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  - 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  - CONF
AU  - Travica, Milan
AU  - Mitrović, Nenad
AU  - Petrović, Aleksandar
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7706
AB  - Different pipe manufacturing techniques, such as the manufacture of seamless pipes in the oil sector employing a conical shaft, necessitate data on the circumferential strain and stress condition of the pipe. The purpose of this study was to evaluating the displacement, strain, and stress behavior of a pipe ring tensile specimen (PRTS) in the hoop direction, as there was a lack of a standardized testing methodology. Five single S235JRH steel PRTS were tested for the study. The study describes how to test S235JRH steel PRTS with a Digital Image Correlation approach. The 3D Digital Image Correlation technique methodology was used to record the evolution of the strain. In the break zone and almost equivalent locations, all Single PRTS fractured. The experimental ultimate strength value's deviation value (also known as the real stress value) is greater than the theoretical ultimate strength value.
PB  - The Academy of Applied Technical Studies "Belgrade"
C3  - International Scientific and Professional Conference Politehnika 2023
T1  - STRAIN BEHAVIOR ANALYSIS OF STEEL S235JRH RING SPECIMENS
EP  - 1134
SP  - 1131
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7706
ER  - 

@conference{
author = "Travica, Milan and Mitrović, Nenad and Petrović, Aleksandar",
year = "2023",
abstract = "Different pipe manufacturing techniques, such as the manufacture of seamless pipes in the oil sector employing a conical shaft, necessitate data on the circumferential strain and stress condition of the pipe. The purpose of this study was to evaluating the displacement, strain, and stress behavior of a pipe ring tensile specimen (PRTS) in the hoop direction, as there was a lack of a standardized testing methodology. Five single S235JRH steel PRTS were tested for the study. The study describes how to test S235JRH steel PRTS with a Digital Image Correlation approach. The 3D Digital Image Correlation technique methodology was used to record the evolution of the strain. In the break zone and almost equivalent locations, all Single PRTS fractured. The experimental ultimate strength value's deviation value (also known as the real stress value) is greater than the theoretical ultimate strength value.",
publisher = "The Academy of Applied Technical Studies "Belgrade"",
journal = "International Scientific and Professional Conference Politehnika 2023",
title = "STRAIN BEHAVIOR ANALYSIS OF STEEL S235JRH RING SPECIMENS",
pages = "1134-1131",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7706"
}

Travica, M., Mitrović, N.,& Petrović, A.. (2023). STRAIN BEHAVIOR ANALYSIS OF STEEL S235JRH RING SPECIMENS. in International Scientific and Professional Conference Politehnika 2023
The Academy of Applied Technical Studies "Belgrade"., 1131-1134.
https://hdl.handle.net/21.15107/rcub_machinery_7706

Travica M, Mitrović N, Petrović A. STRAIN BEHAVIOR ANALYSIS OF STEEL S235JRH RING SPECIMENS. in International Scientific and Professional Conference Politehnika 2023. 2023;:1131-1134.
https://hdl.handle.net/21.15107/rcub_machinery_7706 .

Travica, Milan, Mitrović, Nenad, Petrović, Aleksandar, "STRAIN BEHAVIOR ANALYSIS OF STEEL S235JRH RING SPECIMENS" in International Scientific and Professional Conference Politehnika 2023 (2023):1131-1134,
https://hdl.handle.net/21.15107/rcub_machinery_7706 .

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  - Mitrović, Nenad
AU  - Mitrović, Aleksandra
AU  - Travica, Milan
PY  - 2023
UR  - http://divk.inovacionicentar.rs/ivk/ivk23/009-IVK1-2023-NM-AM-MT.pdf
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7148
AB  - Conventional tensile testing is most commonly used for determining the basic mechanical properties of the material. However, this approach is challenging for in-depth analysis of material behaviour, especially related to heterogeneous materials. The Digital Image Correlation (DIC) method is a contactless optical method that overcomes the constraints of traditional experimental methods (e.g., strain gauge) and allows for full-field displacement and strain measurement. The paper specifically covers 2D-DIC application on tensile testing thin flat specimens prepared using cotton textile with 130 g/m2 density. Results show significant differences in von Mises strain values over the surface of the specimen, ranging from 8 to 24 %. The application of 2D-DIC in this case shows the significance of full-field analysis, as conventional usage of the tensile test would have missed the difference in mechanical properties of adjacent areas on the same specimen. 2D-DIC provides high spatial resolution, accuracy, real-time data acquisition, and visualization, making it a valuable tool for characterizing mechanical properties of thin flat specimens and understanding deformation mechanisms.
T2  - Structural Integrity and Life
T1  - TENSILE TESTING OF FLAT THIN SPECIMENS USING THE TWO-DIMENSIONAL DIGITAL IMAGE CORRELATION METHOD
EP  - 13
SP  - 9
VL  - 23
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7148
ER  - 

@article{
author = "Mitrović, Nenad and Mitrović, Aleksandra and Travica, Milan",
year = "2023",
abstract = "Conventional tensile testing is most commonly used for determining the basic mechanical properties of the material. However, this approach is challenging for in-depth analysis of material behaviour, especially related to heterogeneous materials. The Digital Image Correlation (DIC) method is a contactless optical method that overcomes the constraints of traditional experimental methods (e.g., strain gauge) and allows for full-field displacement and strain measurement. The paper specifically covers 2D-DIC application on tensile testing thin flat specimens prepared using cotton textile with 130 g/m2 density. Results show significant differences in von Mises strain values over the surface of the specimen, ranging from 8 to 24 %. The application of 2D-DIC in this case shows the significance of full-field analysis, as conventional usage of the tensile test would have missed the difference in mechanical properties of adjacent areas on the same specimen. 2D-DIC provides high spatial resolution, accuracy, real-time data acquisition, and visualization, making it a valuable tool for characterizing mechanical properties of thin flat specimens and understanding deformation mechanisms.",
journal = "Structural Integrity and Life",
title = "TENSILE TESTING OF FLAT THIN SPECIMENS USING THE TWO-DIMENSIONAL DIGITAL IMAGE CORRELATION METHOD",
pages = "13-9",
volume = "23",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7148"
}

Mitrović, N., Mitrović, A.,& Travica, M.. (2023). TENSILE TESTING OF FLAT THIN SPECIMENS USING THE TWO-DIMENSIONAL DIGITAL IMAGE CORRELATION METHOD. in Structural Integrity and Life, 23, 9-13.
https://hdl.handle.net/21.15107/rcub_machinery_7148

Mitrović N, Mitrović A, Travica M. TENSILE TESTING OF FLAT THIN SPECIMENS USING THE TWO-DIMENSIONAL DIGITAL IMAGE CORRELATION METHOD. in Structural Integrity and Life. 2023;23:9-13.
https://hdl.handle.net/21.15107/rcub_machinery_7148 .

Mitrović, Nenad, Mitrović, Aleksandra, Travica, Milan, "TENSILE TESTING OF FLAT THIN SPECIMENS USING THE TWO-DIMENSIONAL DIGITAL IMAGE CORRELATION METHOD" in Structural Integrity and Life, 23 (2023):9-13,
https://hdl.handle.net/21.15107/rcub_machinery_7148 .

