TY  - CONF
AU  - Mitrović, Aleksandra
AU  - Mitrović, Nenad
AU  - Kreculj, Dragan
AU  - Ratković Kovačević, Nada
AU  - Dihovicni, Djordje
AU  - Ilić, Ivana
PY  - 2024
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7742
AB  - Today, the waste material obtained by 3D printing operations presents significant challenges due to the increasing global adoption of this technology, leading to serious environmental implications. The generation of plastic waste from unsuccessful prints and end-of-life products is a growing concern, impacting the circular economy. With a 26% annual growth rate in additive manufacturing, the amount of waste is rapidly increasing, necessitating effective waste management strategies. However, 3D printing offers advantages in waste reduction compared to 
traditional manufacturing methods, with only 40% waste generation compared to subtractive technologies and much of the waste being recyclable. The challenges of waste material obtained by 3D printing are numerous and require a comprehensive approach to waste management and recycling. Moreover, leveraging the abundant opportunities for reusing materials and developing sustainable composite filaments, 3D printing can contribute to environmental sustainability and the principles of circular economy.
PB  - Conference of Academies for Applied Studies in Serbia (CAASS)
C3  - International Multidisciplinary Conference – Challenges of Contemporary Higher Education CCHE 2024
T1  - Challenges with Waste Material Obtained by 3D Printing
EP  - 421
SP  - 417
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7742
ER  - 

@conference{
author = "Mitrović, Aleksandra and Mitrović, Nenad and Kreculj, Dragan and Ratković Kovačević, Nada and Dihovicni, Djordje and Ilić, Ivana",
year = "2024",
abstract = "Today, the waste material obtained by 3D printing operations presents significant challenges due to the increasing global adoption of this technology, leading to serious environmental implications. The generation of plastic waste from unsuccessful prints and end-of-life products is a growing concern, impacting the circular economy. With a 26% annual growth rate in additive manufacturing, the amount of waste is rapidly increasing, necessitating effective waste management strategies. However, 3D printing offers advantages in waste reduction compared to 
traditional manufacturing methods, with only 40% waste generation compared to subtractive technologies and much of the waste being recyclable. The challenges of waste material obtained by 3D printing are numerous and require a comprehensive approach to waste management and recycling. Moreover, leveraging the abundant opportunities for reusing materials and developing sustainable composite filaments, 3D printing can contribute to environmental sustainability and the principles of circular economy.",
publisher = "Conference of Academies for Applied Studies in Serbia (CAASS)",
journal = "International Multidisciplinary Conference – Challenges of Contemporary Higher Education CCHE 2024",
title = "Challenges with Waste Material Obtained by 3D Printing",
pages = "421-417",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7742"
}

Mitrović, A., Mitrović, N., Kreculj, D., Ratković Kovačević, N., Dihovicni, D.,& Ilić, I.. (2024). Challenges with Waste Material Obtained by 3D Printing. in International Multidisciplinary Conference – Challenges of Contemporary Higher Education CCHE 2024
Conference of Academies for Applied Studies in Serbia (CAASS)., 417-421.
https://hdl.handle.net/21.15107/rcub_machinery_7742

Mitrović A, Mitrović N, Kreculj D, Ratković Kovačević N, Dihovicni D, Ilić I. Challenges with Waste Material Obtained by 3D Printing. in International Multidisciplinary Conference – Challenges of Contemporary Higher Education CCHE 2024. 2024;:417-421.
https://hdl.handle.net/21.15107/rcub_machinery_7742 .

Mitrović, Aleksandra, Mitrović, Nenad, Kreculj, Dragan, Ratković Kovačević, Nada, Dihovicni, Djordje, Ilić, Ivana, "Challenges with Waste Material Obtained by 3D Printing" in International Multidisciplinary Conference – Challenges of Contemporary Higher Education CCHE 2024 (2024):417-421,
https://hdl.handle.net/21.15107/rcub_machinery_7742 .

TY  - CONF
AU  - Mitrović, Aleksandra
AU  - Mitrović, Nenad
AU  - Kreculj, Dragan
AU  - Reljić, Mirjana
PY  - 2024
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7741
AB  - Eco-art and recycling initiatives often involve comprehensive community engagement and participation in specific conditions. This paper explores the synergy between eco-art and recycling processes, as an optimal strategy to advance environmental preservation, alongside the integration of land art with ecological concepts. As environmental concerns escalate, the integration of ecoartistic measures and practices with recycling initiatives emerges as a potential to enhance environmental consciousness and sustainability. The study delves into the interconnectedness of these two disciplines, examining how the creative expression of eco-art can amplify the impact of recycling efforts and activities, leading to heightened environmental awareness and conservation. By detailed examination of the intersections of these creative and ecological disciplines, the research aims to contribute insights into innovative approaches that simultaneously harmonize artistic expression and environmental conservation aspect, with the final important task of protecting our planet and ensuring sustainable development.
PB  - Conference of Academies for Applied Studies in Serbia (CAASS)
C3  - International Multidisciplinary Conference – Challenges of Contemporary Higher Education CCHE 2024
T1  - Merging Eco-Art and Recycling to Advance Environmental Preservation
EP  - 416
SP  - 412
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7741
ER  - 

