TY  - JOUR
AU  - Mitrašinović, Aleksandar M.
AU  - Momčilović, Dejan B.
AU  - Odanović, Zoran
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7500
AB  - Assessing heat released only related to the formation of primary crystals provides results with a significantly higher sensitivity than a traditional assessment of undercooling value. In this work, two similar Ti5B1 master alloys (commercial and refined) are used for grain refinement of Al7Si4Cu aluminum alloy to assess narrow differences in heat release during primary crystallization. The heat released related to primary crystallization is 2.50 +/- 0.03, 3.16 +/- 0.12, and 7.92 kJ kg(-1) for samples treated with the refined master alloys, commercial master alloys, and sample solidified without grain refinement, respectively. The acquired results showed that the suggested method is more efficient in comparison with traditional metallographic or undercooling methods for the assessment of grain refining efficiency with the potential to extend the suggested approach on a wide range of metallic structures where solidification occurs by eutectic-type primary crystallization characteristics.
PB  - Springer India, New Delhi
T2  - Transactions of the Indian Institute of Metals
T1  - Assessment of Grain Size and Grain Refinement Efficiency by Calculation of Released Heat Attributed to Formation of Primary Aluminum Crystals During Solidification of Al7Si4Cu Alloy
EP  - 1922
IS  - 8
SP  - 1917
VL  - 74
DO  - 10.1007/s12666-021-02279-6
ER  - 

@article{
author = "Mitrašinović, Aleksandar M. and Momčilović, Dejan B. and Odanović, Zoran",
abstract = "Assessing heat released only related to the formation of primary crystals provides results with a significantly higher sensitivity than a traditional assessment of undercooling value. In this work, two similar Ti5B1 master alloys (commercial and refined) are used for grain refinement of Al7Si4Cu aluminum alloy to assess narrow differences in heat release during primary crystallization. The heat released related to primary crystallization is 2.50 +/- 0.03, 3.16 +/- 0.12, and 7.92 kJ kg(-1) for samples treated with the refined master alloys, commercial master alloys, and sample solidified without grain refinement, respectively. The acquired results showed that the suggested method is more efficient in comparison with traditional metallographic or undercooling methods for the assessment of grain refining efficiency with the potential to extend the suggested approach on a wide range of metallic structures where solidification occurs by eutectic-type primary crystallization characteristics.",
publisher = "Springer India, New Delhi",
journal = "Transactions of the Indian Institute of Metals",
title = "Assessment of Grain Size and Grain Refinement Efficiency by Calculation of Released Heat Attributed to Formation of Primary Aluminum Crystals During Solidification of Al7Si4Cu Alloy",
pages = "1922-1917",
number = "8",
volume = "74",
doi = "10.1007/s12666-021-02279-6"
}

Mitrašinović, A. M., Momčilović, D. B.,& Odanović, Z..Assessment of Grain Size and Grain Refinement Efficiency by Calculation of Released Heat Attributed to Formation of Primary Aluminum Crystals During Solidification of Al7Si4Cu Alloy. in Transactions of the Indian Institute of Metals
Springer India, New Delhi., 74(8), 1917-1922.
https://doi.org/10.1007/s12666-021-02279-6

Mitrašinović AM, Momčilović DB, Odanović Z. Assessment of Grain Size and Grain Refinement Efficiency by Calculation of Released Heat Attributed to Formation of Primary Aluminum Crystals During Solidification of Al7Si4Cu Alloy. in Transactions of the Indian Institute of Metals.74(8):1917-1922.
doi:10.1007/s12666-021-02279-6 .

Mitrašinović, Aleksandar M., Momčilović, Dejan B., Odanović, Zoran, "Assessment of Grain Size and Grain Refinement Efficiency by Calculation of Released Heat Attributed to Formation of Primary Aluminum Crystals During Solidification of Al7Si4Cu Alloy" in Transactions of the Indian Institute of Metals, 74, no. 8:1917-1922,
https://doi.org/10.1007/s12666-021-02279-6 . .

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan B.
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7497
AB  - The contact fatigue is a localized phenomenon that occurs in highlystressed local zone of the material under the loaded contact region and as such ishighly nonlinear problem. This phenomenon exists in almost all real mechanicalsystems with contact strains coupled with other sources of nonlinear behaviour.The improvements of existing procedures and methods for standard calculationof contact fatigue have a potential to give significant contribution to increaseaccuracy of calculation of life assessment, reliability and efficiency of complexmechanical systems. This paper gives the basic explanation of the Theory ofcritical distances and its application on direct estimation of fatigue crackinitiation in contact zones. Analysis of contact fatigue when the contact zonesare subjected to additional nonlinearities such as geometry manufacturingdeviations, geometry microscale-damages or nonlinear material characteristicsare presented in detail. Few different real multi-nonlinear problems are used foranalysis performing. The benefits of presented approach are discussed by detailanalysis of the obtained results, and could be based on the increasing accuracyof contact fatigue prediction considering all existing nonlinearities in loadedcontact zones of complex mechanical systems.
C3  - 2nd Conference on Nonlinearity, Belgrade
T1  - Analysis of contact fatigue coupled with geometry and material nonlinearities by Theory of critical distances
EP  - 47
SP  - 27
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7497
ER  - 

@conference{
author = "Atanasovska, Ivana and Momčilović, Dejan B.",
abstract = "The contact fatigue is a localized phenomenon that occurs in highlystressed local zone of the material under the loaded contact region and as such ishighly nonlinear problem. This phenomenon exists in almost all real mechanicalsystems with contact strains coupled with other sources of nonlinear behaviour.The improvements of existing procedures and methods for standard calculationof contact fatigue have a potential to give significant contribution to increaseaccuracy of calculation of life assessment, reliability and efficiency of complexmechanical systems. This paper gives the basic explanation of the Theory ofcritical distances and its application on direct estimation of fatigue crackinitiation in contact zones. Analysis of contact fatigue when the contact zonesare subjected to additional nonlinearities such as geometry manufacturingdeviations, geometry microscale-damages or nonlinear material characteristicsare presented in detail. Few different real multi-nonlinear problems are used foranalysis performing. The benefits of presented approach are discussed by detailanalysis of the obtained results, and could be based on the increasing accuracyof contact fatigue prediction considering all existing nonlinearities in loadedcontact zones of complex mechanical systems.",
journal = "2nd Conference on Nonlinearity, Belgrade",
title = "Analysis of contact fatigue coupled with geometry and material nonlinearities by Theory of critical distances",
pages = "47-27",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7497"
}

Atanasovska, I.,& Momčilović, D. B..Analysis of contact fatigue coupled with geometry and material nonlinearities by Theory of critical distances. in 2nd Conference on Nonlinearity, Belgrade, 27-47.
https://hdl.handle.net/21.15107/rcub_machinery_7497

Atanasovska I, Momčilović DB. Analysis of contact fatigue coupled with geometry and material nonlinearities by Theory of critical distances. in 2nd Conference on Nonlinearity, Belgrade.:27-47.
https://hdl.handle.net/21.15107/rcub_machinery_7497 .

Atanasovska, Ivana, Momčilović, Dejan B., "Analysis of contact fatigue coupled with geometry and material nonlinearities by Theory of critical distances" in 2nd Conference on Nonlinearity, Belgrade:27-47,
https://hdl.handle.net/21.15107/rcub_machinery_7497 .

TY  - JOUR
AU  - Momčilović, Dejan B.
AU  - Hut, Nenad
AU  - Milović, Ljubica
AU  - Atanasovska, Ivana
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7496
AB  - Uprkos brojnim i skupim istraživanjima u oblasti zamora i loma kao i redovne kontrole gotovog proizvoda, prsline se javljaju svakodnevno u mnogim oblastima. Ovaj rad opisuje analizu otkaza spojnice lanca korišćene u konvejeru za transport cementa. Lančasti elevatori sa kašikom koriste spojnice za spajanje segmenata lanca i za vezivanje kašike za transport rasutog tereta. Površina kontakta između karike lanca i spojnice predstavlja jedno od najopterećenijih mesta na celom elevatoru. Tokom redovnog održavanja na upotrebljenim i novim spojnicama lanaca uočene su prsline u otvrdnutim termički obrađenim zonama. Radi povećanja otpornosti spojnica na habanje one se u oblasti kontakta sa karikom lanca termički obrađuju. Pojava prslina u novim nekorišćenim spojnicama pokrenula je ispitivanja sa ciljem da se utvrdi poreklo prslina na novim spojnicama. Pored ispitivanja uzroka nastanka ovih prslina u radu su navedeni predlozi mera za sprečavanje njihovog nastanka.
AB  - In spite of numerous and expensive research in the field of fatigue and fracture and regular control of end products, cracks occur every day in all fields of human activity. This paper describes failure analysis of chain brackets, used in conveyor systems for cement production. Chain type bucket elevators utilize chain brackets for joining segments of chain as well as for attaching brackets for bulk material transport. The contact zone between chain link and bracket is one of the most stressed in this elevator system. During regular maintenance, cracks are found on used and new brackets in the case hardened zone. Case hardening of the chain bracket is performed due to requirements for increased wear resistance of the chain link contact. The occurrence of cracks in new brackets raised the question regarding the origin of cracks and it is the main subject of this paper. This paper also suggests a solution for avoidance of cracks on chain brackets.
PB  - Integritet i vek konstrukcija, Beograd
T2  - Structural Integrity and Life
T1  - Analiza loma spojnice lanca
T1  - Failure analysis of chain bracket
EP  - 126
IS  - 2
SP  - 123
VL  - 11
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7496
ER  - 