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  - 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  - 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  - Obradović, Katarina
AU  - Dragičević, Aleksandra
AU  - Travica, Milan
AU  - Miljković, Suzana
AU  - Mitrović, Nenad
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7699
AB  - Today, cosmetics have become an unavoidable feature of the modern way of life of individuals. The size of the global cosmetics market is estimated at 380.2 billion dollars in 2019 and is projected to reach 463.5 billion dollars by 2027, with a CAGR of 5.3% from 2021 to 2027. According to the client's request, a study of comparing three different cosmetic devices (ProLiftftr, MagicEye, MiniMeso) was conducted at the Centre for Optical Measurements of the Faculty of Mechanical Engineering, University of Belgrade. By using the images obtained with the PeakTech 5620 thermal imaging camera, the effects and quality of the device's effect on the skin were pointed out.
All three devices have cosmetic performance and after a certain number of treatments show improvement in the form of skin tightening, wrinkle reduction, and reduction of swelling around the eyes, but one stands out in terms of application and treatment on the skin. To be specific, the device Proliftfrf has the best properties, which after moving the probe from the place of skin treatment allows faster cooling and a more pleasant treatment without burning and overheating. In addition, it can be seen that the Proliftfrf cosmetic device compared to the other two MiniMeso and MagicEyes has software that is easier to use and allows quick access, and clearly defined items, which increases the speed of work in salons, and allows more customers. This device achieves
better treatment results in a shorter of therapy and thus increases the number of satisfied clients.
PB  - Innovation Center of Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2022
T1  - ANALYSIS OF THE INFLUENCE OF THREE DIFFERENT COSMETIC DEVICES ON SKIN SAMPLES USING A THERMOVISION CAMERA
SP  - 36
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7699
ER  - 

@conference{
author = "Obradović, Katarina and Dragičević, Aleksandra and Travica, Milan and Miljković, Suzana and Mitrović, Nenad",
year = "2022",
abstract = "Today, cosmetics have become an unavoidable feature of the modern way of life of individuals. The size of the global cosmetics market is estimated at 380.2 billion dollars in 2019 and is projected to reach 463.5 billion dollars by 2027, with a CAGR of 5.3% from 2021 to 2027. According to the client's request, a study of comparing three different cosmetic devices (ProLiftftr, MagicEye, MiniMeso) was conducted at the Centre for Optical Measurements of the Faculty of Mechanical Engineering, University of Belgrade. By using the images obtained with the PeakTech 5620 thermal imaging camera, the effects and quality of the device's effect on the skin were pointed out.
All three devices have cosmetic performance and after a certain number of treatments show improvement in the form of skin tightening, wrinkle reduction, and reduction of swelling around the eyes, but one stands out in terms of application and treatment on the skin. To be specific, the device Proliftfrf has the best properties, which after moving the probe from the place of skin treatment allows faster cooling and a more pleasant treatment without burning and overheating. In addition, it can be seen that the Proliftfrf cosmetic device compared to the other two MiniMeso and MagicEyes has software that is easier to use and allows quick access, and clearly defined items, which increases the speed of work in salons, and allows more customers. This device achieves
better treatment results in a shorter of therapy and thus increases the number of satisfied clients.",
publisher = "Innovation Center of Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2022",
title = "ANALYSIS OF THE INFLUENCE OF THREE DIFFERENT COSMETIC DEVICES ON SKIN SAMPLES USING A THERMOVISION CAMERA",
pages = "36",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7699"
}

Obradović, K., Dragičević, A., Travica, M., Miljković, S.,& Mitrović, N.. (2022). ANALYSIS OF THE INFLUENCE OF THREE DIFFERENT COSMETIC DEVICES ON SKIN SAMPLES USING A THERMOVISION CAMERA. in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2022
Innovation Center of Faculty of Mechanical Engineering., 36.
https://hdl.handle.net/21.15107/rcub_machinery_7699

Obradović K, Dragičević A, Travica M, Miljković S, Mitrović N. ANALYSIS OF THE INFLUENCE OF THREE DIFFERENT COSMETIC DEVICES ON SKIN SAMPLES USING A THERMOVISION CAMERA. in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2022. 2022;:36.
https://hdl.handle.net/21.15107/rcub_machinery_7699 .

Obradović, Katarina, Dragičević, Aleksandra, Travica, Milan, Miljković, Suzana, Mitrović, Nenad, "ANALYSIS OF THE INFLUENCE OF THREE DIFFERENT COSMETIC DEVICES ON SKIN SAMPLES USING A THERMOVISION CAMERA" in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2022 (2022):36,
https://hdl.handle.net/21.15107/rcub_machinery_7699 .

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

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

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

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

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

TY  - 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 .

TY  - CONF
AU  - Jevtić, Ivana
AU  - Mladenović, Goran
AU  - Milošević, Miloš
AU  - Milovanovic, Aleksa
AU  - Trajković, Isaak
AU  - Travica, Milan
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6931
AB  - The aim of this  paper  is to  determine the  mechanical  characteristics of parts  obtained  by Additive   Manufacturing    (AM). All  specimens  were   printed   on   a  Fuse   1 (FormLabs, Summerville, MA) 30 printer. This AM technology is SLS (Selective Laser Sintering). With this technology, objects of different shapes and dimensions can be produced at the same time. The only condition  is that during printing, the parts must be at least 5 [mm] apart from each other. The thickness ofthe powder layer during  printing was 110 microns. In this paper, one type of specimens  are  used  to  determine the  mechanical  characteristics, the  dimensions of which were  chosen  according  to  specific standard. This standard is ISO 178  for  3-point bending specimens. The dimensions of the  bending  specimens are  96x8x4  [mm]. These  specimens were produced in four batches, differing in printing  orientation (horizontal and vertical)  and printing  location  (printed on the edge and  in the  middle  of the  powder  bed). The material used for printing  the specimens is polyamide (PA 12). The flexural strength of this material  is
66  MPa. After  printing,     specimens   were  tested   on  a  standard  tensile  testing   machine
(SHIMADZU AGS-X 100kN).
In the case of vertical bending specimens  printed  in the middle, the flexural strength after the test  was 65.15  MPa, and for this type  of specimens  this is the smallest  deviation from the value given in the literature. The greatest deviations of the flexural  strength values  are for vertical  specimens    printed on  the  edge, where  the  flexural  strength is  58  MPa, and  for horizontal  specimens printed in the middle, the flexural strength is 81.7 MPa.
PB  - University of Belgrade – Faculty of Mechanical Engineering
C3  - 3rd International Workshop on Reliability and Design of Additively Manufactured Materials, The Book Of Abstracts, 4-6. October 2022, Belgrade, Serbia
T1  - Mechanical characteristics of parts obtained by sls printing technology
EP  - 51
SP  - 51
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6931
ER  - 

@conference{
author = "Jevtić, Ivana and Mladenović, Goran and Milošević, Miloš and Milovanovic, Aleksa and Trajković, Isaak and Travica, Milan",
year = "2022",
abstract = "The aim of this  paper  is to  determine the  mechanical  characteristics of parts  obtained  by Additive   Manufacturing    (AM). All  specimens  were   printed   on   a  Fuse   1 (FormLabs, Summerville, MA) 30 printer. This AM technology is SLS (Selective Laser Sintering). With this technology, objects of different shapes and dimensions can be produced at the same time. The only condition  is that during printing, the parts must be at least 5 [mm] apart from each other. The thickness ofthe powder layer during  printing was 110 microns. In this paper, one type of specimens  are  used  to  determine the  mechanical  characteristics, the  dimensions of which were  chosen  according  to  specific standard. This standard is ISO 178  for  3-point bending specimens. The dimensions of the  bending  specimens are  96x8x4  [mm]. These  specimens were produced in four batches, differing in printing  orientation (horizontal and vertical)  and printing  location  (printed on the edge and  in the  middle  of the  powder  bed). The material used for printing  the specimens is polyamide (PA 12). The flexural strength of this material  is
66  MPa. After  printing,     specimens   were  tested   on  a  standard  tensile  testing   machine
(SHIMADZU AGS-X 100kN).
In the case of vertical bending specimens  printed  in the middle, the flexural strength after the test  was 65.15  MPa, and for this type  of specimens  this is the smallest  deviation from the value given in the literature. The greatest deviations of the flexural  strength values  are for vertical  specimens    printed on  the  edge, where  the  flexural  strength is  58  MPa, and  for horizontal  specimens printed in the middle, the flexural strength is 81.7 MPa.",
publisher = "University of Belgrade – Faculty of Mechanical Engineering",
journal = "3rd International Workshop on Reliability and Design of Additively Manufactured Materials, The Book Of Abstracts, 4-6. October 2022, Belgrade, Serbia",
title = "Mechanical characteristics of parts obtained by sls printing technology",
pages = "51-51",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6931"
}