@conference{
author = "Mitrović, Aleksandra and Mitrović, Nenad and Kreculj, Dragan and Reljić, Mirjana",
year = "2024",
abstract = "Eco-art and recycling initiatives often involve comprehensive community engagement and participation in specific conditions. This paper explores the synergy between eco-art and recycling processes, as an optimal strategy to advance environmental preservation, alongside the integration of land art with ecological concepts. As environmental concerns escalate, the integration of ecoartistic measures and practices with recycling initiatives emerges as a potential to enhance environmental consciousness and sustainability. The study delves into the interconnectedness of these two disciplines, examining how the creative expression of eco-art can amplify the impact of recycling efforts and activities, leading to heightened environmental awareness and conservation. By detailed examination of the intersections of these creative and ecological disciplines, the research aims to contribute insights into innovative approaches that simultaneously harmonize artistic expression and environmental conservation aspect, with the final important task of protecting our planet and ensuring sustainable development.",
publisher = "Conference of Academies for Applied Studies in Serbia (CAASS)",
journal = "International Multidisciplinary Conference – Challenges of Contemporary Higher Education CCHE 2024",
title = "Merging Eco-Art and Recycling to Advance Environmental Preservation",
pages = "416-412",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7741"
}

Mitrović, A., Mitrović, N., Kreculj, D.,& Reljić, M.. (2024). Merging Eco-Art and Recycling to Advance Environmental Preservation. in International Multidisciplinary Conference – Challenges of Contemporary Higher Education CCHE 2024
Conference of Academies for Applied Studies in Serbia (CAASS)., 412-416.
https://hdl.handle.net/21.15107/rcub_machinery_7741

Mitrović A, Mitrović N, Kreculj D, Reljić M. Merging Eco-Art and Recycling to Advance Environmental Preservation. in International Multidisciplinary Conference – Challenges of Contemporary Higher Education CCHE 2024. 2024;:412-416.
https://hdl.handle.net/21.15107/rcub_machinery_7741 .

Mitrović, Aleksandra, Mitrović, Nenad, Kreculj, Dragan, Reljić, Mirjana, "Merging Eco-Art and Recycling to Advance Environmental Preservation" in International Multidisciplinary Conference – Challenges of Contemporary Higher Education CCHE 2024 (2024):412-416,
https://hdl.handle.net/21.15107/rcub_machinery_7741 .

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 . .

Mitrović, N., Mladenović, G.,& Mitrović, A.. (2024). New Trends in Engineering Research: Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2023. 
Springer..
https://doi.org/10.1007/978-3-031-46432-4

Mitrović N, Mladenović G, Mitrović A. New Trends in Engineering Research: Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2023. 2024;.
doi:10.1007/978-3-031-46432-4 .

Mitrović, Nenad, Mladenović, Goran, Mitrović, Aleksandra, "New Trends in Engineering Research: Proceedings of the International Conference of Experimental and Numerical Investigations and New Technologies, CNNTech 2023" (2024),
https://doi.org/10.1007/978-3-031-46432-4 . .

TY  - CHAP
AU  - Mitrović, Nenad
AU  - Mitrović, Aleksandra
PY  - 2024
UR  - https://enauka.gov.rs/handle/123456789/896748
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7783
AB  - Energy efficiency plays a critical role in achieving economic, social, and environmental sustainability. This paper provides an overview of the current state of energy efficiency in Serbia, focusing on the challenges, opportunities, and potential pathways towards a more sustainable energy sector. The country has recognized the importance of energy efficiency in improving energy security, reducing costs, and complying with international environmental standards. However, Serbia faces significant challenges, including a lack of awareness of the benefits of energy efficiency, insufficient financing, and policy support for energy-efficient technologies. Nevertheless, Serbia possesses considerable potential for energy-efficient technologies and practices, particularly in the residential and industrial sectors. By promoting energy efficiency, Serbia can reduce energy costs, improve energy security, and contribute to global climate-change mitigation efforts. The paper also highlights the global challenges faced by the energy sector, such as rising energy demand, climate change, pollution reduction, and energy poverty, emphasizing the need for greening the energy sector and investing in renewable energy sources. The energy consumption trends, energy intensity, energy productivity, and share of renewable energy sources in Serbia were analyzed using EuroStat data. The paper concludes by emphasizing the importance of ambitious goals, public awareness, modernizing infrastructure, and securing adequate financing to drive energy efficiency improvements in Serbia. This overview serves as a valuable resource for policymakers, researchers, and stakeholders interested in promoting sustainable energy practices in Serbia and fostering a transition towards a more energy-efficient and environmentally friendly energy sector.
PB  - Springer
T2  - New Trends in Engineering Research
T1  - Energy Efficiency in Serbia: Challenges and Opportunities
EP  - 113
SP  - 105
VL  - 792
DO  - 10.1007/978-3-031-46432-4_9
ER  - 

@inbook{
author = "Mitrović, Nenad and Mitrović, Aleksandra",
year = "2024",
abstract = "Energy efficiency plays a critical role in achieving economic, social, and environmental sustainability. This paper provides an overview of the current state of energy efficiency in Serbia, focusing on the challenges, opportunities, and potential pathways towards a more sustainable energy sector. The country has recognized the importance of energy efficiency in improving energy security, reducing costs, and complying with international environmental standards. However, Serbia faces significant challenges, including a lack of awareness of the benefits of energy efficiency, insufficient financing, and policy support for energy-efficient technologies. Nevertheless, Serbia possesses considerable potential for energy-efficient technologies and practices, particularly in the residential and industrial sectors. By promoting energy efficiency, Serbia can reduce energy costs, improve energy security, and contribute to global climate-change mitigation efforts. The paper also highlights the global challenges faced by the energy sector, such as rising energy demand, climate change, pollution reduction, and energy poverty, emphasizing the need for greening the energy sector and investing in renewable energy sources. The energy consumption trends, energy intensity, energy productivity, and share of renewable energy sources in Serbia were analyzed using EuroStat data. The paper concludes by emphasizing the importance of ambitious goals, public awareness, modernizing infrastructure, and securing adequate financing to drive energy efficiency improvements in Serbia. This overview serves as a valuable resource for policymakers, researchers, and stakeholders interested in promoting sustainable energy practices in Serbia and fostering a transition towards a more energy-efficient and environmentally friendly energy sector.",
publisher = "Springer",
journal = "New Trends in Engineering Research",
booktitle = "Energy Efficiency in Serbia: Challenges and Opportunities",
pages = "113-105",
volume = "792",
doi = "10.1007/978-3-031-46432-4_9"
}