@article{
author = "Momčilović, Dejan B. and Hut, Nenad and Milović, Ljubica and Atanasovska, Ivana",
abstract = "Uprkos brojnim i skupim istraživanjima u oblasti zamora i loma kao i redovne kontrole gotovog proizvoda, prsline se javljaju svakodnevno u mnogim oblastima. Ovaj rad opisuje analizu otkaza spojnice lanca korišćene u konvejeru za transport cementa. Lančasti elevatori sa kašikom koriste spojnice za spajanje segmenata lanca i za vezivanje kašike za transport rasutog tereta. Površina kontakta između karike lanca i spojnice predstavlja jedno od najopterećenijih mesta na celom elevatoru. Tokom redovnog održavanja na upotrebljenim i novim spojnicama lanaca uočene su prsline u otvrdnutim termički obrađenim zonama. Radi povećanja otpornosti spojnica na habanje one se u oblasti kontakta sa karikom lanca termički obrađuju. Pojava prslina u novim nekorišćenim spojnicama pokrenula je ispitivanja sa ciljem da se utvrdi poreklo prslina na novim spojnicama. Pored ispitivanja uzroka nastanka ovih prslina u radu su navedeni predlozi mera za sprečavanje njihovog nastanka., In spite of numerous and expensive research in the field of fatigue and fracture and regular control of end products, cracks occur every day in all fields of human activity. This paper describes failure analysis of chain brackets, used in conveyor systems for cement production. Chain type bucket elevators utilize chain brackets for joining segments of chain as well as for attaching brackets for bulk material transport. The contact zone between chain link and bracket is one of the most stressed in this elevator system. During regular maintenance, cracks are found on used and new brackets in the case hardened zone. Case hardening of the chain bracket is performed due to requirements for increased wear resistance of the chain link contact. The occurrence of cracks in new brackets raised the question regarding the origin of cracks and it is the main subject of this paper. This paper also suggests a solution for avoidance of cracks on chain brackets.",
publisher = "Integritet i vek konstrukcija, Beograd",
journal = "Structural Integrity and Life",
title = "Analiza loma spojnice lanca, Failure analysis of chain bracket",
pages = "126-123",
number = "2",
volume = "11",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7496"
}

Momčilović, D. B., Hut, N., Milović, L.,& Atanasovska, I..Analiza loma spojnice lanca. in Structural Integrity and Life
Integritet i vek konstrukcija, Beograd., 11(2), 123-126.
https://hdl.handle.net/21.15107/rcub_machinery_7496

Momčilović DB, Hut N, Milović L, Atanasovska I. Analiza loma spojnice lanca. in Structural Integrity and Life.11(2):123-126.
https://hdl.handle.net/21.15107/rcub_machinery_7496 .

Momčilović, Dejan B., Hut, Nenad, Milović, Ljubica, Atanasovska, Ivana, "Analiza loma spojnice lanca" in Structural Integrity and Life, 11, no. 2:123-126,
https://hdl.handle.net/21.15107/rcub_machinery_7496 .

TY  - JOUR
AU  - Vukšić Popović, Marija
AU  - Momčilović, Dejan
AU  - Tanasković, Jovan
AU  - Sedmak, Aleksandar
PY  - 2024
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7789
AB  - This paper presents an analysis of train screw coupling used mainly in Europe as mechanical
connection of wagons in train. An analysis of train breaks apart incidents revealed that less than
30 % of the cases were caused by elements of the screw coupling, with coupling links accounting
for only 5 % of the failures. Therefore, the investigation focused on testing the coupling links,
which are safety elements of the screw coupling. The coupling links underwent various inspections,
including visual inspection, dimensional control, non-destructive testing, examination
of chemical composition, and mechanical tests. Dimensional control found longitudinal plastic
deformations of the links. Chemical examination revealed that the links were made of different
material than recommended, but their mechanical properties generally met the recommended
values. However, variations were observed among different links, likely due to different rates of
deformation during testing and operational conditions. Overall, the analysis and inspections
provided insights into the condition and performance of coupling links in the screw coupling
system, highlighting the importance of monitoring and maintaining these elements to ensure safe
and efficient railway operations.
PB  - Elsevier
T2  - Engineering Failure Analysis
T1  - Testing of the condition and performance of coupling links from screw couplings of train
SP  - 108331
VL  - 161
DO  - 10.1016/j.engfailanal.2024.108331
ER  - 

@article{
author = "Vukšić Popović, Marija and Momčilović, Dejan and Tanasković, Jovan and Sedmak, Aleksandar",
year = "2024",
abstract = "This paper presents an analysis of train screw coupling used mainly in Europe as mechanical
connection of wagons in train. An analysis of train breaks apart incidents revealed that less than
30 % of the cases were caused by elements of the screw coupling, with coupling links accounting
for only 5 % of the failures. Therefore, the investigation focused on testing the coupling links,
which are safety elements of the screw coupling. The coupling links underwent various inspections,
including visual inspection, dimensional control, non-destructive testing, examination
of chemical composition, and mechanical tests. Dimensional control found longitudinal plastic
deformations of the links. Chemical examination revealed that the links were made of different
material than recommended, but their mechanical properties generally met the recommended
values. However, variations were observed among different links, likely due to different rates of
deformation during testing and operational conditions. Overall, the analysis and inspections
provided insights into the condition and performance of coupling links in the screw coupling
system, highlighting the importance of monitoring and maintaining these elements to ensure safe
and efficient railway operations.",
publisher = "Elsevier",
journal = "Engineering Failure Analysis",
title = "Testing of the condition and performance of coupling links from screw couplings of train",
pages = "108331",
volume = "161",
doi = "10.1016/j.engfailanal.2024.108331"
}

Vukšić Popović, M., Momčilović, D., Tanasković, J.,& Sedmak, A.. (2024). Testing of the condition and performance of coupling links from screw couplings of train. in Engineering Failure Analysis
Elsevier., 161, 108331.
https://doi.org/10.1016/j.engfailanal.2024.108331

Vukšić Popović M, Momčilović D, Tanasković J, Sedmak A. Testing of the condition and performance of coupling links from screw couplings of train. in Engineering Failure Analysis. 2024;161:108331.
doi:10.1016/j.engfailanal.2024.108331 .

Vukšić Popović, Marija, Momčilović, Dejan, Tanasković, Jovan, Sedmak, Aleksandar, "Testing of the condition and performance of coupling links from screw couplings of train" in Engineering Failure Analysis, 161 (2024):108331,
https://doi.org/10.1016/j.engfailanal.2024.108331 . .

TY  - JOUR
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan B.
AU  - Lazović, Tatjana
AU  - Marinković, Aleksandar
AU  - Soldat, Nataša
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6913
AB  - During the last few decades, the requirements for modern machine elements in terms of size reduction, increasing the energy efficiency, and a higher load capacity of standard and non-standard gears have been very prevalent issues. Within these demands, the main goals are the optimization of the gears’ tooth profiles, as well as the investigation of new tooth profile designs. The presented design idea is based on the optimal solutions inspired by nature. Special attention is paid to the new design of the tooth root zones of spur gears in order to decrease the stress concentration values and increase the tooth root fatigue resistance. The finite element method is used for stress and strain state calculations, and the particular gear pair is modeled and optimized for these purposes. For tooth root strength analysis, the estimations are based on the theory of critical distances and the stress gradients obtained through finite element analysis. The obtained stress gradients have shown important improvements in the stress distribution in the transition zone optimized by biomimetics. An analysis of the material variation influence is also performed. Based on the investigations of a particular gear pair, a significant stress reduction of about 7% for steel gears and about 10.3% for cast iron gears is obtained for tooth roots optimized by bio-inspired design.
PB  - MDPI AG, Basel, Switzerland
T2  - Biomimetics
T1  - Biomimetics Design of Tooth Root Zone at Cylindrical Gears Profile
IS  - 8(3)
SP  - 308
DO  - doi.org/10.3390/biomimetics8030308
ER  - 

@article{
author = "Atanasovska, Ivana and Momčilović, Dejan B. and Lazović, Tatjana and Marinković, Aleksandar and Soldat, Nataša",
year = "2023",
abstract = "During the last few decades, the requirements for modern machine elements in terms of size reduction, increasing the energy efficiency, and a higher load capacity of standard and non-standard gears have been very prevalent issues. Within these demands, the main goals are the optimization of the gears’ tooth profiles, as well as the investigation of new tooth profile designs. The presented design idea is based on the optimal solutions inspired by nature. Special attention is paid to the new design of the tooth root zones of spur gears in order to decrease the stress concentration values and increase the tooth root fatigue resistance. The finite element method is used for stress and strain state calculations, and the particular gear pair is modeled and optimized for these purposes. For tooth root strength analysis, the estimations are based on the theory of critical distances and the stress gradients obtained through finite element analysis. The obtained stress gradients have shown important improvements in the stress distribution in the transition zone optimized by biomimetics. An analysis of the material variation influence is also performed. Based on the investigations of a particular gear pair, a significant stress reduction of about 7% for steel gears and about 10.3% for cast iron gears is obtained for tooth roots optimized by bio-inspired design.",
publisher = "MDPI AG, Basel, Switzerland",
journal = "Biomimetics",
title = "Biomimetics Design of Tooth Root Zone at Cylindrical Gears Profile",
number = "8(3)",
pages = "308",
doi = "doi.org/10.3390/biomimetics8030308"
}

Atanasovska, I., Momčilović, D. B., Lazović, T., Marinković, A.,& Soldat, N.. (2023). Biomimetics Design of Tooth Root Zone at Cylindrical Gears Profile. in Biomimetics
MDPI AG, Basel, Switzerland.(8(3)), 308.
https://doi.org/doi.org/10.3390/biomimetics8030308

Atanasovska I, Momčilović DB, Lazović T, Marinković A, Soldat N. Biomimetics Design of Tooth Root Zone at Cylindrical Gears Profile. in Biomimetics. 2023;(8(3)):308.
doi:doi.org/10.3390/biomimetics8030308 .