Jevtić, I., Mladenović, G., Milošević, M., Milovanovic, A., Trajković, I.,& Travica, M.. (2022). Mechanical characteristics of parts obtained by sls printing technology. in 3rd International Workshop on Reliability and Design of Additively Manufactured Materials, The Book Of Abstracts, 4-6. October 2022, Belgrade, Serbia
University of Belgrade – Faculty of Mechanical Engineering., 51-51.
https://hdl.handle.net/21.15107/rcub_machinery_6931

Jevtić I, Mladenović G, Milošević M, Milovanovic A, Trajković I, Travica M. Mechanical characteristics of parts obtained by sls printing technology. in 3rd International Workshop on Reliability and Design of Additively Manufactured Materials, The Book Of Abstracts, 4-6. October 2022, Belgrade, Serbia. 2022;:51-51.
https://hdl.handle.net/21.15107/rcub_machinery_6931 .

Jevtić, Ivana, Mladenović, Goran, Milošević, Miloš, Milovanovic, Aleksa, Trajković, Isaak, Travica, Milan, "Mechanical characteristics of parts obtained by sls printing technology" in 3rd International Workshop on Reliability and Design of Additively Manufactured Materials, The Book Of Abstracts, 4-6. October 2022, Belgrade, Serbia (2022):51-51,
https://hdl.handle.net/21.15107/rcub_machinery_6931 .

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/123456789/5929
AB  - This work presents the difference in the values of fracture mechanics parameters obtained by
testing of cylindrical specimens with a sharp notch, cut on the tip of a wider groove. The
samples were obtained using two different additive manufacturing techniques. The first type
of samples was obtained by the FDM (Fused Deposition Modeling) method, on the German
REPRAP X400 device with an average accuracy of 0.25 mm. The second type of samples was
made using the SLS (Selective Laser Sintering) method on the EOS Formiga P100 device with
a production precision of 0.08 mm. Regardless of the difference in manufacturing techniques,
the direction and orientation of the samples was identical. The samples were prepared so that
during loading the fibers are loaded in tension, i.e. axially. Different lengths of the sharp
notches were fabricated axially on the samples. The values of fracture mechanics parameters
such as CMOD (Crack Mouth Opening Displacement) and CTOD-5 (Crack Tip Opening
Displacement obtained using the -5 technique) were obtained using the digital image
correlation method. The obtained parameters, except for mutual correlation, were also used
for the verification of numerical results. In the future work, a procedure for determination of
energy-based fracture mechanics parameters will be developed for this sample geometry.
PB  - Faculty of Mechanical Engineering, Univ. of Belgrade
C3  - 3rd International Workshop on Reliability and Design of Additively Manufactured Materials – RdAMM2 Belgrade, Serbia, 4th –6th October 2022
T1  - Determining fracture mechanics parameters using the digital image correlation method on cylindrical samples produced by different additive manufacturing techniques
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5929
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 difference in the values of fracture mechanics parameters obtained by
testing of cylindrical specimens with a sharp notch, cut on the tip of a wider groove. The
samples were obtained using two different additive manufacturing techniques. The first type
of samples was obtained by the FDM (Fused Deposition Modeling) method, on the German
REPRAP X400 device with an average accuracy of 0.25 mm. The second type of samples was
made using the SLS (Selective Laser Sintering) method on the EOS Formiga P100 device with
a production precision of 0.08 mm. Regardless of the difference in manufacturing techniques,
the direction and orientation of the samples was identical. The samples were prepared so that
during loading the fibers are loaded in tension, i.e. axially. Different lengths of the sharp
notches were fabricated axially on the samples. The values of fracture mechanics parameters
such as CMOD (Crack Mouth Opening Displacement) and CTOD-5 (Crack Tip Opening
Displacement obtained using the -5 technique) were obtained using the digital image
correlation method. The obtained parameters, except for mutual correlation, were also used
for the verification of numerical results. In the future work, a procedure for determination of
energy-based fracture mechanics parameters will be developed for this sample geometry.",
publisher = "Faculty of Mechanical Engineering, Univ. of Belgrade",
journal = "3rd International Workshop on Reliability and Design of Additively Manufactured Materials – RdAMM2 Belgrade, Serbia, 4th –6th October 2022",
title = "Determining fracture mechanics parameters using the digital image correlation method on cylindrical samples produced by different additive manufacturing techniques",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5929"
}

Trajković, I., Milošević, M., Travica, M., Rakin, M., Jevtić, I., Sedmak, A.,& Međo, B.. (2022). Determining fracture mechanics parameters using the digital image correlation method on cylindrical samples produced by different additive manufacturing techniques. in 3rd International Workshop on Reliability and Design of Additively Manufactured Materials – RdAMM2 Belgrade, Serbia, 4th –6th October 2022
Faculty of Mechanical Engineering, Univ. of Belgrade..
https://hdl.handle.net/21.15107/rcub_machinery_5929

Trajković I, Milošević M, Travica M, Rakin M, Jevtić I, Sedmak A, Međo B. Determining fracture mechanics parameters using the digital image correlation method on cylindrical samples produced by different additive manufacturing techniques. in 3rd International Workshop on Reliability and Design of Additively Manufactured Materials – RdAMM2 Belgrade, Serbia, 4th –6th October 2022. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_5929 .

Trajković, Isaak, Milošević, Miloš, Travica, Milan, Rakin, Marko, Jevtić, Ivana, Sedmak, Aleksandar, Međo, Bojan, "Determining fracture mechanics parameters using the digital image correlation method on cylindrical samples produced by different additive manufacturing techniques" in 3rd International Workshop on Reliability and Design of Additively Manufactured Materials – RdAMM2 Belgrade, Serbia, 4th –6th October 2022 (2022),
https://hdl.handle.net/21.15107/rcub_machinery_5929 .