Mitrović, N.,& Mitrović, A.. (2024). Energy Efficiency in Serbia: Challenges and Opportunities. in New Trends in Engineering Research
Springer., 792, 105-113.
https://doi.org/10.1007/978-3-031-46432-4_9

Mitrović N, Mitrović A. Energy Efficiency in Serbia: Challenges and Opportunities. in New Trends in Engineering Research. 2024;792:105-113.
doi:10.1007/978-3-031-46432-4_9 .

Mitrović, Nenad, Mitrović, Aleksandra, "Energy Efficiency in Serbia: Challenges and Opportunities" in New Trends in Engineering Research, 792 (2024):105-113,
https://doi.org/10.1007/978-3-031-46432-4_9 . .

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

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

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

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

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

TY  - CONF
AU  - Golubović, Zorana
AU  - Mitrović, Aleksandra
AU  - Mitrović, Nenad
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4809
AB  - Three-dimensional printing is an innovative technique which is offering advantages in engineering in terms of modeling and processing, even shapes and geometries which are complex and are difficult to be manufactured with other methods. This novel digital technology provides advantages in production process of an individualized 3D object when compared to subtractive computer numeric controlled methods and conventional dentistry techniques. Applied digital workflow in dentistry embraces data acquisition with intraoral scanning, object design in CAD software and 3D printing with corresponding materials on adequate 3D printer. With the utilization of the 3D techniques, it is possible to make adequate digital models and to reproduce them with enough precision, which led to a transformation in dentistry practice and a wide range of present and possible future applications.
An important benefit regarding 3D printing in dental practice is the fact that various materials can be used, such as polymers, resins, metals, ceramics etc., even multiple different materials during one production process, if needed. On the other side, there is a handful of available AM techniques depending on the model geometry complexity and desired accuracy. Implementation of 3D technologies proved to be beneficial in laboratory and clinical settings, surgical and restorative
dentistry, and continues to expand in research and dental education. The aim of this article was to give one perspective and to review the techniques, materials and current applications of 3D printing in dentistry. As well, significance of waste and recycling of materials used for printing in this area is pointed out.
PB  - Springer Science and Business Media Deutschland GmbH
C3  - Lecture Notes in Networks and Systems
T1  - 3D Printing in Contemporary Dentistry
EP  - 232
SP  - 213
VL  - 564
DO  - 10.1007/978-3-031-19499-3_12
ER  - 

@conference{
author = "Golubović, Zorana and Mitrović, Aleksandra and Mitrović, Nenad",
year = "2023",
abstract = "Three-dimensional printing is an innovative technique which is offering advantages in engineering in terms of modeling and processing, even shapes and geometries which are complex and are difficult to be manufactured with other methods. This novel digital technology provides advantages in production process of an individualized 3D object when compared to subtractive computer numeric controlled methods and conventional dentistry techniques. Applied digital workflow in dentistry embraces data acquisition with intraoral scanning, object design in CAD software and 3D printing with corresponding materials on adequate 3D printer. With the utilization of the 3D techniques, it is possible to make adequate digital models and to reproduce them with enough precision, which led to a transformation in dentistry practice and a wide range of present and possible future applications.
An important benefit regarding 3D printing in dental practice is the fact that various materials can be used, such as polymers, resins, metals, ceramics etc., even multiple different materials during one production process, if needed. On the other side, there is a handful of available AM techniques depending on the model geometry complexity and desired accuracy. Implementation of 3D technologies proved to be beneficial in laboratory and clinical settings, surgical and restorative
dentistry, and continues to expand in research and dental education. The aim of this article was to give one perspective and to review the techniques, materials and current applications of 3D printing in dentistry. As well, significance of waste and recycling of materials used for printing in this area is pointed out.",
publisher = "Springer Science and Business Media Deutschland GmbH",
journal = "Lecture Notes in Networks and Systems",
title = "3D Printing in Contemporary Dentistry",
pages = "232-213",
volume = "564",
doi = "10.1007/978-3-031-19499-3_12"
}

Golubović, Z., Mitrović, A.,& Mitrović, N.. (2023). 3D Printing in Contemporary Dentistry. in Lecture Notes in Networks and Systems
Springer Science and Business Media Deutschland GmbH., 564, 213-232.
https://doi.org/10.1007/978-3-031-19499-3_12

Golubović Z, Mitrović A, Mitrović N. 3D Printing in Contemporary Dentistry. in Lecture Notes in Networks and Systems. 2023;564:213-232.
doi:10.1007/978-3-031-19499-3_12 .

Golubović, Zorana, Mitrović, Aleksandra, Mitrović, Nenad, "3D Printing in Contemporary Dentistry" in Lecture Notes in Networks and Systems, 564 (2023):213-232,
https://doi.org/10.1007/978-3-031-19499-3_12 . .