Atanasovska, Ivana, Momčilović, Dejan B., Lazović, Tatjana, Marinković, Aleksandar, Soldat, Nataša, "Biomimetics Design of Tooth Root Zone at Cylindrical Gears Profile" in Biomimetics, no. 8(3) (2023):308,
https://doi.org/doi.org/10.3390/biomimetics8030308 . .

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan B.
AU  - Lazović, Tatjana
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6974
C3  - Proceedings of the Third International Nonlinear Dynamics Conference - NODYCON 2023
T1  - Mathematical Modelling of a Coefficient of Nonlinearity in Dynamics of Deep Groove Ball Bearing with Damage
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6974
ER  - 

@conference{
author = "Atanasovska, Ivana and Momčilović, Dejan B. and Lazović, Tatjana",
year = "2023",
journal = "Proceedings of the Third International Nonlinear Dynamics Conference - NODYCON 2023",
title = "Mathematical Modelling of a Coefficient of Nonlinearity in Dynamics of Deep Groove Ball Bearing with Damage",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6974"
}

Atanasovska, I., Momčilović, D. B.,& Lazović, T.. (2023). Mathematical Modelling of a Coefficient of Nonlinearity in Dynamics of Deep Groove Ball Bearing with Damage. in Proceedings of the Third International Nonlinear Dynamics Conference - NODYCON 2023.
https://hdl.handle.net/21.15107/rcub_machinery_6974

Atanasovska I, Momčilović DB, Lazović T. Mathematical Modelling of a Coefficient of Nonlinearity in Dynamics of Deep Groove Ball Bearing with Damage. in Proceedings of the Third International Nonlinear Dynamics Conference - NODYCON 2023. 2023;.
https://hdl.handle.net/21.15107/rcub_machinery_6974 .

Atanasovska, Ivana, Momčilović, Dejan B., Lazović, Tatjana, "Mathematical Modelling of a Coefficient of Nonlinearity in Dynamics of Deep Groove Ball Bearing with Damage" in Proceedings of the Third International Nonlinear Dynamics Conference - NODYCON 2023 (2023),
https://hdl.handle.net/21.15107/rcub_machinery_6974 .

TY  - JOUR
AU  - Milić, Milica
AU  - Svorcan, Jelena
AU  - Zorić, Nemanja
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan B.
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6955
AB  - Composite materials have been extensively employed in the aviation industry in recent years. The application of new materials enables significant weight savings with improved mechanical characteristics. This is also very important in the field of development of unmanned aerial vehicles (UAV). In the design phases, it is necessary to perceive all the aspects that are important for the structure and consider different load cases. The relationship between weight and strength proved to be important. This means that detailed strength analyses of each structural part are indispensable. In particular, primary load-bearing structures must sustain all types of loads without fail. Failure of the structure can affect the motion of the UAV during the mission or lead to a crash and significant losses. This paper presents the research performed on the failure analysis of a composite beam of a novel UAV. During the testing phase, under an unpredictable load condition followed by a crash landing, failure of the structure occurred on a beam element. The study was performed to determine the cause of the failure of certain layers of the composite laminate, because the previous calculation showed that it met the criteria for which it was dimensioned. Based on the telemetry data and the impact load that was registered, a complementary numerical and experimental analyses were performed to determine what happened and why. Composite test specimens were extracted from the beam and subjected to standard tensile tests, in order to determine the actual mechanical characteristics of the layered material. The paper presents in detail the comparison of the results as well as the methodology used in this research.
PB  - London : Sage Publications Ltd
T2  - Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
T1  - Mathematical modeling and experimental investigation of a composite beam failure - Case study
EP  - 12
SP  - 1
DO  - 10.1177/09544062231179078
ER  - 

@article{
author = "Milić, Milica and Svorcan, Jelena and Zorić, Nemanja and Atanasovska, Ivana and Momčilović, Dejan B.",
year = "2023",
abstract = "Composite materials have been extensively employed in the aviation industry in recent years. The application of new materials enables significant weight savings with improved mechanical characteristics. This is also very important in the field of development of unmanned aerial vehicles (UAV). In the design phases, it is necessary to perceive all the aspects that are important for the structure and consider different load cases. The relationship between weight and strength proved to be important. This means that detailed strength analyses of each structural part are indispensable. In particular, primary load-bearing structures must sustain all types of loads without fail. Failure of the structure can affect the motion of the UAV during the mission or lead to a crash and significant losses. This paper presents the research performed on the failure analysis of a composite beam of a novel UAV. During the testing phase, under an unpredictable load condition followed by a crash landing, failure of the structure occurred on a beam element. The study was performed to determine the cause of the failure of certain layers of the composite laminate, because the previous calculation showed that it met the criteria for which it was dimensioned. Based on the telemetry data and the impact load that was registered, a complementary numerical and experimental analyses were performed to determine what happened and why. Composite test specimens were extracted from the beam and subjected to standard tensile tests, in order to determine the actual mechanical characteristics of the layered material. The paper presents in detail the comparison of the results as well as the methodology used in this research.",
publisher = "London : Sage Publications Ltd",
journal = "Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science",
title = "Mathematical modeling and experimental investigation of a composite beam failure - Case study",
pages = "12-1",
doi = "10.1177/09544062231179078"
}

Milić, M., Svorcan, J., Zorić, N., Atanasovska, I.,& Momčilović, D. B.. (2023). Mathematical modeling and experimental investigation of a composite beam failure - Case study. in Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
London : Sage Publications Ltd., 1-12.
https://doi.org/10.1177/09544062231179078

Milić M, Svorcan J, Zorić N, Atanasovska I, Momčilović DB. Mathematical modeling and experimental investigation of a composite beam failure - Case study. in Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science. 2023;:1-12.
doi:10.1177/09544062231179078 .

Milić, Milica, Svorcan, Jelena, Zorić, Nemanja, Atanasovska, Ivana, Momčilović, Dejan B., "Mathematical modeling and experimental investigation of a composite beam failure - Case study" in Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science (2023):1-12,
https://doi.org/10.1177/09544062231179078 . .

TY  - JOUR
AU  - Momčilović, Dejan B.
AU  - Atanasovska, Ivana
AU  - Vulović, Snežana
AU  - Pavlović, Ana
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7523
AB  - The repair of structural elements for the prestressing of reinforced concrete is necessarywhen existing prestressing wires are damaged or after a certain period of time. The objective of thispaper is to describe the methodology for the life assessment of corroded prestressing wires, sampledfrom prestressed concrete elements after a few decades of use. The aim of the presented research wasto determine the real properties of corroded wire in terms of the evaluation of remaining load capacityusing the Theory of Critical Distances (TCD). The methodology also includes spatial 3D characterizationof corroded surfaces, determination of mechanical properties, and Finite Element Analysis (FEA)of a model of wire with corrosion pits. The final goal of the presented methodology is to enable moreefficient evaluation of repair range and options for the elements of mechanical prestressing systemswithin various structures. The results and conclusions indicate that the developed methodology,based on the interdisciplinary approach and implementation of state-of-the-art methods, has a highapplicability potential for both static and fatigue fracture prediction in the case of prestressed wires.The proposed method has a huge potential for simple and fast prediction of the life assessment ofengineering structures, particularly for damaged elements with arbitrary geometry features
PB  - MDPI
T2  - Metals
T1  - Life Assessment of Corroded Wire for Prestressing
IS  - 2
VL  - 13
DO  - 10.3390/met13020387
ER  - 

@article{
author = "Momčilović, Dejan B. and Atanasovska, Ivana and Vulović, Snežana and Pavlović, Ana",
year = "2023",
abstract = "The repair of structural elements for the prestressing of reinforced concrete is necessarywhen existing prestressing wires are damaged or after a certain period of time. The objective of thispaper is to describe the methodology for the life assessment of corroded prestressing wires, sampledfrom prestressed concrete elements after a few decades of use. The aim of the presented research wasto determine the real properties of corroded wire in terms of the evaluation of remaining load capacityusing the Theory of Critical Distances (TCD). The methodology also includes spatial 3D characterizationof corroded surfaces, determination of mechanical properties, and Finite Element Analysis (FEA)of a model of wire with corrosion pits. The final goal of the presented methodology is to enable moreefficient evaluation of repair range and options for the elements of mechanical prestressing systemswithin various structures. The results and conclusions indicate that the developed methodology,based on the interdisciplinary approach and implementation of state-of-the-art methods, has a highapplicability potential for both static and fatigue fracture prediction in the case of prestressed wires.The proposed method has a huge potential for simple and fast prediction of the life assessment ofengineering structures, particularly for damaged elements with arbitrary geometry features",
publisher = "MDPI",
journal = "Metals",
title = "Life Assessment of Corroded Wire for Prestressing",
number = "2",
volume = "13",
doi = "10.3390/met13020387"
}

Momčilović, D. B., Atanasovska, I., Vulović, S.,& Pavlović, A.. (2023). Life Assessment of Corroded Wire for Prestressing. in Metals
MDPI., 13(2).
https://doi.org/10.3390/met13020387

Momčilović DB, Atanasovska I, Vulović S, Pavlović A. Life Assessment of Corroded Wire for Prestressing. in Metals. 2023;13(2).
doi:10.3390/met13020387 .

Momčilović, Dejan B., Atanasovska, Ivana, Vulović, Snežana, Pavlović, Ana, "Life Assessment of Corroded Wire for Prestressing" in Metals, 13, no. 2 (2023),
https://doi.org/10.3390/met13020387 . .