TY  - JOUR
AU  - Jelić, Aleksandra
AU  - Sekulić, Milica
AU  - Travica, Milan
AU  - Grzetić, Jelena
AU  - Ugrinović, Vukašin
AU  - Marinković, Aleksandar D.
AU  - Bozić, Aleksandra
AU  - Stamenović, Marina
AU  - Putić, Slaviša
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3775
AB  - In this study, silicate nanofillers; dicalcium silicate, magnesium silicate, tricalcium silicate, and wollastonite; were synthesized using four different methods and incorporated into the epoxy resin to improve its mechanical properties. Characterization of the newly synthesized nanofillers was performed using Fourier-transformation infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The purpose of this study was to analyze newly developed composite materials reinforced with silicate nanoparticles utilizing tensile testing and a full-field non-contact 3D Digital Image Correlation (DIC) method. Analysis of deformation and displacement fields gives precise material behavior during testing. Testing results allowed a more reliable assessment of the structural integrity of epoxy composite materials reinforced using different silicate nanofillers. It was concluded that the addition of 3% of dicalcium silicate, magnesium silicate, tricalcium silicate, and wollastonite lead to the increasement of tensile strength up to 31.5%, 29.0%, 27.5%, and 23.5% in comparison with neat epoxy, respectively. In order to offer more trustworthy information about the viscoelastic behavior of neat epoxy and composites, a dynamic mechanical analysis (DMA) was also performed and rheological measurements of uncured epoxy matrix and epoxy suspensions were obtained.
PB  - MDPI, Basel
T2  - Polymers
T1  - Determination of Mechanical Properties of Epoxy Composite Materials Reinforced with Silicate Nanofillers Using Digital Image Correlation (DIC)
IS  - 6
VL  - 14
DO  - 10.3390/polym14061255
ER  - 

@article{
author = "Jelić, Aleksandra and Sekulić, Milica and Travica, Milan and Grzetić, Jelena and Ugrinović, Vukašin and Marinković, Aleksandar D. and Bozić, Aleksandra and Stamenović, Marina and Putić, Slaviša",
year = "2022",
abstract = "In this study, silicate nanofillers; dicalcium silicate, magnesium silicate, tricalcium silicate, and wollastonite; were synthesized using four different methods and incorporated into the epoxy resin to improve its mechanical properties. Characterization of the newly synthesized nanofillers was performed using Fourier-transformation infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The purpose of this study was to analyze newly developed composite materials reinforced with silicate nanoparticles utilizing tensile testing and a full-field non-contact 3D Digital Image Correlation (DIC) method. Analysis of deformation and displacement fields gives precise material behavior during testing. Testing results allowed a more reliable assessment of the structural integrity of epoxy composite materials reinforced using different silicate nanofillers. It was concluded that the addition of 3% of dicalcium silicate, magnesium silicate, tricalcium silicate, and wollastonite lead to the increasement of tensile strength up to 31.5%, 29.0%, 27.5%, and 23.5% in comparison with neat epoxy, respectively. In order to offer more trustworthy information about the viscoelastic behavior of neat epoxy and composites, a dynamic mechanical analysis (DMA) was also performed and rheological measurements of uncured epoxy matrix and epoxy suspensions were obtained.",
publisher = "MDPI, Basel",
journal = "Polymers",
title = "Determination of Mechanical Properties of Epoxy Composite Materials Reinforced with Silicate Nanofillers Using Digital Image Correlation (DIC)",
number = "6",
volume = "14",
doi = "10.3390/polym14061255"
}

Jelić, A., Sekulić, M., Travica, M., Grzetić, J., Ugrinović, V., Marinković, A. D., Bozić, A., Stamenović, M.,& Putić, S.. (2022). Determination of Mechanical Properties of Epoxy Composite Materials Reinforced with Silicate Nanofillers Using Digital Image Correlation (DIC). in Polymers
MDPI, Basel., 14(6).
https://doi.org/10.3390/polym14061255

Jelić A, Sekulić M, Travica M, Grzetić J, Ugrinović V, Marinković AD, Bozić A, Stamenović M, Putić S. Determination of Mechanical Properties of Epoxy Composite Materials Reinforced with Silicate Nanofillers Using Digital Image Correlation (DIC). in Polymers. 2022;14(6).
doi:10.3390/polym14061255 .

Jelić, Aleksandra, Sekulić, Milica, Travica, Milan, Grzetić, Jelena, Ugrinović, Vukašin, Marinković, Aleksandar D., Bozić, Aleksandra, Stamenović, Marina, Putić, Slaviša, "Determination of Mechanical Properties of Epoxy Composite Materials Reinforced with Silicate Nanofillers Using Digital Image Correlation (DIC)" in Polymers, 14, no. 6 (2022),
https://doi.org/10.3390/polym14061255 . .

TY  - CONF
AU  - Golubović, Zorana
AU  - Mitrović, Aleksandra
AU  - Travica, Milan
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6312
AB  - Contact lenses have been used and manufactured for decades now, but recently 3D printing technologies were introduced as a new way of production. As a rapidly developing technology, 3D printing offers new possibilities for development and advantages in the manufacturing process of lenses, due to easy customization and geometry modelling. Standard production is not leaving much space for individual demands, concerning different ophthalmic diagnoses and unique patients’ eye characteristics. In this paper, the main emphasis is on the further development of the design and characteristics of lenses fabricated by this technology that can satisfactorily overcome the drawbacks of production approaches used until now. Areas of possible improvements are significant, meeting the individual demands of patients, customizing needed parameters for better therapy, biocompatibility, the possibility to integrate different optical sensors for diagnostics, even making the smart lenses, etc. There are a very limited number of studies dealing with 3D printing and examination of printed contact lenses, which leads to the conclusion that this is the research area of the future.
PB  - University of Belgrade, Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies "CNN TECH 2022" - Book of Abstracts
T1  - Possibilities in Production of 3D Printed Contact Lenses
EP  - 57
SP  - 57
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6312
ER  - 

@conference{
author = "Golubović, Zorana and Mitrović, Aleksandra and Travica, Milan",
year = "2022",
abstract = "Contact lenses have been used and manufactured for decades now, but recently 3D printing technologies were introduced as a new way of production. As a rapidly developing technology, 3D printing offers new possibilities for development and advantages in the manufacturing process of lenses, due to easy customization and geometry modelling. Standard production is not leaving much space for individual demands, concerning different ophthalmic diagnoses and unique patients’ eye characteristics. In this paper, the main emphasis is on the further development of the design and characteristics of lenses fabricated by this technology that can satisfactorily overcome the drawbacks of production approaches used until now. Areas of possible improvements are significant, meeting the individual demands of patients, customizing needed parameters for better therapy, biocompatibility, the possibility to integrate different optical sensors for diagnostics, even making the smart lenses, etc. There are a very limited number of studies dealing with 3D printing and examination of printed contact lenses, which leads to the conclusion that this is the research area of the future.",
publisher = "University of Belgrade, Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies "CNN TECH 2022" - Book of Abstracts",
title = "Possibilities in Production of 3D Printed Contact Lenses",
pages = "57-57",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6312"
}

Golubović, Z., Mitrović, A.,& Travica, M.. (2022). Possibilities in Production of 3D Printed Contact Lenses. in International Conference of Experimental and Numerical Investigations and New Technologies "CNN TECH 2022" - Book of Abstracts
University of Belgrade, Faculty of Mechanical Engineering., 57-57.
https://hdl.handle.net/21.15107/rcub_machinery_6312

Golubović Z, Mitrović A, Travica M. Possibilities in Production of 3D Printed Contact Lenses. in International Conference of Experimental and Numerical Investigations and New Technologies "CNN TECH 2022" - Book of Abstracts. 2022;:57-57.
https://hdl.handle.net/21.15107/rcub_machinery_6312 .

Golubović, Zorana, Mitrović, Aleksandra, Travica, Milan, "Possibilities in Production of 3D Printed Contact Lenses" in International Conference of Experimental and Numerical Investigations and New Technologies "CNN TECH 2022" - Book of Abstracts (2022):57-57,
https://hdl.handle.net/21.15107/rcub_machinery_6312 .

