedmak, Aleksandar, Berto, Filippo, "PIPE RING TENSILE SPECIMENS STRAIN MEASUREMENT" in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2022 (2022):11,
https://hdl.handle.net/21.15107/rcub_machinery_7698 .

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  - JOUR
AU  - Milošević, Miloš
AU  - Trajković, Isaak
AU  - Golubović, Zorana
AU  - Ivanov, Toni
AU  - Mladenović, Goran
AU  - Milovanović, Aleksa
AU  - Mitrović, Nenad
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5424
AB  - Martial arts and fight sports are mostly based on exchanging the punches and kicks that often result with injuries of face, skull bones, and neck vertebrae. One of possibilities to reduce number of injuries in athletes who deal with martial arts is development of new materials and improvement of designs for helmets used in sport fights. In order to experimentally analyze impact forces and simulate conditions during different fight punches mechanical installment was made. Aramis system is used to measure the displacement fields and the distribution of deformations which occur on the neck over the entire analyzed area based on the correlation of digital images. On this manner better understanding of behavior of both materials and structures during the action of the impact forces and loading is obtained. This information can further be used in researches related to the development of helmets used in martial arts which would influence reduction of values of neck deformations in athletes.
PB  - SAGE
T2  - Advances in Mechanical Engineering
T1  - Development of methodologies for experimental analysis of neck deformations caused by impact forces in martial arts
EP  - 14
EP  - M23
IS  - 8
SP  - 1
VL  - 14
DO  - 10.1177/16878132221121515
ER  - 

@article{
author = "Milošević, Miloš and Trajković, Isaak and Golubović, Zorana and Ivanov, Toni and Mladenović, Goran and Milovanović, Aleksa and Mitrović, Nenad",
year = "2022",
abstract = "Martial arts and fight sports are mostly based on exchanging the punches and kicks that often result with injuries of face, skull bones, and neck vertebrae. One of possibilities to reduce number of injuries in athletes who deal with martial arts is development of new materials and improvement of designs for helmets used in sport fights. In order to experimentally analyze impact forces and simulate conditions during different fight punches mechanical installment was made. Aramis system is used to measure the displacement fields and the distribution of deformations which occur on the neck over the entire analyzed area based on the correlation of digital images. On this manner better understanding of behavior of both materials and structures during the action of the impact forces and loading is obtained. This information can further be used in researches related to the development of helmets used in martial arts which would influence reduction of values of neck deformations in athletes.",
publisher = "SAGE",
journal = "Advances in Mechanical Engineering",
title = "Development of methodologies for experimental analysis of neck deformations caused by impact forces in martial arts",
pages = "14-M23-1",
number = "8",
volume = "14",
doi = "10.1177/16878132221121515"
}

Milošević, M., Trajković, I., Golubović, Z., Ivanov, T., Mladenović, G., Milovanović, A.,& Mitrović, N.. (2022). Development of methodologies for experimental analysis of neck deformations caused by impact forces in martial arts. in Advances in Mechanical Engineering
SAGE., 14(8), 1-14.
https://doi.org/10.1177/16878132221121515

Milošević M, Trajković I, Golubović Z, Ivanov T, Mladenović G, Milovanović A, Mitrović N. Development of methodologies for experimental analysis of neck deformations caused by impact forces in martial arts. in Advances in Mechanical Engineering. 2022;14(8):1-14.
doi:10.1177/16878132221121515 .

Milošević, Miloš, Trajković, Isaak, Golubović, Zorana, Ivanov, Toni, Mladenović, Goran, Milovanović, Aleksa, Mitrović, Nenad, "Development of methodologies for experimental analysis of neck deformations caused by impact forces in martial arts" in Advances in Mechanical Engineering, 14, no. 8 (2022):1-14,
https://doi.org/10.1177/16878132221121515 . .