TY  - CONF
AU  - Stojiljković, Bratislav
AU  - Momčilović, Dejan B.
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7511
AB  - The results of the scientific research work and creativity of Nikola Tesla (Smiljan, 1856 - New York, 1943), a Serbian-American scientist, engineer and inventor, represent the foundation of new technical and technological breakthroughs that began at the end of the 19th century, and without        which        our        everyday        life        would         be         unthinkable. The legacy of Nikola Tesla is located in his museum in Belgrade and present unique collection composed from archive documents, different items (personal and technical items) and library (monographies,          periodical          publications          and          newspaper          clips). The number of original technical items from Tesla's legacy (295 in total) is finite and unchangeable. The collection of items from the field of mechanical engineering consists of 122 different museum artifacts from the following areas: turbo machines, tribology, speed measurement, length measurement, temperature measurement, measuring tools, accessories for technical drawing and writing, machine assemblies and elements, etc. The most numerous groups of objects consist of springs (coil-cylindrical, spiral strip), a total of 30 exhibits. Models of spiral cylindrical springs, depending on how they are loaded, are compression (8 pcs.) or tension type (14 pcs.). The aim of this paper is to present preserved models and to examine the physical-chemical and mechanical properties and contribute with additional knowledge to the Nikola Tesla legacy.
PB  - University of Belgrade - Faculty of Mechanical Engineering, Belgrade, Serbia
C3  - 1st International Conference on Mathematical Modelling in Mechanics and Engineering Mathematical Institute SANU
T1  - Examination of the physical-chemical and mechanical properties of helical cylindrical compression springs preserved in the Legacy in the Nikola Tesla Museum
SP  - 153
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7511
ER  - 

@conference{
author = "Stojiljković, Bratislav and Momčilović, Dejan B.",
year = "2022",
abstract = "The results of the scientific research work and creativity of Nikola Tesla (Smiljan, 1856 - New York, 1943), a Serbian-American scientist, engineer and inventor, represent the foundation of new technical and technological breakthroughs that began at the end of the 19th century, and without        which        our        everyday        life        would         be         unthinkable. The legacy of Nikola Tesla is located in his museum in Belgrade and present unique collection composed from archive documents, different items (personal and technical items) and library (monographies,          periodical          publications          and          newspaper          clips). The number of original technical items from Tesla's legacy (295 in total) is finite and unchangeable. The collection of items from the field of mechanical engineering consists of 122 different museum artifacts from the following areas: turbo machines, tribology, speed measurement, length measurement, temperature measurement, measuring tools, accessories for technical drawing and writing, machine assemblies and elements, etc. The most numerous groups of objects consist of springs (coil-cylindrical, spiral strip), a total of 30 exhibits. Models of spiral cylindrical springs, depending on how they are loaded, are compression (8 pcs.) or tension type (14 pcs.). The aim of this paper is to present preserved models and to examine the physical-chemical and mechanical properties and contribute with additional knowledge to the Nikola Tesla legacy.",
publisher = "University of Belgrade - Faculty of Mechanical Engineering, Belgrade, Serbia",
journal = "1st International Conference on Mathematical Modelling in Mechanics and Engineering Mathematical Institute SANU",
title = "Examination of the physical-chemical and mechanical properties of helical cylindrical compression springs preserved in the Legacy in the Nikola Tesla Museum",
pages = "153",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7511"
}

Stojiljković, B.,& Momčilović, D. B.. (2022). Examination of the physical-chemical and mechanical properties of helical cylindrical compression springs preserved in the Legacy in the Nikola Tesla Museum. in 1st International Conference on Mathematical Modelling in Mechanics and Engineering Mathematical Institute SANU
University of Belgrade - Faculty of Mechanical Engineering, Belgrade, Serbia., 153.
https://hdl.handle.net/21.15107/rcub_machinery_7511

Stojiljković B, Momčilović DB. Examination of the physical-chemical and mechanical properties of helical cylindrical compression springs preserved in the Legacy in the Nikola Tesla Museum. in 1st International Conference on Mathematical Modelling in Mechanics and Engineering Mathematical Institute SANU. 2022;:153.
https://hdl.handle.net/21.15107/rcub_machinery_7511 .

Stojiljković, Bratislav, Momčilović, Dejan B., "Examination of the physical-chemical and mechanical properties of helical cylindrical compression springs preserved in the Legacy in the Nikola Tesla Museum" in 1st International Conference on Mathematical Modelling in Mechanics and Engineering Mathematical Institute SANU (2022):153,
https://hdl.handle.net/21.15107/rcub_machinery_7511 .

TY  - CONF
AU  - Milić, Milica
AU  - Atanasovska, Ivana
AU  - Ristić, Ognjen
AU  - Momčilović, Dejan B.
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7513
AB  - The high level of worthiness of unmanned aerial vehicles (UAV), particularly in everyday life, is something that will be common thing in close future. The design solutions for UAV us subject of constant innovation, focused on the improving structure performances and weight reducing. The use of new materials. like various composites, is necessary during this process to fulfill such demanding structural design requirements. Despite the fact that such kind of composite made UAV structures are subjected to the detailed calculation procedures and experimental verifications in the design phase, the fracture and failure can occur during testing in real operation conditions. The redesign procedure is required in order to overcome the noted issues.This paper describes failure analysis, as well as structural redesign procedure for a beam element of an unconventional UAV. The fracture analysis is based on the numerical calculations of the deformation and stress state of the element, as well as experimental investigation of material characteristics. The developed redesign solution contains modifications in material of the element, as well as the changes in the structure design of the failure zone. The Finite Element Analysis is performed and discussed for both of the element structures: original design and redesign based on the fracture analysis. The conclusions obtained by the comparison of these Finite Element Analyses show the significant structure improvements in the stress concentration zone, achieved by the proposed redesign.
PB  - University of Belgrade - Faculty of Mechanical Engineering, Belgrade, Serbia
C3  - 1st International Conference on Mathematical Modelling in Mechanics and Engineering Mathematical Institute SANU
T1  - Failure analysis of beam of unmanned aerial vehicle
SP  - 156
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7513
ER  - 

@conference{
author = "Milić, Milica and Atanasovska, Ivana and Ristić, Ognjen and Momčilović, Dejan B.",
year = "2022",
abstract = "The high level of worthiness of unmanned aerial vehicles (UAV), particularly in everyday life, is something that will be common thing in close future. The design solutions for UAV us subject of constant innovation, focused on the improving structure performances and weight reducing. The use of new materials. like various composites, is necessary during this process to fulfill such demanding structural design requirements. Despite the fact that such kind of composite made UAV structures are subjected to the detailed calculation procedures and experimental verifications in the design phase, the fracture and failure can occur during testing in real operation conditions. The redesign procedure is required in order to overcome the noted issues.This paper describes failure analysis, as well as structural redesign procedure for a beam element of an unconventional UAV. The fracture analysis is based on the numerical calculations of the deformation and stress state of the element, as well as experimental investigation of material characteristics. The developed redesign solution contains modifications in material of the element, as well as the changes in the structure design of the failure zone. The Finite Element Analysis is performed and discussed for both of the element structures: original design and redesign based on the fracture analysis. The conclusions obtained by the comparison of these Finite Element Analyses show the significant structure improvements in the stress concentration zone, achieved by the proposed redesign.",
publisher = "University of Belgrade - Faculty of Mechanical Engineering, Belgrade, Serbia",
journal = "1st International Conference on Mathematical Modelling in Mechanics and Engineering Mathematical Institute SANU",
title = "Failure analysis of beam of unmanned aerial vehicle",
pages = "156",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7513"
}

Milić, M., Atanasovska, I., Ristić, O.,& Momčilović, D. B.. (2022). Failure analysis of beam of unmanned aerial vehicle. in 1st International Conference on Mathematical Modelling in Mechanics and Engineering Mathematical Institute SANU
University of Belgrade - Faculty of Mechanical Engineering, Belgrade, Serbia., 156.
https://hdl.handle.net/21.15107/rcub_machinery_7513

Milić M, Atanasovska I, Ristić O, Momčilović DB. Failure analysis of beam of unmanned aerial vehicle. in 1st International Conference on Mathematical Modelling in Mechanics and Engineering Mathematical Institute SANU. 2022;:156.
https://hdl.handle.net/21.15107/rcub_machinery_7513 .

Milić, Milica, Atanasovska, Ivana, Ristić, Ognjen, Momčilović, Dejan B., "Failure analysis of beam of unmanned aerial vehicle" in 1st International Conference on Mathematical Modelling in Mechanics and Engineering Mathematical Institute SANU (2022):156,
https://hdl.handle.net/21.15107/rcub_machinery_7513 .

TY  - CONF
AU  - Ilić, Dragoljub
AU  - Milošević, Dragan
AU  - Momčilović, Dejan B.
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7528
AB  - During regular operation, hydro turbine elements have complex operating conditions. In order to prevent major failures, among other common preventive measures, it is necessary to make a useful model of hydro turbine. Development of this model was focused on real elements and data set of real operating history. To solve this, an integral diagnostic approach is used. Based on the real diagnostics data of the condition and data history of the hydro turbine shaft and the designed life expectancy, a multi-layer perceptron (MLP) based artificial neural network (ANN) is built. The idea with this model was to enable to life assessment of the turbine shaft in any particular moment during regular operation.This paper describes a model for estimating the condition of the shafts of turbines of the current generator in Hydropower plant Derdap 2. The significance of this approach is that real experimental data support development of ML ANN (number of neurons and layers) topology, which is optimal for this model, training and testing. Results obtained from this model are used for decision-making about the planning time schedule of maintenance actions, as well as reducing overhaul time and direct losses.
PB  - University of Belgrade - Faculty of Mechanical Engineering, Belgrade, Serbia
C3  - 1st International Conference on Mathematical Modelling in Mechanics and Engineering Mathematical Institute SANU
T1  - Neural network model for the condition assessment of hydro turbines
SP  - 154
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7528
ER  - 