TY  - CONF
AU  - Peković, Ognjen
AU  - Aleksić, Ivan
AU  - Svorcan, Jelena
AU  - Volf, Goran
AU  - Matić, Dušan
AU  - Kirin, Snežana
AU  - Mitrović, Nenad
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7701
AB  - The pantograph’s purpose is to transfer electrical power from the overhead contact line to the train’s electric propulsion unit. To perform its function adequately, it is necessary to maintain the static contact force between the pantograph and the contact line within the values prescribed by appropriate standards for the entire extension range of the pantograph. The requirement to reach high contact lines complicates the kinematic scheme because the deviation of the trajectory of the pantograph’s collector head from vertical is also prescribed by standards. Further, the structural design of the pantograph is challenging because the greater slenderness ratio of the structure makes it difficult to meet the requirements in terms of stiffness and resistance to vibrations. While at low speeds aerodynamic forces are usually neglected, in high-speed pantographs, they have a significant impact and it is necessary to compensate for them. An aggravating circumstance is the
requirement that the pantograph should work in both knuckle-downstream and knuckle-upstream directions. This paper aims to present the development of a high-speed high–reach pantograph that is developed through the cooperation of company Minel General Electric and the University of Belgrade – Faculty of Mechanical Engineering as well as to present innovative designs of 
 gravitational and aerodynamical compensations that enabled the satisfaction of requested requirements in terms of geometric and static performance.
PB  - University of Belgrade - Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2023
T1  - DEVELOPMENT OF HIGH-REACH PANTOGRAPHS FOR HIGH-SPEED RAILWAYS
SP  - 97
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7701
ER  - 

@conference{
author = "Peković, Ognjen and Aleksić, Ivan and Svorcan, Jelena and Volf, Goran and Matić, Dušan and Kirin, Snežana and Mitrović, Nenad",
year = "2023",
abstract = "The pantograph’s purpose is to transfer electrical power from the overhead contact line to the train’s electric propulsion unit. To perform its function adequately, it is necessary to maintain the static contact force between the pantograph and the contact line within the values prescribed by appropriate standards for the entire extension range of the pantograph. The requirement to reach high contact lines complicates the kinematic scheme because the deviation of the trajectory of the pantograph’s collector head from vertical is also prescribed by standards. Further, the structural design of the pantograph is challenging because the greater slenderness ratio of the structure makes it difficult to meet the requirements in terms of stiffness and resistance to vibrations. While at low speeds aerodynamic forces are usually neglected, in high-speed pantographs, they have a significant impact and it is necessary to compensate for them. An aggravating circumstance is the
requirement that the pantograph should work in both knuckle-downstream and knuckle-upstream directions. This paper aims to present the development of a high-speed high–reach pantograph that is developed through the cooperation of company Minel General Electric and the University of Belgrade – Faculty of Mechanical Engineering as well as to present innovative designs of 
 gravitational and aerodynamical compensations that enabled the satisfaction of requested requirements in terms of geometric and static performance.",
publisher = "University of Belgrade - Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2023",
title = "DEVELOPMENT OF HIGH-REACH PANTOGRAPHS FOR HIGH-SPEED RAILWAYS",
pages = "97",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7701"
}

Peković, O., Aleksić, I., Svorcan, J., Volf, G., Matić, D., Kirin, S.,& Mitrović, N.. (2023). DEVELOPMENT OF HIGH-REACH PANTOGRAPHS FOR HIGH-SPEED RAILWAYS. in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2023
University of Belgrade - Faculty of Mechanical Engineering., 97.
https://hdl.handle.net/21.15107/rcub_machinery_7701

Peković O, Aleksić I, Svorcan J, Volf G, Matić D, Kirin S, Mitrović N. DEVELOPMENT OF HIGH-REACH PANTOGRAPHS FOR HIGH-SPEED RAILWAYS. in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2023. 2023;:97.
https://hdl.handle.net/21.15107/rcub_machinery_7701 .

Peković, Ognjen, Aleksić, Ivan, Svorcan, Jelena, Volf, Goran, Matić, Dušan, Kirin, Snežana, Mitrović, Nenad, "DEVELOPMENT OF HIGH-REACH PANTOGRAPHS FOR HIGH-SPEED RAILWAYS" in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2023 (2023):97,
https://hdl.handle.net/21.15107/rcub_machinery_7701 .

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

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

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

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

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

TY  - CONF
AU  - 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  - JOUR
AU  - Golubović, Zorana
AU  - Danilov, Ivan
AU  - Bojović, Božica
AU  - Petrov, Ljubiša
AU  - Sedmak, Aleksandar
AU  - Mišković, Žarko
AU  - Mitrović, Nenad
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7077
AB  - Additive manufacturing technologies have developed rapidly in recent decades, pushing
the limits of known manufacturing processes. The need to study the properties of the different
materials used for these processes comprehensively and in detail has become a primary goal in order
to get the best out of the manufacturing itself. The widely used thermoplastic polymer material
acrylonitrile butadiene styrene (ABS) was selected in the form of both filaments and ABS-like resins
to investigate and compare the mechanical properties through a series of different tests. ABS-like
resin material is commercially available, but it is not a sufficiently mechanically studied form of
the material, which leads to the rather limited literature. Considering that ABS resin is a declared
material that behaves like the ABS filament but in a different form, the objective of this study was to
compare these two commercially available materials printed with three different 3D printers, namely
Fused Deposition Modelling (FDM), Stereolithography (SLA) and Digital Light Processing (DLP). A
total of 45 test specimens with geometries and test protocols conforming to the relevant standards
were subjected to a series of tensile, three-point bending and compression tests to determine their
mechanical properties. Characterization also included evaluation of morphology with 2D and 3D
microscopy, dimensional accuracy of 3D scans, and Shore A hardness of each material and 3D printing
process. Tensile testing results have shown that FDM toughness is 40% of the value for DLP. FDM
elongation at break is 37% of DLP, while ultimate tensile stress for SLA is 27% higher than FDM value.
Elastic modulus for FDM and SLA coincide. Flexure testing results indicate that value of DLP flexural
modulus is 54% of the FDM value. SLA strain value is 59% of FDM, and DLP ultimate flexure stress
is 77% of the value for FDM. Compression test results imply that FDM specimens absorb at least
twice as much energy as vat polymerized specimens. Strain at break for SLA is 72% and strain at
ultimate stress is 60% of FDM values. FDM yield stress is 32% higher than DLP value. SLA ultimate
compressive stress is half of FDM, while value for DLP compressive modulus is 69% of the FDM
value. The results obtained are beneficial and give a more comprehensive picture of the behavior of
the ABS polymers used in different forms and different AM processes
PB  - MDPI
T2  - Polymers
T1  - A Comprehensive Mechanical Examination of ABS and ABS-like Polymers Additively Manufactured by Material Extrusion and Vat Photopolymerization Processes
IS  - 21
SP  - 4197
VL  - 15
DO  - 10.3390/polym15214197
ER  - 