TY  - CONF
AU  - Milošević, Miloš
AU  - Rakin, Marko
AU  - Berto, Filipo
AU  - Međo, Bojan
AU  - Trajković, Isaak
AU  - Bogojević, Nebojša
AU  - Ćirić-Kostić, Snežana
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7274
AB  - Plane-strain fracture toughness is one of the main parameters in linear elastic
fracture mechanics and its purpose is to show the material capability to withstand load while
having a defect. Main validity aspect for such an assessment is to provide a wide enough crack
front to enable plane-strain condition. Nonetheless, in FDM (Fused Deposition Modeling)
polymers, due to structural anisotropy caused by material properties and Additive
Manufacturing (AM) process parameters, more validity aspects must be met. During the planestrain fracture toughness test a crack must follow a straight line from initiation cite up to the
point of structural failure. For such a purpose a DIC (Digital Image Correlation) device can be
used for crack path direction analysis. Plane-strain fracture toughness assessment is conducted
according to the ASTM D5045-14 standard for testing of polymer materials. Tests are
performed on SENB (Single Edge Notched Bend) specimens, made from two similar polymer
materials: quasi-brittle PLA and ductile PLA-X composite. Specimens are manufactured with
four different AM process parameters, i.e., layer height, infill density, printing orientation and
one batch was dried before testing. Testing is conducted using 3-point bending test fixture on
universal testing machine, with DIC dual-camera device placed ahead of the machine in order
to capture full-field deformations of front SENB specimen surface (Fig. 1).
PB  - ESIS Publishing House (ESIS-PH) European Conference on Fracture
C3  - Procedia Structural Integrity
T1  - Additively manufactured tensile ring-shaped specimens for pipeline material fracture examination - influence of geometry
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7274
ER  - 

@conference{
author = "Milošević, Miloš and Rakin, Marko and Berto, Filipo and Međo, Bojan and Trajković, Isaak and Bogojević, Nebojša and Ćirić-Kostić, Snežana",
year = "2022",
abstract = "Plane-strain fracture toughness is one of the main parameters in linear elastic
fracture mechanics and its purpose is to show the material capability to withstand load while
having a defect. Main validity aspect for such an assessment is to provide a wide enough crack
front to enable plane-strain condition. Nonetheless, in FDM (Fused Deposition Modeling)
polymers, due to structural anisotropy caused by material properties and Additive
Manufacturing (AM) process parameters, more validity aspects must be met. During the planestrain fracture toughness test a crack must follow a straight line from initiation cite up to the
point of structural failure. For such a purpose a DIC (Digital Image Correlation) device can be
used for crack path direction analysis. Plane-strain fracture toughness assessment is conducted
according to the ASTM D5045-14 standard for testing of polymer materials. Tests are
performed on SENB (Single Edge Notched Bend) specimens, made from two similar polymer
materials: quasi-brittle PLA and ductile PLA-X composite. Specimens are manufactured with
four different AM process parameters, i.e., layer height, infill density, printing orientation and
one batch was dried before testing. Testing is conducted using 3-point bending test fixture on
universal testing machine, with DIC dual-camera device placed ahead of the machine in order
to capture full-field deformations of front SENB specimen surface (Fig. 1).",
publisher = "ESIS Publishing House (ESIS-PH) European Conference on Fracture",
journal = "Procedia Structural Integrity",
title = "Additively manufactured tensile ring-shaped specimens for pipeline material fracture examination - influence of geometry",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7274"
}

Milošević, M., Rakin, M., Berto, F., Međo, B., Trajković, I., Bogojević, N.,& Ćirić-Kostić, S.. (2022). Additively manufactured tensile ring-shaped specimens for pipeline material fracture examination - influence of geometry. in Procedia Structural Integrity
ESIS Publishing House (ESIS-PH) European Conference on Fracture..
https://hdl.handle.net/21.15107/rcub_machinery_7274

Milošević M, Rakin M, Berto F, Međo B, Trajković I, Bogojević N, Ćirić-Kostić S. Additively manufactured tensile ring-shaped specimens for pipeline material fracture examination - influence of geometry. in Procedia Structural Integrity. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_7274 .

Milošević, Miloš, Rakin, Marko, Berto, Filipo, Međo, Bojan, Trajković, Isaak, Bogojević, Nebojša, Ćirić-Kostić, Snežana, "Additively manufactured tensile ring-shaped specimens for pipeline material fracture examination - influence of geometry" in Procedia Structural Integrity (2022),
https://hdl.handle.net/21.15107/rcub_machinery_7274 .