@conference{
author = "Ilić, Dragoljub and Milošević, Dragan and Momčilović, Dejan B.",
year = "2022",
abstract = "During regular operation, hydro turbine elements have complex operating conditions. In order to prevent major failures, among other common preventive measures, it is necessary to make a useful model of hydro turbine. Development of this model was focused on real elements and data set of real operating history. To solve this, an integral diagnostic approach is used. Based on the real diagnostics data of the condition and data history of the hydro turbine shaft and the designed life expectancy, a multi-layer perceptron (MLP) based artificial neural network (ANN) is built. The idea with this model was to enable to life assessment of the turbine shaft in any particular moment during regular operation.This paper describes a model for estimating the condition of the shafts of turbines of the current generator in Hydropower plant Derdap 2. The significance of this approach is that real experimental data support development of ML ANN (number of neurons and layers) topology, which is optimal for this model, training and testing. Results obtained from this model are used for decision-making about the planning time schedule of maintenance actions, as well as reducing overhaul time and direct losses.",
publisher = "University of Belgrade - Faculty of Mechanical Engineering, Belgrade, Serbia",
journal = "1st International Conference on Mathematical Modelling in Mechanics and Engineering Mathematical Institute SANU",
title = "Neural network model for the condition assessment of hydro turbines",
pages = "154",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7528"
}

Ilić, D., Milošević, D.,& Momčilović, D. B.. (2022). Neural network model for the condition assessment of hydro turbines. in 1st International Conference on Mathematical Modelling in Mechanics and Engineering Mathematical Institute SANU
University of Belgrade - Faculty of Mechanical Engineering, Belgrade, Serbia., 154.
https://hdl.handle.net/21.15107/rcub_machinery_7528

Ilić D, Milošević D, Momčilović DB. Neural network model for the condition assessment of hydro turbines. in 1st International Conference on Mathematical Modelling in Mechanics and Engineering Mathematical Institute SANU. 2022;:154.
https://hdl.handle.net/21.15107/rcub_machinery_7528 .

Ilić, Dragoljub, Milošević, Dragan, Momčilović, Dejan B., "Neural network model for the condition assessment of hydro turbines" in 1st International Conference on Mathematical Modelling in Mechanics and Engineering Mathematical Institute SANU (2022):154,
https://hdl.handle.net/21.15107/rcub_machinery_7528 .

TY  - JOUR
AU  - Manojlović, Vaso D.
AU  - Kamberović, Željko J.
AU  - Sokić, Miroslav D.
AU  - Momčilović, Dejan B.
AU  - Gavrilovski, Milorad
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7545
AB  - U radu je prikazana nova tehnologija aluminotermijskog zavarivanja (AT) prelaznih šina 49E1 na 60E1(EN 13674-1:2005.), oslonjena na potpuno nove materijale. Ona se odnosi na pešćane kalupe kod kojih su oblik i dimenzije ulivnog sistema projektovani tako da mogu odgovoriti svim zahtevima za postizanje zavarenih spojeva zadatog kvaliteta. Da bi ovaj zahtev bio u potpunosti ispunjen, projektovana je, takođe, AT smeša, čijom se aktivacijom dobija termitni čelik za ispunu, sa temperaturom izlivanja koja obezbeđuje optimalnu livkost metala, kao i viskoznost troske. U radu su zatim prikazani rezultati ispitivanja probnih prelaznih zavarenih spojeva, shodno standardima JŽS.Z2.610 i EN 14730-1:2012, a odnose se na utvrđivanje mehaničkih svojstava zavarenih spojeva, makrostruktirnih i mikrostrukturnih karakteristika, homogenosti i hemijskog sastava termitnog čelika za ispunu. Dobijeni rezultati pokazuju da je primenjena tehnologija optimalna, jer obezbeđuje upotrebu ove tehnologije u industrijskim uslovima na železnici.
AB  - The paper presents a new aluminothermic (AT) welding technology of 49E1 transition rails on 60E1 (EN 13674-1: 2005), based on entirely new materials. It refers to sand molds in which the shape and dimensions of the inflow system are designed to meet all requirements for achieving welded joints of a given quality. The AT mixture was also designed to fulfill those requests; resulting liquid steel has a casting temperature that ensures optimal castability of the metal and slag viscosity. The paper presents the test results of the transients welded joints, following the standards JŽS.Z2.610 and EN 14730-1: 2012, and relates to the determination of mechanical properties of welded joints macrostructural and microstructural characteristics, homogeneity, and chemical composition of thermite steel. The obtained results show that the applied technology is optimal because it ensures the use of this technology in industrial conditions on the railway.
PB  - Savez inženjera i tehničara Srbije, Beograd
T2  - Tehnika
T1  - Unapređenje tehnologije aluminotermijskog zavarivanja železničkih šina različitog poprečnog preseka
T1  - Improvement of at-welding technology of railway rails with different cross sections
EP  - 761
IS  - 6
SP  - 756
VL  - 76
DO  - 10.5937/tehnika2106756M
ER  - 

@article{
author = "Manojlović, Vaso D. and Kamberović, Željko J. and Sokić, Miroslav D. and Momčilović, Dejan B. and Gavrilovski, Milorad",
year = "2021",
abstract = "U radu je prikazana nova tehnologija aluminotermijskog zavarivanja (AT) prelaznih šina 49E1 na 60E1(EN 13674-1:2005.), oslonjena na potpuno nove materijale. Ona se odnosi na pešćane kalupe kod kojih su oblik i dimenzije ulivnog sistema projektovani tako da mogu odgovoriti svim zahtevima za postizanje zavarenih spojeva zadatog kvaliteta. Da bi ovaj zahtev bio u potpunosti ispunjen, projektovana je, takođe, AT smeša, čijom se aktivacijom dobija termitni čelik za ispunu, sa temperaturom izlivanja koja obezbeđuje optimalnu livkost metala, kao i viskoznost troske. U radu su zatim prikazani rezultati ispitivanja probnih prelaznih zavarenih spojeva, shodno standardima JŽS.Z2.610 i EN 14730-1:2012, a odnose se na utvrđivanje mehaničkih svojstava zavarenih spojeva, makrostruktirnih i mikrostrukturnih karakteristika, homogenosti i hemijskog sastava termitnog čelika za ispunu. Dobijeni rezultati pokazuju da je primenjena tehnologija optimalna, jer obezbeđuje upotrebu ove tehnologije u industrijskim uslovima na železnici., The paper presents a new aluminothermic (AT) welding technology of 49E1 transition rails on 60E1 (EN 13674-1: 2005), based on entirely new materials. It refers to sand molds in which the shape and dimensions of the inflow system are designed to meet all requirements for achieving welded joints of a given quality. The AT mixture was also designed to fulfill those requests; resulting liquid steel has a casting temperature that ensures optimal castability of the metal and slag viscosity. The paper presents the test results of the transients welded joints, following the standards JŽS.Z2.610 and EN 14730-1: 2012, and relates to the determination of mechanical properties of welded joints macrostructural and microstructural characteristics, homogeneity, and chemical composition of thermite steel. The obtained results show that the applied technology is optimal because it ensures the use of this technology in industrial conditions on the railway.",
publisher = "Savez inženjera i tehničara Srbije, Beograd",
journal = "Tehnika",
title = "Unapređenje tehnologije aluminotermijskog zavarivanja železničkih šina različitog poprečnog preseka, Improvement of at-welding technology of railway rails with different cross sections",
pages = "761-756",
number = "6",
volume = "76",
doi = "10.5937/tehnika2106756M"
}

Manojlović, V. D., Kamberović, Ž. J., Sokić, M. D., Momčilović, D. B.,& Gavrilovski, M.. (2021). Unapređenje tehnologije aluminotermijskog zavarivanja železničkih šina različitog poprečnog preseka. in Tehnika
Savez inženjera i tehničara Srbije, Beograd., 76(6), 756-761.
https://doi.org/10.5937/tehnika2106756M

Manojlović VD, Kamberović ŽJ, Sokić MD, Momčilović DB, Gavrilovski M. Unapređenje tehnologije aluminotermijskog zavarivanja železničkih šina različitog poprečnog preseka. in Tehnika. 2021;76(6):756-761.
doi:10.5937/tehnika2106756M .

Manojlović, Vaso D., Kamberović, Željko J., Sokić, Miroslav D., Momčilović, Dejan B., Gavrilovski, Milorad, "Unapređenje tehnologije aluminotermijskog zavarivanja železničkih šina različitog poprečnog preseka" in Tehnika, 76, no. 6 (2021):756-761,
https://doi.org/10.5937/tehnika2106756M . .

TY  - JOUR
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan B.
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7518
AB  - The basic definitions and a history of the development of biomimetics as a discipline thatconsiders nature-inspired design are presented in this paper. The discussion and the results of theapplication of principles of nature-inspired design in machine elements design are given. The factthat transition zones that Nature chose and designed on trees in many cases survived for morethan a hundred years, resisting on the various and variable external loads and other externalconditions, is considered. Presented case study used the nature-inspired transition shapes in theresearch of innovative design and geometric optimization of transition zones of high-loadedshafts. The comparative Finite Element Analysis is performed for a particular transition zone withtraditional engineering design, as well as with nature-inspired design. The conclusions about theincrease of load capacity that is obtained with innovative biomimetics design are discussed.
T2  - Journal of the Serbian Society for Computational Mechanics
T1  - Geometric optimization of transition zones based on biomimetics principles
EP  - 45
IS  - 2
SP  - 32
VL  - 15
DO  - 10.24874/jsscm.2021.15.02.04
ER  - 

@article{
author = "Atanasovska, Ivana and Momčilović, Dejan B.",
year = "2021",
abstract = "The basic definitions and a history of the development of biomimetics as a discipline thatconsiders nature-inspired design are presented in this paper. The discussion and the results of theapplication of principles of nature-inspired design in machine elements design are given. The factthat transition zones that Nature chose and designed on trees in many cases survived for morethan a hundred years, resisting on the various and variable external loads and other externalconditions, is considered. Presented case study used the nature-inspired transition shapes in theresearch of innovative design and geometric optimization of transition zones of high-loadedshafts. The comparative Finite Element Analysis is performed for a particular transition zone withtraditional engineering design, as well as with nature-inspired design. The conclusions about theincrease of load capacity that is obtained with innovative biomimetics design are discussed.",
journal = "Journal of the Serbian Society for Computational Mechanics",
title = "Geometric optimization of transition zones based on biomimetics principles",
pages = "45-32",
number = "2",
volume = "15",
doi = "10.24874/jsscm.2021.15.02.04"
}

Atanasovska, I.,& Momčilović, D. B.. (2021). Geometric optimization of transition zones based on biomimetics principles. in Journal of the Serbian Society for Computational Mechanics, 15(2), 32-45.
https://doi.org/10.24874/jsscm.2021.15.02.04

Atanasovska I, Momčilović DB. Geometric optimization of transition zones based on biomimetics principles. in Journal of the Serbian Society for Computational Mechanics. 2021;15(2):32-45.
doi:10.24874/jsscm.2021.15.02.04 .