@article{
author = "Golubović, Zorana and Danilov, Ivan and Bojović, Božica and Petrov, Ljubiša and Sedmak, Aleksandar and Mišković, Žarko and Mitrović, Nenad",
year = "2023",
abstract = "Additive manufacturing technologies have developed rapidly in recent decades, pushing
the limits of known manufacturing processes. The need to study the properties of the different
materials used for these processes comprehensively and in detail has become a primary goal in order
to get the best out of the manufacturing itself. The widely used thermoplastic polymer material
acrylonitrile butadiene styrene (ABS) was selected in the form of both filaments and ABS-like resins
to investigate and compare the mechanical properties through a series of different tests. ABS-like
resin material is commercially available, but it is not a sufficiently mechanically studied form of
the material, which leads to the rather limited literature. Considering that ABS resin is a declared
material that behaves like the ABS filament but in a different form, the objective of this study was to
compare these two commercially available materials printed with three different 3D printers, namely
Fused Deposition Modelling (FDM), Stereolithography (SLA) and Digital Light Processing (DLP). A
total of 45 test specimens with geometries and test protocols conforming to the relevant standards
were subjected to a series of tensile, three-point bending and compression tests to determine their
mechanical properties. Characterization also included evaluation of morphology with 2D and 3D
microscopy, dimensional accuracy of 3D scans, and Shore A hardness of each material and 3D printing
process. Tensile testing results have shown that FDM toughness is 40% of the value for DLP. FDM
elongation at break is 37% of DLP, while ultimate tensile stress for SLA is 27% higher than FDM value.
Elastic modulus for FDM and SLA coincide. Flexure testing results indicate that value of DLP flexural
modulus is 54% of the FDM value. SLA strain value is 59% of FDM, and DLP ultimate flexure stress
is 77% of the value for FDM. Compression test results imply that FDM specimens absorb at least
twice as much energy as vat polymerized specimens. Strain at break for SLA is 72% and strain at
ultimate stress is 60% of FDM values. FDM yield stress is 32% higher than DLP value. SLA ultimate
compressive stress is half of FDM, while value for DLP compressive modulus is 69% of the FDM
value. The results obtained are beneficial and give a more comprehensive picture of the behavior of
the ABS polymers used in different forms and different AM processes",
publisher = "MDPI",
journal = "Polymers",
title = "A Comprehensive Mechanical Examination of ABS and ABS-like Polymers Additively Manufactured by Material Extrusion and Vat Photopolymerization Processes",
number = "21",
pages = "4197",
volume = "15",
doi = "10.3390/polym15214197"
}

Golubović, Z., Danilov, I., Bojović, B., Petrov, L., Sedmak, A., Mišković, Ž.,& Mitrović, N.. (2023). A Comprehensive Mechanical Examination of ABS and ABS-like Polymers Additively Manufactured by Material Extrusion and Vat Photopolymerization Processes. in Polymers
MDPI., 15(21), 4197.
https://doi.org/10.3390/polym15214197

Golubović Z, Danilov I, Bojović B, Petrov L, Sedmak A, Mišković Ž, Mitrović N. A Comprehensive Mechanical Examination of ABS and ABS-like Polymers Additively Manufactured by Material Extrusion and Vat Photopolymerization Processes. in Polymers. 2023;15(21):4197.
doi:10.3390/polym15214197 .

Golubović, Zorana, Danilov, Ivan, Bojović, Božica, Petrov, Ljubiša, Sedmak, Aleksandar, Mišković, Žarko, Mitrović, Nenad, "A Comprehensive Mechanical Examination of ABS and ABS-like Polymers Additively Manufactured by Material Extrusion and Vat Photopolymerization Processes" in Polymers, 15, no. 21 (2023):4197,
https://doi.org/10.3390/polym15214197 . .