TY  - JOUR
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/123456789/4673
AB  - Data on the strain and stress status of the pipe in the circumferential direction are required for various pipe manufacturing procedures (e.g., in the oil business, the process of manufacturing seamless pipes with a conical shaft). The aim of this study is to develop a procedure to determine the strain and stress behavior of Pipe Ring Tensile Specimens (PRTSs) in the hoop direction, as there are a lack of official standardized methods for testing PRTS. This paper discusses the application of the Digital Image Correlation method for testing plastic PRTSs. PRTSs are tested using a specially designed steel tool with two D blocks. A 3D-printed PRTS is placed over two D-shaped mandrels, which are fixed on a tensile tool and tensile testing machine. The strain evolution in the gage length of the specimens is captured using the three-dimensional Digital Image Correlation (3D DIC) method. To check the geometry of the cross-section of the PRTS after fracture, all the specimens are 3D scanned. For the study, six groups of PRTS are analyzed, consisting of three filling percentages (60, 90, and 100%) and two geometry types (Single and Double PRTS). The results show that the type and percentage of filling, as well as the method of printing, affect the material behavior. However, the approach with the DIC system, 3D printer, and scanner shows that they are effective instruments for mapping complete strain fields in PRTS, and thus are effective in characterizing the mechanical properties of pipes.
PB  - MDPI
T2  - Metals
T1  - Experimental Evaluation of Hoop Stress–Strain State of 3D-Printed Pipe Ring Tensile Specimens
SP  - 1560
VL  - 12
DO  - 10.3390/ met12101560
ER  - 

@article{
author = "Travica, Milan and Mitrović, Nenad and Petrović, Aleksandar and Trajković, Isaak and Milošević, Miloš and Sedmak, Aleksandar and Berto, Filippo",
year = "2022",
abstract = "Data on the strain and stress status of the pipe in the circumferential direction are required for various pipe manufacturing procedures (e.g., in the oil business, the process of manufacturing seamless pipes with a conical shaft). The aim of this study is to develop a procedure to determine the strain and stress behavior of Pipe Ring Tensile Specimens (PRTSs) in the hoop direction, as there are a lack of official standardized methods for testing PRTS. This paper discusses the application of the Digital Image Correlation method for testing plastic PRTSs. PRTSs are tested using a specially designed steel tool with two D blocks. A 3D-printed PRTS is placed over two D-shaped mandrels, which are fixed on a tensile tool and tensile testing machine. The strain evolution in the gage length of the specimens is captured using the three-dimensional Digital Image Correlation (3D DIC) method. To check the geometry of the cross-section of the PRTS after fracture, all the specimens are 3D scanned. For the study, six groups of PRTS are analyzed, consisting of three filling percentages (60, 90, and 100%) and two geometry types (Single and Double PRTS). The results show that the type and percentage of filling, as well as the method of printing, affect the material behavior. However, the approach with the DIC system, 3D printer, and scanner shows that they are effective instruments for mapping complete strain fields in PRTS, and thus are effective in characterizing the mechanical properties of pipes.",
publisher = "MDPI",
journal = "Metals",
title = "Experimental Evaluation of Hoop Stress–Strain State of 3D-Printed Pipe Ring Tensile Specimens",
pages = "1560",
volume = "12",
doi = "10.3390/ met12101560"
}

Travica, M., Mitrović, N., Petrović, A., Trajković, I., Milošević, M., Sedmak, A.,& Berto, F.. (2022). Experimental Evaluation of Hoop Stress–Strain State of 3D-Printed Pipe Ring Tensile Specimens. in Metals
MDPI., 12, 1560.
https://doi.org/10.3390/ met12101560

Travica M, Mitrović N, Petrović A, Trajković I, Milošević M, Sedmak A, Berto F. Experimental Evaluation of Hoop Stress–Strain State of 3D-Printed Pipe Ring Tensile Specimens. in Metals. 2022;12:1560.
doi:10.3390/ met12101560 .

Travica, Milan, Mitrović, Nenad, Petrović, Aleksandar, Trajković, Isaak, Milošević, Miloš, Sedmak, Aleksandar, Berto, Filippo, "Experimental Evaluation of Hoop Stress–Strain State of 3D-Printed Pipe Ring Tensile Specimens" in Metals, 12 (2022):1560,
https://doi.org/10.3390/ met12101560 . .

TY  - CONF
AU  - Jevtić, Ivana
AU  - Mladenović, Goran
AU  - Milošević, Miloš
AU  - Milovanović, Aleksa
AU  - Trajković, Isaak
AU  - Travica, Milan
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5834
AB  - SLS technology is widely used in several industries worldwide mainly due to its ability to 
manufacture complex geometry components with less effort compared to conventional 
methods. Such technology uses materials in powder form, the most common ones are 
polyamides (PA), polystyrenes, thermoplastic elastomers, and polyaryletherketones. Research 
covers flexural PA12 specimens, with CAD model dimensions selected according to the ISO 
178 standard, with 96x8x4 [mm] in bulk. Printing was performed on Fuse 1 (FormLabs, 
Summerville, MA) machine with four batches, differing in printing orientation and printing 
location. Vertical and horizontal orientations are applied, and each orientation is combined 
with the printing location, i.e., in the middle and on the edge of the powder bed. Printed 
specimens are scanned and obtained scans are then compared with original CAD model in the 
GOM Inspect program. All four specimen batches have deviation maximum on lateral sides, 
where the surface is minimal. Nearly 0.42 mm deviations are present in horizontally printed 
specimens placed in the middle of the powder bed, and these values are maximal recorded 
deviations. Worth mentioning are vertical specimens printed in the middle, which show not 
only lateral deviations but posses 0.07 mm deviations on largest surface, i.e., on 96x8 mm 
one
PB  - Serbian Ceramic Society
C3  - The Tenth Serbian Ceramic Society Conference -Advanced Ceramics and Application
T1  - Deviation measurement of SLS PA material regarding location and  orientation of printing
EP  - 76
SP  - 76
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5834
ER  - 

@conference{
author = "Jevtić, Ivana and Mladenović, Goran and Milošević, Miloš and Milovanović, Aleksa and Trajković, Isaak and Travica, Milan",
year = "2022",
abstract = "SLS technology is widely used in several industries worldwide mainly due to its ability to 
manufacture complex geometry components with less effort compared to conventional 
methods. Such technology uses materials in powder form, the most common ones are 
polyamides (PA), polystyrenes, thermoplastic elastomers, and polyaryletherketones. Research 
covers flexural PA12 specimens, with CAD model dimensions selected according to the ISO 
178 standard, with 96x8x4 [mm] in bulk. Printing was performed on Fuse 1 (FormLabs, 
Summerville, MA) machine with four batches, differing in printing orientation and printing 
location. Vertical and horizontal orientations are applied, and each orientation is combined 
with the printing location, i.e., in the middle and on the edge of the powder bed. Printed 
specimens are scanned and obtained scans are then compared with original CAD model in the 
GOM Inspect program. All four specimen batches have deviation maximum on lateral sides, 
where the surface is minimal. Nearly 0.42 mm deviations are present in horizontally printed 
specimens placed in the middle of the powder bed, and these values are maximal recorded 
deviations. Worth mentioning are vertical specimens printed in the middle, which show not 
only lateral deviations but posses 0.07 mm deviations on largest surface, i.e., on 96x8 mm 
one",
publisher = "Serbian Ceramic Society",
journal = "The Tenth Serbian Ceramic Society Conference -Advanced Ceramics and Application",
title = "Deviation measurement of SLS PA material regarding location and  orientation of printing",
pages = "76-76",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5834"
}

Jevtić, I., Mladenović, G., Milošević, M., Milovanović, A., Trajković, I.,& Travica, M.. (2022). Deviation measurement of SLS PA material regarding location and  orientation of printing. in The Tenth Serbian Ceramic Society Conference -Advanced Ceramics and Application
Serbian Ceramic Society., 76-76.
https://hdl.handle.net/21.15107/rcub_machinery_5834

Jevtić I, Mladenović G, Milošević M, Milovanović A, Trajković I, Travica M. Deviation measurement of SLS PA material regarding location and  orientation of printing. in The Tenth Serbian Ceramic Society Conference -Advanced Ceramics and Application. 2022;:76-76.
https://hdl.handle.net/21.15107/rcub_machinery_5834 .