Atanasovska, Ivana, Momčilović, Dejan B., "Geometric optimization of transition zones based on biomimetics principles" in Journal of the Serbian Society for Computational Mechanics, 15, no. 2 (2021):32-45,
https://doi.org/10.24874/jsscm.2021.15.02.04 . .

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan B.
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7517
AB  - The presented research primarily considers with the geometric solutions that Nature has optimized. In the study presented in this paper, the nature inspired transition shapes are used in the research of innovative design and geometric optimization of transition zones of the high-loaded shafts.
C3  - 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia
T1  - Geometric optimization of shaft transition zone based on stress-strain analysis of nature inspired design
EP  - 187
SP  - 186
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7517
ER  - 

@conference{
author = "Atanasovska, Ivana and Momčilović, Dejan B.",
year = "2021",
abstract = "The presented research primarily considers with the geometric solutions that Nature has optimized. In the study presented in this paper, the nature inspired transition shapes are used in the research of innovative design and geometric optimization of transition zones of the high-loaded shafts.",
journal = "8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia",
title = "Geometric optimization of shaft transition zone based on stress-strain analysis of nature inspired design",
pages = "187-186",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7517"
}

Atanasovska, I.,& Momčilović, D. B.. (2021). Geometric optimization of shaft transition zone based on stress-strain analysis of nature inspired design. in 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia, 186-187.
https://hdl.handle.net/21.15107/rcub_machinery_7517

Atanasovska I, Momčilović DB. Geometric optimization of shaft transition zone based on stress-strain analysis of nature inspired design. in 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia. 2021;:186-187.
https://hdl.handle.net/21.15107/rcub_machinery_7517 .

Atanasovska, Ivana, Momčilović, Dejan B., "Geometric optimization of shaft transition zone based on stress-strain analysis of nature inspired design" in 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia (2021):186-187,
https://hdl.handle.net/21.15107/rcub_machinery_7517 .

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan B.
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7498
AB  - Hertz contact and the resulting stress-strain state arising from the contact between two elastic solids have practical application in hardness testing, wear and impact damage of engineering ceramics, the design of dental prostheses, gear teeth, ball and roller bearings and many other engineering applications. Although the common concepts for studying these problems implies that the analysis is perform taking into account that elastic solids are imperfection free, the real problems, as well as various failure analysis, underline significance in taking into account those imperfections, [1]. Imperfections in metallic materials can be non-metallic inclusions, carbides, pores and other microstructural defects, [1, 2]. This paper describes model of two cylinders in contact made by metallic material with carbides. The Finite Element Analysis (FEA) is performed in order to discuss the influence of position, orientation and dimension of carbides on Hertz stresses for two cylinders in contact. Fig.1a shows the FEA model developed for calculation the Hertz stress state for two cylinders, and Fig.2 shows the position and dimension of carbides for two of the series of modelled cases.
C3  - 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia
T1  - Analysis of Hertz contact stresses for metallic material with carbides
EP  - 217
SP  - 216
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7498
ER  - 

@conference{
author = "Atanasovska, Ivana and Momčilović, Dejan B.",
year = "2021",
abstract = "Hertz contact and the resulting stress-strain state arising from the contact between two elastic solids have practical application in hardness testing, wear and impact damage of engineering ceramics, the design of dental prostheses, gear teeth, ball and roller bearings and many other engineering applications. Although the common concepts for studying these problems implies that the analysis is perform taking into account that elastic solids are imperfection free, the real problems, as well as various failure analysis, underline significance in taking into account those imperfections, [1]. Imperfections in metallic materials can be non-metallic inclusions, carbides, pores and other microstructural defects, [1, 2]. This paper describes model of two cylinders in contact made by metallic material with carbides. The Finite Element Analysis (FEA) is performed in order to discuss the influence of position, orientation and dimension of carbides on Hertz stresses for two cylinders in contact. Fig.1a shows the FEA model developed for calculation the Hertz stress state for two cylinders, and Fig.2 shows the position and dimension of carbides for two of the series of modelled cases.",
journal = "8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia",
title = "Analysis of Hertz contact stresses for metallic material with carbides",
pages = "217-216",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7498"
}

Atanasovska, I.,& Momčilović, D. B.. (2021). Analysis of Hertz contact stresses for metallic material with carbides. in 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia, 216-217.
https://hdl.handle.net/21.15107/rcub_machinery_7498

Atanasovska I, Momčilović DB. Analysis of Hertz contact stresses for metallic material with carbides. in 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia. 2021;:216-217.
https://hdl.handle.net/21.15107/rcub_machinery_7498 .

Atanasovska, Ivana, Momčilović, Dejan B., "Analysis of Hertz contact stresses for metallic material with carbides" in 8th International Congress of Serbian Society of Mechanics, Kragujevac, Serbia (2021):216-217,
https://hdl.handle.net/21.15107/rcub_machinery_7498 .

TY  - CONF
AU  - Vukšić Popović, Marija
AU  - Tanasković, Jovan
AU  - Momčilović, Dejan B.
AU  - Lučanin, Vojkan
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5955
AB  - The coupling system provides a mechanical connection between European railway vehicles. Screw couplings are designed as a safety device in railway vehicles with coupling links and screw as two main components intended to break. Failure of these components is necessary when the load between vehicles is exceeded, otherwise more significant draw gear elements will fracture. The analysis of train break cases shows that the failure of the links occurs only in an approx. 6% of cases. Therefore, the links taken from exploitation after more than 30 years in operation were tested to determine their mechanical characteristics. Tensile testing was performed according to the ISO 6892-1 standard with a continual force and a minimal and maximal test speed prescribed by ISO 6892-1. The values of mechanical characteristics of coupling links are substantially improved during production after heat treatment by hardening and tempering. However, test results of mechanical characteristics didn’t meet all prescribed limits for the minimum requirements according to UIC 826. The current regulations of mechanical characteristics were not in force in time of link production. Examination of the tested links showed a ductile fracture and the cross-sectional area shows the planar stress state.
PB  - Innovation Center of Faculty of Mechanical Engineering
C3  - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2021, The book of Abstract
T1  - Experimental research of mechanical characteristics of railway vehicles safety coupling components
EP  - 32
SP  - 32
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5955
ER  - 

@conference{
author = "Vukšić Popović, Marija and Tanasković, Jovan and Momčilović, Dejan B. and Lučanin, Vojkan",
year = "2021",
abstract = "The coupling system provides a mechanical connection between European railway vehicles. Screw couplings are designed as a safety device in railway vehicles with coupling links and screw as two main components intended to break. Failure of these components is necessary when the load between vehicles is exceeded, otherwise more significant draw gear elements will fracture. The analysis of train break cases shows that the failure of the links occurs only in an approx. 6% of cases. Therefore, the links taken from exploitation after more than 30 years in operation were tested to determine their mechanical characteristics. Tensile testing was performed according to the ISO 6892-1 standard with a continual force and a minimal and maximal test speed prescribed by ISO 6892-1. The values of mechanical characteristics of coupling links are substantially improved during production after heat treatment by hardening and tempering. However, test results of mechanical characteristics didn’t meet all prescribed limits for the minimum requirements according to UIC 826. The current regulations of mechanical characteristics were not in force in time of link production. Examination of the tested links showed a ductile fracture and the cross-sectional area shows the planar stress state.",
publisher = "Innovation Center of Faculty of Mechanical Engineering",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2021, The book of Abstract",
title = "Experimental research of mechanical characteristics of railway vehicles safety coupling components",
pages = "32-32",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5955"
}

Vukšić Popović, M., Tanasković, J., Momčilović, D. B.,& Lučanin, V.. (2021). Experimental research of mechanical characteristics of railway vehicles safety coupling components. in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2021, The book of Abstract
Innovation Center of Faculty of Mechanical Engineering., 32-32.
https://hdl.handle.net/21.15107/rcub_machinery_5955

Vukšić Popović M, Tanasković J, Momčilović DB, Lučanin V. Experimental research of mechanical characteristics of railway vehicles safety coupling components. in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2021, The book of Abstract. 2021;:32-32.
https://hdl.handle.net/21.15107/rcub_machinery_5955 .

Vukšić Popović, Marija, Tanasković, Jovan, Momčilović, Dejan B., Lučanin, Vojkan, "Experimental research of mechanical characteristics of railway vehicles safety coupling components" in International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2021, The book of Abstract (2021):32-32,
https://hdl.handle.net/21.15107/rcub_machinery_5955 .