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

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

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

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

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

TY  - CONF
AU  - 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  - 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  - GEN
AU  - Jaćimović, Branislav M.
AU  - Genić, Srbislav
AU  - Stamenić, Mirjana
AU  - Aranđelović, Ivan
AU  - Petrović, Aleksandar
AU  - Mitrović, Nenad
AU  - Milovančević, Uroš
AU  - Ivošević, Miloš
AU  - Otović, Milena
AU  - Petrović, Andrija
AU  - Rajić, Radenko S.
AU  - Tanasić, Nikola
AU  - Mihailović, Miloš
AU  - Marković, Saša
AU  - Bogdanović, Predrag
AU  - Simonović, Tomislav
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6065
PB  - Univerzitet u Beogradu, Mašinski fakultet
T1  - Metodi i primeri eksperimentalnog rada u procesnom inženjerstvu i termotehnici
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6065
ER  - 

@misc{
author = "Jaćimović, Branislav M. and Genić, Srbislav and Stamenić, Mirjana and Aranđelović, Ivan and Petrović, Aleksandar and Mitrović, Nenad and Milovančević, Uroš and Ivošević, Miloš and Otović, Milena and Petrović, Andrija and Rajić, Radenko S. and Tanasić, Nikola and Mihailović, Miloš and Marković, Saša and Bogdanović, Predrag and Simonović, Tomislav",
year = "2022",
publisher = "Univerzitet u Beogradu, Mašinski fakultet",
title = "Metodi i primeri eksperimentalnog rada u procesnom inženjerstvu i termotehnici",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6065"
}

Jaćimović, B. M., Genić, S., Stamenić, M., Aranđelović, I., Petrović, A., Mitrović, N., Milovančević, U., Ivošević, M., Otović, M., Petrović, A., Rajić, R. S., Tanasić, N., Mihailović, M., Marković, S., Bogdanović, P.,& Simonović, T.. (2022). Metodi i primeri eksperimentalnog rada u procesnom inženjerstvu i termotehnici. 
Univerzitet u Beogradu, Mašinski fakultet..
https://hdl.handle.net/21.15107/rcub_machinery_6065

Jaćimović BM, Genić S, Stamenić M, Aranđelović I, Petrović A, Mitrović N, Milovančević U, Ivošević M, Otović M, Petrović A, Rajić RS, Tanasić N, Mihailović M, Marković S, Bogdanović P, Simonović T. Metodi i primeri eksperimentalnog rada u procesnom inženjerstvu i termotehnici. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_6065 .

Jaćimović, Branislav M., Genić, Srbislav, Stamenić, Mirjana, Aranđelović, Ivan, Petrović, Aleksandar, Mitrović, Nenad, Milovančević, Uroš, Ivošević, Miloš, Otović, Milena, Petrović, Andrija, Rajić, Radenko S., Tanasić, Nikola, Mihailović, Miloš, Marković, Saša, Bogdanović, Predrag, Simonović, Tomislav, "Metodi i primeri eksperimentalnog rada u procesnom inženjerstvu i termotehnici" (2022),
https://hdl.handle.net/21.15107/rcub_machinery_6065 .

TY  - JOUR
AU  - Rajić, Milena
AU  - Zivković, Dragoljub
AU  - Banić, Milan
AU  - Mančić, Marko
AU  - Maneski, Taško
AU  - Milošević, Miloš
AU  - Mitrović, Nenad
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3746
AB  - Boilers are one of the most used units for both heat generation plants and industry systems. Their operation is subjected to different working loads and maintenance requirements. Exploitation experience points out critical boiler zones where failures and break downs typically occur. This paper analyzes critical zones in hot water fire-tube boiler. Experimental procedure was performed on the model of this type of boilers and its critical element. The tube plate of hot water boiler was identified as the most critical one. Experimental analysis and numerical model verification were performed using Aramis system based on 3-D digital image correlation method. Numerical analysis was done in ANSYS software package and verification of results was done based on measurements obtained by strain gauges and local measurements performed by the Aramis system. Stress-strain analysis indicates the critical zones of boiler tube plate. The character of change parameters such as strain and stress occurring in the critical zones can be verified both by experimental and numerical data. The paper presents a novel approach in experimental and numerical analyses that can be conducted in similar units and used for existing unit optimization, as well as for new product testing on different loads and provide opportunity for further development and improvement for practical industrial application.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Experimental and numerical stress and strain analysis of the boiler reversing chamber tube plate
EP  - 2145
IS  - 3
SP  - 2135
VL  - 26
DO  - 10.2298/TSCI210313207R
ER  - 

@article{
author = "Rajić, Milena and Zivković, Dragoljub and Banić, Milan and Mančić, Marko and Maneski, Taško and Milošević, Miloš and Mitrović, Nenad",
year = "2022",
abstract = "Boilers are one of the most used units for both heat generation plants and industry systems. Their operation is subjected to different working loads and maintenance requirements. Exploitation experience points out critical boiler zones where failures and break downs typically occur. This paper analyzes critical zones in hot water fire-tube boiler. Experimental procedure was performed on the model of this type of boilers and its critical element. The tube plate of hot water boiler was identified as the most critical one. Experimental analysis and numerical model verification were performed using Aramis system based on 3-D digital image correlation method. Numerical analysis was done in ANSYS software package and verification of results was done based on measurements obtained by strain gauges and local measurements performed by the Aramis system. Stress-strain analysis indicates the critical zones of boiler tube plate. The character of change parameters such as strain and stress occurring in the critical zones can be verified both by experimental and numerical data. The paper presents a novel approach in experimental and numerical analyses that can be conducted in similar units and used for existing unit optimization, as well as for new product testing on different loads and provide opportunity for further development and improvement for practical industrial application.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Experimental and numerical stress and strain analysis of the boiler reversing chamber tube plate",
pages = "2145-2135",
number = "3",
volume = "26",
doi = "10.2298/TSCI210313207R"
}

Rajić, M., Zivković, D., Banić, M., Mančić, M., Maneski, T., Milošević, M.,& Mitrović, N.. (2022). Experimental and numerical stress and strain analysis of the boiler reversing chamber tube plate. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 26(3), 2135-2145.
https://doi.org/10.2298/TSCI210313207R

Rajić M, Zivković D, Banić M, Mančić M, Maneski T, Milošević M, Mitrović N. Experimental and numerical stress and strain analysis of the boiler reversing chamber tube plate. in Thermal Science. 2022;26(3):2135-2145.
doi:10.2298/TSCI210313207R .