Jevtić, Ivana, Mladenović, Goran, Milošević, Miloš, Milovanović, Aleksa, Trajković, Isaak, Travica, Milan, "Deviation measurement of SLS PA material regarding location and  orientation of printing" in The Tenth Serbian Ceramic Society Conference -Advanced Ceramics and Application (2022):76-76,
https://hdl.handle.net/21.15107/rcub_machinery_5834 .

TY  - JOUR
AU  - Jevtić, Ivana
AU  - Mladenović, Goran
AU  - Milošević, Miloš
AU  - Milovanović, Aleksa
AU  - Trajković, Isaak
AU  - Travica, Milan
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5603
AB  - Dimensional accuracy estimation of additively manufactured parts obtained via Selective Laser Sintering (SLS) is examined. As benchmark models, tensile specimens according to ISO 527-2 standard and bending specimens according to ISO 178 are selected. For all additively manufactured specimens, dimensions are measured and compared with the original CAD models. Tensile specimens are 170x20x4 mm in bulk, and the specimens intended for 3-point bend tests are 96x8x4 mm in bulk. Both specimen configurations are additively manufactured in two different printing orientations, i.e. horizontal and vertical. All specimens are produced on the Fuse 1 device (FormLabs, Summerville, MA), using Polyamide 12 (PA 12) material. After fabrication and postprocessing, all specimens are scanned on Atos Core 200 3D scanner and afterward compared with the original CAD models via the GOM Inspect programme (GOM Metrology GmbH, Braunschweig, Germany).
T2  - Structural integrity and life
T1  - Dimensional accuracy of parts obtained by SLS technology
EP  - 292
IS  - 3
SP  - 288
VL  - 22
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5603
ER  - 

@article{
author = "Jevtić, Ivana and Mladenović, Goran and Milošević, Miloš and Milovanović, Aleksa and Trajković, Isaak and Travica, Milan",
year = "2022",
abstract = "Dimensional accuracy estimation of additively manufactured parts obtained via Selective Laser Sintering (SLS) is examined. As benchmark models, tensile specimens according to ISO 527-2 standard and bending specimens according to ISO 178 are selected. For all additively manufactured specimens, dimensions are measured and compared with the original CAD models. Tensile specimens are 170x20x4 mm in bulk, and the specimens intended for 3-point bend tests are 96x8x4 mm in bulk. Both specimen configurations are additively manufactured in two different printing orientations, i.e. horizontal and vertical. All specimens are produced on the Fuse 1 device (FormLabs, Summerville, MA), using Polyamide 12 (PA 12) material. After fabrication and postprocessing, all specimens are scanned on Atos Core 200 3D scanner and afterward compared with the original CAD models via the GOM Inspect programme (GOM Metrology GmbH, Braunschweig, Germany).",
journal = "Structural integrity and life",
title = "Dimensional accuracy of parts obtained by SLS technology",
pages = "292-288",
number = "3",
volume = "22",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5603"
}

Jevtić, I., Mladenović, G., Milošević, M., Milovanović, A., Trajković, I.,& Travica, M.. (2022). Dimensional accuracy of parts obtained by SLS technology. in Structural integrity and life, 22(3), 288-292.
https://hdl.handle.net/21.15107/rcub_machinery_5603

Jevtić I, Mladenović G, Milošević M, Milovanović A, Trajković I, Travica M. Dimensional accuracy of parts obtained by SLS technology. in Structural integrity and life. 2022;22(3):288-292.
https://hdl.handle.net/21.15107/rcub_machinery_5603 .

Jevtić, Ivana, Mladenović, Goran, Milošević, Miloš, Milovanović, Aleksa, Trajković, Isaak, Travica, Milan, "Dimensional accuracy of parts obtained by SLS technology" in Structural integrity and life, 22, no. 3 (2022):288-292,
https://hdl.handle.net/21.15107/rcub_machinery_5603 .

TY  - CONF
AU  - Jelić, A.
AU  - Travica, Milan
AU  - Ugrinović, Vukašin
AU  - Božić, A.
AU  - Stamenović, Marina
AU  - Brkić, D.
AU  - Putić, Slaviša
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3805
AB  - Due to its remarkable qualities, carbon fiber epoxy composite sandwich panels are used in a variety of engineering applications. The goal of this research is to use tensile testing and a full-field non-contact 3D Digital Image Correlation (DIC) method to characterize carbon fiber reinforced composite sandwich panels with varied fiber orientations (0°/90° and ± 45°). The tested materials were composed of carbon fiber prepregs with epoxy resin systems and Aramid synthetic fiber. The properties of the materials were determined using full-field data derived from 3D DIC measurements and a set of experiments by according to ASTM standards. Values of maximum stress and strain at entire areas, break stress and strain, and toughness at entire areas and, modulus of elasticity of both structures were compared. The adherend's full-field, out-of-plane deformation, strain distribution, and strain evolution along the bond line were captured using a digital image correlation method, allowing the fracture mechanism to be visually defined. Since DIC produces the displacement field, the strain field must be deduced from it. The orientation of the fibers had a significant impact on the tensile properties of the tested materials. The results revealed that the specimen with 0°/90° fiber orientation had higher break stress and brittle fracture, whereas the specimen with ± 45° fiber orientation twisted in the fiber direction had higher elongation values while carrying the applied load. In order to complement previously obtained results, scanning electron microscopy (SEM) analysis of the fibers and core, as well as fracture surfaces was performed.
PB  - Springer Science and Business Media Deutschland GmbH
C3  - Lecture Notes in Networks and Systems
T1  - Comparison of Tensile Properties of Carbon/Epoxy Composite Materials with Different Fiber Orientation Using Digital Image Correlation
EP  - 255
SP  - 239
VL  - 323
DO  - 10.1007/978-3-030-86009-7_13
ER  - 

@conference{
author = "Jelić, A. and Travica, Milan and Ugrinović, Vukašin and Božić, A. and Stamenović, Marina and Brkić, D. and Putić, Slaviša",
year = "2022",
abstract = "Due to its remarkable qualities, carbon fiber epoxy composite sandwich panels are used in a variety of engineering applications. The goal of this research is to use tensile testing and a full-field non-contact 3D Digital Image Correlation (DIC) method to characterize carbon fiber reinforced composite sandwich panels with varied fiber orientations (0°/90° and ± 45°). The tested materials were composed of carbon fiber prepregs with epoxy resin systems and Aramid synthetic fiber. The properties of the materials were determined using full-field data derived from 3D DIC measurements and a set of experiments by according to ASTM standards. Values of maximum stress and strain at entire areas, break stress and strain, and toughness at entire areas and, modulus of elasticity of both structures were compared. The adherend's full-field, out-of-plane deformation, strain distribution, and strain evolution along the bond line were captured using a digital image correlation method, allowing the fracture mechanism to be visually defined. Since DIC produces the displacement field, the strain field must be deduced from it. The orientation of the fibers had a significant impact on the tensile properties of the tested materials. The results revealed that the specimen with 0°/90° fiber orientation had higher break stress and brittle fracture, whereas the specimen with ± 45° fiber orientation twisted in the fiber direction had higher elongation values while carrying the applied load. In order to complement previously obtained results, scanning electron microscopy (SEM) analysis of the fibers and core, as well as fracture surfaces was performed.",
publisher = "Springer Science and Business Media Deutschland GmbH",
journal = "Lecture Notes in Networks and Systems",
title = "Comparison of Tensile Properties of Carbon/Epoxy Composite Materials with Different Fiber Orientation Using Digital Image Correlation",
pages = "255-239",
volume = "323",
doi = "10.1007/978-3-030-86009-7_13"
}