TY  - CHAP
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan B.
AU  - Mitrović, Radivoje
AU  - Soldat, Nataša D.
AU  - Nesić, N.
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3459
AB  - This paper contains elements of a comprehensive research devoted to the dynamic behavior of radial ball bearings in real working conditions. The general motivation for this topic comes from the requirements for high performance operation of bearings within complex mechanical systems, defined in many industrial branches during the last decades. The discussion of the fundamental postulates of the approach used for analyzing the vibration response of rolling ball bearings in order to select the optimal working conditions is given. The certain simplifications and reductions used for analyzing the radial ball bearings are explained. The developed procedure can be used for research of influence of different damages and variable operation conditions on the rolling bearings dynamics. The detail analyses of the dynamic behavior of rolling bearings are performed for particular types of radial ball bearings in two case studies: For the damaged outer raceway surface in accordance with real fatigue damage shapes and dimensions and, for variable working temperature. Obtained results are shown by comparative diagrams of vibration and phase plane portraits. Presented results could be a base for more widely research of nonlinear dynamics of radial ball bearings with different damages and for the application of phase plane analysis in order to choose the optimal operation conditions.
PB  - Springer
T2  - IUTAM Bookseries
T1  - Nonlinear Dynamics as a Tool in Selection of Working Conditions for Radial Ball Bearing
EP  - 58
SP  - 49
VL  - 37
DO  - 10.1007/978-3-030-23692-2_5
ER  - 

@inbook{
author = "Atanasovska, Ivana and Momčilović, Dejan B. and Mitrović, Radivoje and Soldat, Nataša D. and Nesić, N.",
year = "2020",
abstract = "This paper contains elements of a comprehensive research devoted to the dynamic behavior of radial ball bearings in real working conditions. The general motivation for this topic comes from the requirements for high performance operation of bearings within complex mechanical systems, defined in many industrial branches during the last decades. The discussion of the fundamental postulates of the approach used for analyzing the vibration response of rolling ball bearings in order to select the optimal working conditions is given. The certain simplifications and reductions used for analyzing the radial ball bearings are explained. The developed procedure can be used for research of influence of different damages and variable operation conditions on the rolling bearings dynamics. The detail analyses of the dynamic behavior of rolling bearings are performed for particular types of radial ball bearings in two case studies: For the damaged outer raceway surface in accordance with real fatigue damage shapes and dimensions and, for variable working temperature. Obtained results are shown by comparative diagrams of vibration and phase plane portraits. Presented results could be a base for more widely research of nonlinear dynamics of radial ball bearings with different damages and for the application of phase plane analysis in order to choose the optimal operation conditions.",
publisher = "Springer",
journal = "IUTAM Bookseries",
booktitle = "Nonlinear Dynamics as a Tool in Selection of Working Conditions for Radial Ball Bearing",
pages = "58-49",
volume = "37",
doi = "10.1007/978-3-030-23692-2_5"
}

Atanasovska, I., Momčilović, D. B., Mitrović, R., Soldat, N. D.,& Nesić, N.. (2020). Nonlinear Dynamics as a Tool in Selection of Working Conditions for Radial Ball Bearing. in IUTAM Bookseries
Springer., 37, 49-58.
https://doi.org/10.1007/978-3-030-23692-2_5

Atanasovska I, Momčilović DB, Mitrović R, Soldat ND, Nesić N. Nonlinear Dynamics as a Tool in Selection of Working Conditions for Radial Ball Bearing. in IUTAM Bookseries. 2020;37:49-58.
doi:10.1007/978-3-030-23692-2_5 .

Atanasovska, Ivana, Momčilović, Dejan B., Mitrović, Radivoje, Soldat, Nataša D., Nesić, N., "Nonlinear Dynamics as a Tool in Selection of Working Conditions for Radial Ball Bearing" in IUTAM Bookseries, 37 (2020):49-58,
https://doi.org/10.1007/978-3-030-23692-2_5 . .

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Hedrih, K.R.
AU  - Momčilović, Dejan B.
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7543
AB  - The main performance of involute gears operation leads to the appearance of nonlinear dynamic behavior and impact. In this chapter the influence of mild wear of the tooth flanks of gears without machine finishing and surface hardening on the vibro-impact behavior is considered. For this purpose, a new theoretical model for vibro-impact dynamics of spur gears with mild wear on tooth flanks is developed and described. The developed theoretical model is based on the main postulates of a model of the central centric collision of two fictive rolling disks with radii equal to the radii of kinematic diameters of the pinion and the wheel, as well as on a combined analytical/numerical approach used finite element analysis for the calculation of contact deformations, contact pressure, and wear on tooth flanks surfaces. A particular gear pair for earth moving machine is used for presenting the developed model. The conclusions about the influence of mild wear on the vibroimpact oscillations during running-in period are described.
PB  - Springer Nature
C3  - Nonlinear Dynamics of Structures, Systems and Devices - Proceedings of the 1st International Nonline
T1  - A Theoretical Model for Vibro-Impact Dynamics of Spur Gears with Tooth Flanks Wear
EP  - 136
SP  - 127
DO  - 10.1007/978-3-030-34713-0_13
ER  - 

@conference{
author = "Atanasovska, Ivana and Hedrih, K.R. and Momčilović, Dejan B.",
year = "2020",
abstract = "The main performance of involute gears operation leads to the appearance of nonlinear dynamic behavior and impact. In this chapter the influence of mild wear of the tooth flanks of gears without machine finishing and surface hardening on the vibro-impact behavior is considered. For this purpose, a new theoretical model for vibro-impact dynamics of spur gears with mild wear on tooth flanks is developed and described. The developed theoretical model is based on the main postulates of a model of the central centric collision of two fictive rolling disks with radii equal to the radii of kinematic diameters of the pinion and the wheel, as well as on a combined analytical/numerical approach used finite element analysis for the calculation of contact deformations, contact pressure, and wear on tooth flanks surfaces. A particular gear pair for earth moving machine is used for presenting the developed model. The conclusions about the influence of mild wear on the vibroimpact oscillations during running-in period are described.",
publisher = "Springer Nature",
journal = "Nonlinear Dynamics of Structures, Systems and Devices - Proceedings of the 1st International Nonline",
title = "A Theoretical Model for Vibro-Impact Dynamics of Spur Gears with Tooth Flanks Wear",
pages = "136-127",
doi = "10.1007/978-3-030-34713-0_13"
}

Atanasovska, I., Hedrih, K.R.,& Momčilović, D. B.. (2020). A Theoretical Model for Vibro-Impact Dynamics of Spur Gears with Tooth Flanks Wear. in Nonlinear Dynamics of Structures, Systems and Devices - Proceedings of the 1st International Nonline
Springer Nature., 127-136.
https://doi.org/10.1007/978-3-030-34713-0_13

Atanasovska I, Hedrih K, Momčilović DB. A Theoretical Model for Vibro-Impact Dynamics of Spur Gears with Tooth Flanks Wear. in Nonlinear Dynamics of Structures, Systems and Devices - Proceedings of the 1st International Nonline. 2020;:127-136.
doi:10.1007/978-3-030-34713-0_13 .

Atanasovska, Ivana, Hedrih, K.R., Momčilović, Dejan B., "A Theoretical Model for Vibro-Impact Dynamics of Spur Gears with Tooth Flanks Wear" in Nonlinear Dynamics of Structures, Systems and Devices - Proceedings of the 1st International Nonline (2020):127-136,
https://doi.org/10.1007/978-3-030-34713-0_13 . .

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Mitrović, Radivoje
AU  - Soldat, Nataša
AU  - Momčilović, Dejan B.
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7515
AB  - In the framework of Industry 4.0, new specific or improved methods formonitoring and prediction of operational conditions of machine elements are required.Ball bearings are among the elements with high impact on safety and reliability ofmechanical systems operation. Hence, the development of accurate methods for theirworking conditions monitoring is one of the important tasks within this framework. Inthis paper, the development of 3D Finite Element Model for deep groove ball bearingswith defects on ring races is described in detail and its place in the new monitoringmethods is discussed. Special attention is paid to the modeling of contact finiteelements and selection of FEA parameters for fast and secure convergence duringnon-linear calculations. The stress analysis of contact zones with defects and influenceof variable defect dimensions are presented, also.
C3  - Proceedings of the 5th International Scientific Conference, ”Conference on Mechanical Engineering Technologies and Applications” COMETa2020, East Sarajevo
T1  - Finite element model for stress state analysis of deep groove ball bearings with defects
EP  - 292
SP  - 285
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7515
ER  - 

@conference{
author = "Atanasovska, Ivana and Mitrović, Radivoje and Soldat, Nataša and Momčilović, Dejan B.",
year = "2020",
abstract = "In the framework of Industry 4.0, new specific or improved methods formonitoring and prediction of operational conditions of machine elements are required.Ball bearings are among the elements with high impact on safety and reliability ofmechanical systems operation. Hence, the development of accurate methods for theirworking conditions monitoring is one of the important tasks within this framework. Inthis paper, the development of 3D Finite Element Model for deep groove ball bearingswith defects on ring races is described in detail and its place in the new monitoringmethods is discussed. Special attention is paid to the modeling of contact finiteelements and selection of FEA parameters for fast and secure convergence duringnon-linear calculations. The stress analysis of contact zones with defects and influenceof variable defect dimensions are presented, also.",
journal = "Proceedings of the 5th International Scientific Conference, ”Conference on Mechanical Engineering Technologies and Applications” COMETa2020, East Sarajevo",
title = "Finite element model for stress state analysis of deep groove ball bearings with defects",
pages = "292-285",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7515"
}

Atanasovska, I., Mitrović, R., Soldat, N.,& Momčilović, D. B.. (2020). Finite element model for stress state analysis of deep groove ball bearings with defects. in Proceedings of the 5th International Scientific Conference, ”Conference on Mechanical Engineering Technologies and Applications” COMETa2020, East Sarajevo, 285-292.
https://hdl.handle.net/21.15107/rcub_machinery_7515

Atanasovska I, Mitrović R, Soldat N, Momčilović DB. Finite element model for stress state analysis of deep groove ball bearings with defects. in Proceedings of the 5th International Scientific Conference, ”Conference on Mechanical Engineering Technologies and Applications” COMETa2020, East Sarajevo. 2020;:285-292.
https://hdl.handle.net/21.15107/rcub_machinery_7515 .