Rajić, Milena, Zivković, Dragoljub, Banić, Milan, Mančić, Marko, Maneski, Taško, Milošević, Miloš, Mitrović, Nenad, "Experimental and numerical stress and strain analysis of the boiler reversing chamber tube plate" in Thermal Science, 26, no. 3 (2022):2135-2145,
https://doi.org/10.2298/TSCI210313207R . .

TY  - JOUR
AU  - Marinković, Mladen
AU  - Popović, Marina
AU  - Stojanović-Rundić, Suzana
AU  - Nikolić, Miloš
AU  - Cavić, Milena
AU  - Gavrilović, Dusica
AU  - Teodorović, Dušan
AU  - Mitrović, Nenad
AU  - Mijatovic Teodorović, Ljiljana
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3767
AB  - After primary treatment of localized prostate carcinoma (PC), up to a third of patients have disease recurrence. Different predictive models have already been used either for initial stratification of PC patients or to predict disease recurrence. Recently, artificial intelligence has been introduced in the diagnosis and management of PC with a potential to revolutionize this field. The aim of this study was to analyze machine learning (ML) classifiers in order to predict disease progression in the moment of prostate-specific antigen (PSA) elevation during follow-up. The study cohort consisted of 109 PC patients treated with external beam radiotherapy alone or in combination with androgen deprivation therapy. We developed and evaluated the performance of two ML algorithms based on artificial neural networks (ANN) and naive Bayes (NB). Of all patients, 72.5% was randomly selected for a training set while the remaining patients were used for testing of the models. The presence/absence of disease progression was defined as the output variable. The input variables for models were conducted from the univariate analysis preformed among two groups of patients in the training set. They included two pretreatment variables (UICC stage and Gleason's score risk group) and five posttreatment variables (nadir PSA, time to nadir PSA, PSA doubling time, PSA velocity, and PSA in the moment of disease reevaluation). The area under the receiver operating characteristic curve, sensitivity, specificity, positive predictive value, negative predictive value, and predictive accuracy was calculated to test the models' performance. The results showed that specificity was similar for both models, while NB achieved better sensitivity then ANN (100.0% versus 94.4%). The ANN showed an accuracy of 93.3%, and the matching for NB model was 96.7%. In this study, ML classifiers have shown potential for application in routine clinical practice during follow-up when disease progression was suspected.
PB  - Hindawi Ltd, London
T2  - Biomed Research International
T1  - Comparison of Different Machine Learning Models in Prediction of Postirradiation Recurrence in Prostate Carcinoma Patients
VL  - 2022
DO  - 10.1155/2022/7943609
ER  - 

@article{
author = "Marinković, Mladen and Popović, Marina and Stojanović-Rundić, Suzana and Nikolić, Miloš and Cavić, Milena and Gavrilović, Dusica and Teodorović, Dušan and Mitrović, Nenad and Mijatovic Teodorović, Ljiljana",
year = "2022",
abstract = "After primary treatment of localized prostate carcinoma (PC), up to a third of patients have disease recurrence. Different predictive models have already been used either for initial stratification of PC patients or to predict disease recurrence. Recently, artificial intelligence has been introduced in the diagnosis and management of PC with a potential to revolutionize this field. The aim of this study was to analyze machine learning (ML) classifiers in order to predict disease progression in the moment of prostate-specific antigen (PSA) elevation during follow-up. The study cohort consisted of 109 PC patients treated with external beam radiotherapy alone or in combination with androgen deprivation therapy. We developed and evaluated the performance of two ML algorithms based on artificial neural networks (ANN) and naive Bayes (NB). Of all patients, 72.5% was randomly selected for a training set while the remaining patients were used for testing of the models. The presence/absence of disease progression was defined as the output variable. The input variables for models were conducted from the univariate analysis preformed among two groups of patients in the training set. They included two pretreatment variables (UICC stage and Gleason's score risk group) and five posttreatment variables (nadir PSA, time to nadir PSA, PSA doubling time, PSA velocity, and PSA in the moment of disease reevaluation). The area under the receiver operating characteristic curve, sensitivity, specificity, positive predictive value, negative predictive value, and predictive accuracy was calculated to test the models' performance. The results showed that specificity was similar for both models, while NB achieved better sensitivity then ANN (100.0% versus 94.4%). The ANN showed an accuracy of 93.3%, and the matching for NB model was 96.7%. In this study, ML classifiers have shown potential for application in routine clinical practice during follow-up when disease progression was suspected.",
publisher = "Hindawi Ltd, London",
journal = "Biomed Research International",
title = "Comparison of Different Machine Learning Models in Prediction of Postirradiation Recurrence in Prostate Carcinoma Patients",
volume = "2022",
doi = "10.1155/2022/7943609"
}

Marinković, M., Popović, M., Stojanović-Rundić, S., Nikolić, M., Cavić, M., Gavrilović, D., Teodorović, D., Mitrović, N.,& Mijatovic Teodorović, L.. (2022). Comparison of Different Machine Learning Models in Prediction of Postirradiation Recurrence in Prostate Carcinoma Patients. in Biomed Research International
Hindawi Ltd, London., 2022.
https://doi.org/10.1155/2022/7943609

Marinković M, Popović M, Stojanović-Rundić S, Nikolić M, Cavić M, Gavrilović D, Teodorović D, Mitrović N, Mijatovic Teodorović L. Comparison of Different Machine Learning Models in Prediction of Postirradiation Recurrence in Prostate Carcinoma Patients. in Biomed Research International. 2022;2022.
doi:10.1155/2022/7943609 .