Jelić, A., Travica, M., Ugrinović, V., Božić, A., Stamenović, M., Brkić, D.,& Putić, S.. (2022). Comparison of Tensile Properties of Carbon/Epoxy Composite Materials with Different Fiber Orientation Using Digital Image Correlation. in Lecture Notes in Networks and Systems
Springer Science and Business Media Deutschland GmbH., 323, 239-255.
https://doi.org/10.1007/978-3-030-86009-7_13

Jelić A, Travica M, Ugrinović V, Božić A, Stamenović M, Brkić D, Putić S. Comparison of Tensile Properties of Carbon/Epoxy Composite Materials with Different Fiber Orientation Using Digital Image Correlation. in Lecture Notes in Networks and Systems. 2022;323:239-255.
doi:10.1007/978-3-030-86009-7_13 .

Jelić, A., Travica, Milan, Ugrinović, Vukašin, Božić, A., Stamenović, Marina, Brkić, D., Putić, Slaviša, "Comparison of Tensile Properties of Carbon/Epoxy Composite Materials with Different Fiber Orientation Using Digital Image Correlation" in Lecture Notes in Networks and Systems, 323 (2022):239-255,
https://doi.org/10.1007/978-3-030-86009-7_13 . .

TY  - CONF
AU  - Trajković, Isaak
AU  - Međo, Bojan
AU  - Milošević, Miloš
AU  - Travica, Milan
AU  - Mitrović, Nenad
AU  - Rakin, Marko
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7702
AB  - U ovom radu biće prikazan razvoj dizajna epruveta oblika prstena sa dve prsline kao i optimizacija parametara izrade. Epruvete su izrađene tehnikama aditivne proizvodnje tipa SLA (Stereolitography Apparatus) i FDM ( Fused Deposition Modeling). Odabrane tehnike omogućuju
veoma brz razvoj i izradu epruveta oblika prstena za zatezanje - PRNT (Pipe Ring Notched Tension). Epruvete izrađene navedenim tehnikama su ispitivane u okviru razvoja metode za ispitivanje PRNT epruveta i određivanja parametara mehanike loma kod uzoraka izrađenih od PLA premium filamenta firme German RepRap i fotopolimernog materijala tipa Photopolymer resin Gray ( FLGPGR04) firme FormLabs. Cilj ovog rada je optimizacija parametara 3D štampe u cilju dobijanja specijalno oblikovanih epruveta oblika prstena sa dve prsline za ispitivanje zatezanjem u obimnom pravcu. Ponovljivost procesa, mogućnost praćenja parametara mehanike loma: otvaranje usta prsline CMOD (Crack Mouth Opening Displacement), otvaranje vrha prsline CTOD (Crack Tip Opening Displacement) a kasnije i numerički proračun vrednosti J integrala, omogućila je izrada epruveta ovim tehnikama.
PB  - Akademija tehničkih strukovnih studija Beograd
C3  - Politehnika 2021
T1  - RAZVOJ DIZAJNA EPRUVETA OBLIKA PRSTENA SA DVE PRSLINE ZA ISPITIVANJE PARAMETARA MEHANIKE LOMA
EP  - 570
SP  - 565
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7702
ER  - 

@conference{
author = "Trajković, Isaak and Međo, Bojan and Milošević, Miloš and Travica, Milan and Mitrović, Nenad and Rakin, Marko",
year = "2021",
abstract = "U ovom radu biće prikazan razvoj dizajna epruveta oblika prstena sa dve prsline kao i optimizacija parametara izrade. Epruvete su izrađene tehnikama aditivne proizvodnje tipa SLA (Stereolitography Apparatus) i FDM ( Fused Deposition Modeling). Odabrane tehnike omogućuju
veoma brz razvoj i izradu epruveta oblika prstena za zatezanje - PRNT (Pipe Ring Notched Tension). Epruvete izrađene navedenim tehnikama su ispitivane u okviru razvoja metode za ispitivanje PRNT epruveta i određivanja parametara mehanike loma kod uzoraka izrađenih od PLA premium filamenta firme German RepRap i fotopolimernog materijala tipa Photopolymer resin Gray ( FLGPGR04) firme FormLabs. Cilj ovog rada je optimizacija parametara 3D štampe u cilju dobijanja specijalno oblikovanih epruveta oblika prstena sa dve prsline za ispitivanje zatezanjem u obimnom pravcu. Ponovljivost procesa, mogućnost praćenja parametara mehanike loma: otvaranje usta prsline CMOD (Crack Mouth Opening Displacement), otvaranje vrha prsline CTOD (Crack Tip Opening Displacement) a kasnije i numerički proračun vrednosti J integrala, omogućila je izrada epruveta ovim tehnikama.",
publisher = "Akademija tehničkih strukovnih studija Beograd",
journal = "Politehnika 2021",
title = "RAZVOJ DIZAJNA EPRUVETA OBLIKA PRSTENA SA DVE PRSLINE ZA ISPITIVANJE PARAMETARA MEHANIKE LOMA",
pages = "570-565",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7702"
}

Trajković, I., Međo, B., Milošević, M., Travica, M., Mitrović, N.,& Rakin, M.. (2021). RAZVOJ DIZAJNA EPRUVETA OBLIKA PRSTENA SA DVE PRSLINE ZA ISPITIVANJE PARAMETARA MEHANIKE LOMA. in Politehnika 2021
Akademija tehničkih strukovnih studija Beograd., 565-570.
https://hdl.handle.net/21.15107/rcub_machinery_7702

Trajković I, Međo B, Milošević M, Travica M, Mitrović N, Rakin M. RAZVOJ DIZAJNA EPRUVETA OBLIKA PRSTENA SA DVE PRSLINE ZA ISPITIVANJE PARAMETARA MEHANIKE LOMA. in Politehnika 2021. 2021;:565-570.
https://hdl.handle.net/21.15107/rcub_machinery_7702 .

Trajković, Isaak, Međo, Bojan, Milošević, Miloš, Travica, Milan, Mitrović, Nenad, Rakin, Marko, "RAZVOJ DIZAJNA EPRUVETA OBLIKA PRSTENA SA DVE PRSLINE ZA ISPITIVANJE PARAMETARA MEHANIKE LOMA" in Politehnika 2021 (2021):565-570,
https://hdl.handle.net/21.15107/rcub_machinery_7702 .