TY  - CONF
AU  - Milovanović, Aleksa
AU  - Milošević, Miloš
AU  - Trajković, Isaak
AU  - Sedmak, Aleksandar
AU  - Razavi, Mohammad Javad
AU  - Berto, Filippo
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7197
AB  - Plane-strain fracture toughness is one of the main parameters in linear elastic fracture mechanics and its purpose is to show the material capability to withstand load while having a defect. Main validity aspect for such an assessment is to provide a wide enough crack front to enable plane-strain condition. Nonetheless, in FDM (Fused Deposition Modeling), due to structural anisotropy caused by polymer material properties and Additive Manufacturing (AM) process parameters, more validity aspects must be met. During the plane-strain fracture toughness test a crack must follow a straight line from initiation up to the point of structural failure. Plane-strain fracture toughness assessment is conducted according to the ASTM D5045-14 standard for testing of polymer materials. Tests are performed on SENB (Single Edge Notched Bend) specimens, made from two similar polymer materials: quasi-brittle PLA and ductile PLA-X composite. Specimens are manufactured with four different AM process parameters, i.e., layer height, infill density, printing orientation and one specimen batch was dried before testing.
PB  - Elsevier BV
C3  - Procedia Structural Integrity
T1  - Crack path direction in plane-strain fracture toughness assessment tests of quasi-brittle PLA polymer and ductile PLA-X composite
EP  - 1381
SP  - 1376
VL  - 42
DO  - 10.1016/j.prostr.2022.12.175
ER  - 

@conference{
author = "Milovanović, Aleksa and Milošević, Miloš and Trajković, Isaak and Sedmak, Aleksandar and Razavi, Mohammad Javad and Berto, Filippo",
year = "2022",
abstract = "Plane-strain fracture toughness is one of the main parameters in linear elastic fracture mechanics and its purpose is to show the material capability to withstand load while having a defect. Main validity aspect for such an assessment is to provide a wide enough crack front to enable plane-strain condition. Nonetheless, in FDM (Fused Deposition Modeling), due to structural anisotropy caused by polymer material properties and Additive Manufacturing (AM) process parameters, more validity aspects must be met. During the plane-strain fracture toughness test a crack must follow a straight line from initiation up to the point of structural failure. Plane-strain fracture toughness assessment is conducted according to the ASTM D5045-14 standard for testing of polymer materials. Tests are performed on SENB (Single Edge Notched Bend) specimens, made from two similar polymer materials: quasi-brittle PLA and ductile PLA-X composite. Specimens are manufactured with four different AM process parameters, i.e., layer height, infill density, printing orientation and one specimen batch was dried before testing.",
publisher = "Elsevier BV",
journal = "Procedia Structural Integrity",
title = "Crack path direction in plane-strain fracture toughness assessment tests of quasi-brittle PLA polymer and ductile PLA-X composite",
pages = "1381-1376",
volume = "42",
doi = "10.1016/j.prostr.2022.12.175"
}

Milovanović, A., Milošević, M., Trajković, I., Sedmak, A., Razavi, M. J.,& Berto, F.. (2022). Crack path direction in plane-strain fracture toughness assessment tests of quasi-brittle PLA polymer and ductile PLA-X composite. in Procedia Structural Integrity
Elsevier BV., 42, 1376-1381.
https://doi.org/10.1016/j.prostr.2022.12.175

Milovanović A, Milošević M, Trajković I, Sedmak A, Razavi MJ, Berto F. Crack path direction in plane-strain fracture toughness assessment tests of quasi-brittle PLA polymer and ductile PLA-X composite. in Procedia Structural Integrity. 2022;42:1376-1381.
doi:10.1016/j.prostr.2022.12.175 .

Milovanović, Aleksa, Milošević, Miloš, Trajković, Isaak, Sedmak, Aleksandar, Razavi, Mohammad Javad, Berto, Filippo, "Crack path direction in plane-strain fracture toughness assessment tests of quasi-brittle PLA polymer and ductile PLA-X composite" in Procedia Structural Integrity, 42 (2022):1376-1381,
https://doi.org/10.1016/j.prostr.2022.12.175 . .