Marinković, Mladen, Popović, Marina, Stojanović-Rundić, Suzana, Nikolić, Miloš, Cavić, Milena, Gavrilović, Dusica, Teodorović, Dušan, Mitrović, Nenad, Mijatovic Teodorović, Ljiljana, "Comparison of Different Machine Learning Models in Prediction of Postirradiation Recurrence in Prostate Carcinoma Patients" in Biomed Research International, 2022 (2022),
https://doi.org/10.1155/2022/7943609 . .

TY  - CONF
AU  - Rajić, Milena
AU  - Živković, Dragoljub
AU  - Banić, Milan
AU  - Mančić, Marko
AU  - Mitrović, Nenad
AU  - Milošević, Miloš
PY  - 2021-07
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7697
AB  - The aim of the paper is to investigate the transient regime of hot water boiler numerically and experimentally. In the regime of starting up, as the most critical one, measurements were done on the boiler critical element. The operating characteristics as well as safe and reliable operation conditions of hot water boilers are limited by thermal stresses that occur in their structure. The greatest thermal stresses occur in transient operating regimes such as starting-up, changing operation mode or sudden shutdown, resulting in uneven heating or cooling of boiler elements. Large temperature gradients cause high thermal stresses that are especially critical
in elements with thick walls. As thermal stresses may limit the heating and cooling rates of temperature changes, boiler structure is exposed to variable temperature and stress field. The largest absolute value of thermal stresses occurs at the inner surface, where direct measurements are not possible to take, since the inner surface is in direct contact with hot water under high pressure. This was the reason to measure the temperature of boiler structure inside the boiler, on tube plate, as one of the critical part of the boiler. In this paper the experimental results of temperature measurement of tube plate were presented, during the regime of starting-up. Numerical model done by FEM was verified by experimental results. The performed analysis showed that the tube plate of the first reversing chamber, the boiler element with the thickest wall, is exposed to the highest thermal stresses. This part of the boiler is exposed to temperatures
t>500 ℃ and it is exposed to creep. In conditions of creep, continuous accumulation of plastic deformations occurs at a rate that depends on the level of stress, temperature and material characteristics.
PB  - Innovation Center of Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2021
T1  - EXPERIMENTAL AND NUMERICAL ANALYSIS OF HOT WATER BOILER IN START UP REGIME
SP  - 30
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7697
ER  - 

@conference{
author = "Rajić, Milena and Živković, Dragoljub and Banić, Milan and Mančić, Marko and Mitrović, Nenad and Milošević, Miloš",
year = "2021-07",
abstract = "The aim of the paper is to investigate the transient regime of hot water boiler numerically and experimentally. In the regime of starting up, as the most critical one, measurements were done on the boiler critical element. The operating characteristics as well as safe and reliable operation conditions of hot water boilers are limited by thermal stresses that occur in their structure. The greatest thermal stresses occur in transient operating regimes such as starting-up, changing operation mode or sudden shutdown, resulting in uneven heating or cooling of boiler elements. Large temperature gradients cause high thermal stresses that are especially critical
in elements with thick walls. As thermal stresses may limit the heating and cooling rates of temperature changes, boiler structure is exposed to variable temperature and stress field. The largest absolute value of thermal stresses occurs at the inner surface, where direct measurements are not possible to take, since the inner surface is in direct contact with hot water under high pressure. This was the reason to measure the temperature of boiler structure inside the boiler, on tube plate, as one of the critical part of the boiler. In this paper the experimental results of temperature measurement of tube plate were presented, during the regime of starting-up. Numerical model done by FEM was verified by experimental results. The performed analysis showed that the tube plate of the first reversing chamber, the boiler element with the thickest wall, is exposed to the highest thermal stresses. This part of the boiler is exposed to temperatures
t>500 ℃ and it is exposed to creep. In conditions of creep, continuous accumulation of plastic deformations occurs at a rate that depends on the level of stress, temperature and material characteristics.",
publisher = "Innovation Center of Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2021",
title = "EXPERIMENTAL AND NUMERICAL ANALYSIS OF HOT WATER BOILER IN START UP REGIME",
pages = "30",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7697"
}

Rajić, M., Živković, D., Banić, M., Mančić, M., Mitrović, N.,& Milošević, M.. (2021-07). EXPERIMENTAL AND NUMERICAL ANALYSIS OF HOT WATER BOILER IN START UP REGIME. in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2021
Innovation Center of Faculty of Mechanical Engineering., 30.
https://hdl.handle.net/21.15107/rcub_machinery_7697

Rajić M, Živković D, Banić M, Mančić M, Mitrović N, Milošević M. EXPERIMENTAL AND NUMERICAL ANALYSIS OF HOT WATER BOILER IN START UP REGIME. in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2021. 2021;:30.
https://hdl.handle.net/21.15107/rcub_machinery_7697 .

Rajić, Milena, Živković, Dragoljub, Banić, Milan, Mančić, Marko, Mitrović, Nenad, Milošević, Miloš, "EXPERIMENTAL AND NUMERICAL ANALYSIS OF HOT WATER BOILER IN START UP REGIME" in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2021 (2021-07):30,
https://hdl.handle.net/21.15107/rcub_machinery_7697 .

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 .