TY  - CONF
AU  - Travica, Milan
AU  - Mitrović, Nenad
AU  - Petrović, Aleksandar
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7703
AB  - Procedura ispitivanja epruveta oblika prstena dobijenih iz cevi nije standardizovana i potpuno definisana. Cilj ove studije je razvijanje procedure za određivanje polja pomeranja i deformacija kod epruveta oblika prstena. Predložena je geometrija epruvete sa jednostrukom konfiguracijom standardne epruvete. Za potrebe ove studije, epruvete se proizvode tehnologijom 3D štampe sa standardnim polilaktičnim polimerom (PLA). Jedan od glavnih elemenata eksperimentalne postavke za ispitivanje epruveta oblika prstena je specijalno razvijeni alat sa dva D bloka. Alat se
postavlja na kidalicu i prenosi opterećenje na unutrašnju površinu uzorka simulirajući unutrašnji
pritisak. Metoda korelacije digitalnih slika koristi se za analizu polja pomeranja i deformacija na
spoljašnjoj površini uzorka. Eksperimenti se izvode pri brzinama od 1 mm/min na kidalici Shimadzu
AGS-X. Rezultati ispitivanja pokazuju da su kod predloženih epruveta lomovi nastali u zonama
snimanja, tj. u definisanim suženjima i ukazuju na mogućnost daljeg poboljšanja postupka ispitivanja i geometrije epruveta.
PB  - Akademija tehničkih strukovnih studija Beograd
C3  - Politehnika 2021
T1  - EKSPERIMENTALNA POSTAVKA ZA ISPITIVANJE EPRUVETA OBLIKA PRSTENA
EP  - 576
SP  - 571
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7703
ER  - 

@conference{
author = "Travica, Milan and Mitrović, Nenad and Petrović, Aleksandar",
year = "2021",
abstract = "Procedura ispitivanja epruveta oblika prstena dobijenih iz cevi nije standardizovana i potpuno definisana. Cilj ove studije je razvijanje procedure za određivanje polja pomeranja i deformacija kod epruveta oblika prstena. Predložena je geometrija epruvete sa jednostrukom konfiguracijom standardne epruvete. Za potrebe ove studije, epruvete se proizvode tehnologijom 3D štampe sa standardnim polilaktičnim polimerom (PLA). Jedan od glavnih elemenata eksperimentalne postavke za ispitivanje epruveta oblika prstena je specijalno razvijeni alat sa dva D bloka. Alat se
postavlja na kidalicu i prenosi opterećenje na unutrašnju površinu uzorka simulirajući unutrašnji
pritisak. Metoda korelacije digitalnih slika koristi se za analizu polja pomeranja i deformacija na
spoljašnjoj površini uzorka. Eksperimenti se izvode pri brzinama od 1 mm/min na kidalici Shimadzu
AGS-X. Rezultati ispitivanja pokazuju da su kod predloženih epruveta lomovi nastali u zonama
snimanja, tj. u definisanim suženjima i ukazuju na mogućnost daljeg poboljšanja postupka ispitivanja i geometrije epruveta.",
publisher = "Akademija tehničkih strukovnih studija Beograd",
journal = "Politehnika 2021",
title = "EKSPERIMENTALNA POSTAVKA ZA ISPITIVANJE EPRUVETA OBLIKA PRSTENA",
pages = "576-571",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7703"
}

Travica, M., Mitrović, N.,& Petrović, A.. (2021). EKSPERIMENTALNA POSTAVKA ZA ISPITIVANJE EPRUVETA OBLIKA PRSTENA. in Politehnika 2021
Akademija tehničkih strukovnih studija Beograd., 571-576.
https://hdl.handle.net/21.15107/rcub_machinery_7703

Travica M, Mitrović N, Petrović A. EKSPERIMENTALNA POSTAVKA ZA ISPITIVANJE EPRUVETA OBLIKA PRSTENA. in Politehnika 2021. 2021;:571-576.
https://hdl.handle.net/21.15107/rcub_machinery_7703 .

Travica, Milan, Mitrović, Nenad, Petrović, Aleksandar, "EKSPERIMENTALNA POSTAVKA ZA ISPITIVANJE EPRUVETA OBLIKA PRSTENA" in Politehnika 2021 (2021):571-576,
https://hdl.handle.net/21.15107/rcub_machinery_7703 .

TY  - CONF
AU  - Golubović, Zorana
AU  - Travica, Milan
AU  - Mitrović, Aleksandra
AU  - Trajković, Isaak
AU  - Mitrović, Nenad
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7704
AB  - Poslednjih godina, razvoj 3D štampe je veoma značajan u domenu različitih proizvodnih tehnologija i industrije. Proizvodnja delova na ovaj način je vrlo fleksibilna, jer je na jednom uređaju
moguće napraviti više različitih modela, različite geometrije. Da bi proces 3D štampanja bio izveden na najprecizniji način, potrebno je pažljivo izabrati parametre štampe. U ovom radu prikazano je istraživanje promena temperaturnih polja korišćenjem termovizijske kamere nakon procesa 3D štampe polilaktičnog polimera (PLA), tehnologijom modelovanja istopljenog filamenta (FDM). Cilj rada je utvrđivanje i analiza promena temperatura koje se dešavaju u toku hlađenja uzorka nakon procesa 3D štampe i uticaja na promenu geometrije epruvete.
PB  - Akademija tehničkih strukovnih studija Beograd
C3  - Politehnika 2021
T1  - MOGUĆNOSTI PRAĆENJA TEMPERATURNOG POLJA NAKON PROCESA 3D ŠTAMPE
EP  - 582
SP  - 577
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7704
ER  - 

@conference{
author = "Golubović, Zorana and Travica, Milan and Mitrović, Aleksandra and Trajković, Isaak and Mitrović, Nenad",
year = "2021",
abstract = "Poslednjih godina, razvoj 3D štampe je veoma značajan u domenu različitih proizvodnih tehnologija i industrije. Proizvodnja delova na ovaj način je vrlo fleksibilna, jer je na jednom uređaju
moguće napraviti više različitih modela, različite geometrije. Da bi proces 3D štampanja bio izveden na najprecizniji način, potrebno je pažljivo izabrati parametre štampe. U ovom radu prikazano je istraživanje promena temperaturnih polja korišćenjem termovizijske kamere nakon procesa 3D štampe polilaktičnog polimera (PLA), tehnologijom modelovanja istopljenog filamenta (FDM). Cilj rada je utvrđivanje i analiza promena temperatura koje se dešavaju u toku hlađenja uzorka nakon procesa 3D štampe i uticaja na promenu geometrije epruvete.",
publisher = "Akademija tehničkih strukovnih studija Beograd",
journal = "Politehnika 2021",
title = "MOGUĆNOSTI PRAĆENJA TEMPERATURNOG POLJA NAKON PROCESA 3D ŠTAMPE",
pages = "582-577",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7704"
}

Golubović, Z., Travica, M., Mitrović, A., Trajković, I.,& Mitrović, N.. (2021). MOGUĆNOSTI PRAĆENJA TEMPERATURNOG POLJA NAKON PROCESA 3D ŠTAMPE. in Politehnika 2021
Akademija tehničkih strukovnih studija Beograd., 577-582.
https://hdl.handle.net/21.15107/rcub_machinery_7704

Golubović Z, Travica M, Mitrović A, Trajković I, Mitrović N. MOGUĆNOSTI PRAĆENJA TEMPERATURNOG POLJA NAKON PROCESA 3D ŠTAMPE. in Politehnika 2021. 2021;:577-582.
https://hdl.handle.net/21.15107/rcub_machinery_7704 .

Golubović, Zorana, Travica, Milan, Mitrović, Aleksandra, Trajković, Isaak, Mitrović, Nenad, "MOGUĆNOSTI PRAĆENJA TEMPERATURNOG POLJA NAKON PROCESA 3D ŠTAMPE" in Politehnika 2021 (2021):577-582,
https://hdl.handle.net/21.15107/rcub_machinery_7704 .