TY  - CONF
AU  - Golubović, Zorana
AU  - Travica, Milan
AU  - Trajković, Isaak
AU  - Petrović, Aleksandar
AU  - Mišković, Žarko
AU  - Mitrović, Nenad
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7152
AB  - Fused deposition modelling is, among the other additive manufacturing processes, one of the 
most frequently used three-dimensional printing technologies, because of its ease of use, high speed in production and low cost of the final part. Printing processes and finished parts are often examined and characterized using various techniques, for gathering the mechanical, numerical, thermal, dimensional data, with goal to improve and optimize the outcome. The first part of this research is 
based on the following the temperature changes using thermal imaging camera during fused deposi-
tion modelling printing processes and during cooling process after printing is finished. Specimens 
were made from polylactic acid and polylactic acid - X improved with second-phase particles, in 
order to compare thermal and dimensional characteristics of both materials. Obtained results determined characteristic temperature behavior of materials. The second part of research employed optical 3D scanner for verification the stability and accuracy of printed specimens over time. Proposed period of measuring has shown that stabilization of parameters is taking place, and further follow-up should be done afterwards.
C3  - Proceedins of the 35th International Conference of Process Industry - Processing 2022
T1  - Investigation of Thermal and Dimensional Behavior of 3D Printed Materials Using Thermal Imaging and 3D Scanning
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7152
ER  - 

@conference{
author = "Golubović, Zorana and Travica, Milan and Trajković, Isaak and Petrović, Aleksandar and Mišković, Žarko and Mitrović, Nenad",
year = "2022",
abstract = "Fused deposition modelling is, among the other additive manufacturing processes, one of the 
most frequently used three-dimensional printing technologies, because of its ease of use, high speed in production and low cost of the final part. Printing processes and finished parts are often examined and characterized using various techniques, for gathering the mechanical, numerical, thermal, dimensional data, with goal to improve and optimize the outcome. The first part of this research is 
based on the following the temperature changes using thermal imaging camera during fused deposi-
tion modelling printing processes and during cooling process after printing is finished. Specimens 
were made from polylactic acid and polylactic acid - X improved with second-phase particles, in 
order to compare thermal and dimensional characteristics of both materials. Obtained results determined characteristic temperature behavior of materials. The second part of research employed optical 3D scanner for verification the stability and accuracy of printed specimens over time. Proposed period of measuring has shown that stabilization of parameters is taking place, and further follow-up should be done afterwards.",
journal = "Proceedins of the 35th International Conference of Process Industry - Processing 2022",
title = "Investigation of Thermal and Dimensional Behavior of 3D Printed Materials Using Thermal Imaging and 3D Scanning",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7152"
}

Golubović, Z., Travica, M., Trajković, I., Petrović, A., Mišković, Ž.,& Mitrović, N.. (2022). Investigation of Thermal and Dimensional Behavior of 3D Printed Materials Using Thermal Imaging and 3D Scanning. in Proceedins of the 35th International Conference of Process Industry - Processing 2022.
https://hdl.handle.net/21.15107/rcub_machinery_7152

Golubović Z, Travica M, Trajković I, Petrović A, Mišković Ž, Mitrović N. Investigation of Thermal and Dimensional Behavior of 3D Printed Materials Using Thermal Imaging and 3D Scanning. in Proceedins of the 35th International Conference of Process Industry - Processing 2022. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_7152 .

Golubović, Zorana, Travica, Milan, Trajković, Isaak, Petrović, Aleksandar, Mišković, Žarko, Mitrović, Nenad, "Investigation of Thermal and Dimensional Behavior of 3D Printed Materials Using Thermal Imaging and 3D Scanning" in Proceedins of the 35th International Conference of Process Industry - Processing 2022 (2022),
https://hdl.handle.net/21.15107/rcub_machinery_7152 .

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  - https://machinery.mas.bg.ac.rs/handle/123456789/6875
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.
Acknowledgement:
PB  - Serbian Ceramic Society
T1  - Laser sintered polyamide specimens - fabrication and tensile testing conditions on different geometries
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6875
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.
Acknowledgement:",
publisher = "Serbian Ceramic Society",
title = "Laser sintered polyamide specimens - fabrication and tensile testing conditions on different geometries",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6875"
}

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. 
Serbian Ceramic Society..
https://hdl.handle.net/21.15107/rcub_machinery_6875

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. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_6875 .

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" (2022),
https://hdl.handle.net/21.15107/rcub_machinery_6875 .