Atanasovska, Ivana, Mitrović, Radivoje, Soldat, Nataša, Momčilović, Dejan B., "Finite element model for stress state analysis of deep groove ball bearings with defects" in Proceedings of the 5th International Scientific Conference, ”Conference on Mechanical Engineering Technologies and Applications” COMETa2020, East Sarajevo (2020):285-292,
https://hdl.handle.net/21.15107/rcub_machinery_7515 .

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan B.
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7512
AB  - The safe towing of aircraft is an important part in aviation security. Failures during the towing and parkingrelated operations are not so rare due to bad working circumstance, human error, etc. Tow bars are simplebut very important elements, for towing aircrafts on airports all over the world. This paper describesfailure analysis of accident during towing of regional ATR 72 aircraft. During towing of ATR 72 aircraftsudden fracture of shear pins caused that tow tractor goes into one and airplane ATR 72 into otherdirection. As a result, the airplane crashed on the empty tanker truck and severely deformed nose in thisground damage incident. Design of failed tow bar key elements and of susceptibility to corrosion wasdiscussed in this paper. Failure analysis unveil the several key elements that lead to fracture of shear pins: outdated design of towbar, improper maintenance and non-regular towing of aircraft. Combination of reduction of load capacityof shear pins induced by corrosion and impulse overloading caused premature fracture of the shear pins.and damage of ATR 72 aircraft. As a result of presented analysis the remedy was initiative for detailinspection of existing tow bars and redesign or purchasing the new ones. The results are presented.
C3  - 10th EASN Virtual International Conference on Innovation in Aviation & Space to the Satisfaction of the European Citizens
T1  - Failure analysis of ATR 72 tow bar–opportunity for re-design for inspection
EP  - 76
SP  - 75
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7512
ER  - 

@conference{
author = "Atanasovska, Ivana and Momčilović, Dejan B.",
year = "2020",
abstract = "The safe towing of aircraft is an important part in aviation security. Failures during the towing and parkingrelated operations are not so rare due to bad working circumstance, human error, etc. Tow bars are simplebut very important elements, for towing aircrafts on airports all over the world. This paper describesfailure analysis of accident during towing of regional ATR 72 aircraft. During towing of ATR 72 aircraftsudden fracture of shear pins caused that tow tractor goes into one and airplane ATR 72 into otherdirection. As a result, the airplane crashed on the empty tanker truck and severely deformed nose in thisground damage incident. Design of failed tow bar key elements and of susceptibility to corrosion wasdiscussed in this paper. Failure analysis unveil the several key elements that lead to fracture of shear pins: outdated design of towbar, improper maintenance and non-regular towing of aircraft. Combination of reduction of load capacityof shear pins induced by corrosion and impulse overloading caused premature fracture of the shear pins.and damage of ATR 72 aircraft. As a result of presented analysis the remedy was initiative for detailinspection of existing tow bars and redesign or purchasing the new ones. The results are presented.",
journal = "10th EASN Virtual International Conference on Innovation in Aviation & Space to the Satisfaction of the European Citizens",
title = "Failure analysis of ATR 72 tow bar–opportunity for re-design for inspection",
pages = "76-75",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7512"
}

Atanasovska, I.,& Momčilović, D. B.. (2020). Failure analysis of ATR 72 tow bar–opportunity for re-design for inspection. in 10th EASN Virtual International Conference on Innovation in Aviation & Space to the Satisfaction of the European Citizens, 75-76.
https://hdl.handle.net/21.15107/rcub_machinery_7512

Atanasovska I, Momčilović DB. Failure analysis of ATR 72 tow bar–opportunity for re-design for inspection. in 10th EASN Virtual International Conference on Innovation in Aviation & Space to the Satisfaction of the European Citizens. 2020;:75-76.
https://hdl.handle.net/21.15107/rcub_machinery_7512 .

Atanasovska, Ivana, Momčilović, Dejan B., "Failure analysis of ATR 72 tow bar–opportunity for re-design for inspection" in 10th EASN Virtual International Conference on Innovation in Aviation & Space to the Satisfaction of the European Citizens (2020):75-76,
https://hdl.handle.net/21.15107/rcub_machinery_7512 .

TY  - JOUR
AU  - Bošnjak, Srđan
AU  - Zrnić, Nenad
AU  - Momčilović, Dejan B.
AU  - Gnjatović, Nebojša
AU  - Milenović, Ivan Lj.
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3400
AB  - Tie-rods of the bucket wheel and counterweight booms are vital parts of the bucket wheel excavator slewing superstructure. This paper is dedicated to the problem of identifying the stress state of the critical cross-section ('net section') of the eye plates on these tie-rods. It presents the results of the experimental and numerical investigations carried out on the eyebar model. The results show the appearance of a plastic deformation in the zone near the contour of the hole even when the eye is subjected to the loads within the range of the permissible loads prescribed by the standard DIN 22261-2. Plastification in the eye net section occurs across the full thickness of the plate, but it does not jeopardize the integrity of the structure. The stress value in the eye net section, calculated in accordance with the standard DIN 22261-2, is significantly lower than the actual stress values around the hole and serves only as a comparative value for the static strength proof for the eye.
PB  - Elsevier Sci Ltd, Oxford
T2  - Engineering Structures
T1  - Tie-rods of the bucket wheel excavator slewing superstructure: A study of the eye plate stress state
VL  - 207
DO  - 10.1016/j.engstruct.2020.110233
ER  - 

@article{
author = "Bošnjak, Srđan and Zrnić, Nenad and Momčilović, Dejan B. and Gnjatović, Nebojša and Milenović, Ivan Lj.",
year = "2020",
abstract = "Tie-rods of the bucket wheel and counterweight booms are vital parts of the bucket wheel excavator slewing superstructure. This paper is dedicated to the problem of identifying the stress state of the critical cross-section ('net section') of the eye plates on these tie-rods. It presents the results of the experimental and numerical investigations carried out on the eyebar model. The results show the appearance of a plastic deformation in the zone near the contour of the hole even when the eye is subjected to the loads within the range of the permissible loads prescribed by the standard DIN 22261-2. Plastification in the eye net section occurs across the full thickness of the plate, but it does not jeopardize the integrity of the structure. The stress value in the eye net section, calculated in accordance with the standard DIN 22261-2, is significantly lower than the actual stress values around the hole and serves only as a comparative value for the static strength proof for the eye.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Engineering Structures",
title = "Tie-rods of the bucket wheel excavator slewing superstructure: A study of the eye plate stress state",
volume = "207",
doi = "10.1016/j.engstruct.2020.110233"
}

Bošnjak, S., Zrnić, N., Momčilović, D. B., Gnjatović, N.,& Milenović, I. Lj.. (2020). Tie-rods of the bucket wheel excavator slewing superstructure: A study of the eye plate stress state. in Engineering Structures
Elsevier Sci Ltd, Oxford., 207.
https://doi.org/10.1016/j.engstruct.2020.110233

Bošnjak S, Zrnić N, Momčilović DB, Gnjatović N, Milenović IL. Tie-rods of the bucket wheel excavator slewing superstructure: A study of the eye plate stress state. in Engineering Structures. 2020;207.
doi:10.1016/j.engstruct.2020.110233 .

Bošnjak, Srđan, Zrnić, Nenad, Momčilović, Dejan B., Gnjatović, Nebojša, Milenović, Ivan Lj., "Tie-rods of the bucket wheel excavator slewing superstructure: A study of the eye plate stress state" in Engineering Structures, 207 (2020),
https://doi.org/10.1016/j.engstruct.2020.110233 . .

TY  - JOUR
AU  - Momčilović, Dejan B.
AU  - Odanović, Zoran
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7514
AB  - Turbine and generator rotors and shafts undergo high stresses during regular working lifeand, from a safety and operational aspect, are the most significant components of a powergeneration system. Depending on the appropriate operating conditions, like temperature and/orcorrosion the, shafts can be fabricated out of low/high alloy heat resistance material or of lowalloyed, highly toughened material for different application. Despite known good practice anddeveloped operation procedures, the failures of shafts sometimes occur. The right and well-definedfailure analysis is the basis for feasibility analysis of repair method in the power generating industry.The analysis of direct and indirect costs of repair after the failure analysis as well as the analysis ofthe repair and post-repair conditions of the repaired element is the vital for decision on the keyquestion. Is it possible to repair this element and what is the optimal repair strategy?This paper compares and analyses two approaches, by weldability analysis and weld cyclesimulation, in order to determine welding feasibility analysis of cracked hydro turbine shafts.
T2  - Advanced Materials Research
T1  - Feasibility Analysis for Repair of Large Diameter Hydro Turbine Shaft Based on Weldability Test and Welding Cycle Simulation
EP  - 45
SP  - 36
VL  - 1153
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7514
ER  - 

@article{
author = "Momčilović, Dejan B. and Odanović, Zoran",
year = "2019",
abstract = "Turbine and generator rotors and shafts undergo high stresses during regular working lifeand, from a safety and operational aspect, are the most significant components of a powergeneration system. Depending on the appropriate operating conditions, like temperature and/orcorrosion the, shafts can be fabricated out of low/high alloy heat resistance material or of lowalloyed, highly toughened material for different application. Despite known good practice anddeveloped operation procedures, the failures of shafts sometimes occur. The right and well-definedfailure analysis is the basis for feasibility analysis of repair method in the power generating industry.The analysis of direct and indirect costs of repair after the failure analysis as well as the analysis ofthe repair and post-repair conditions of the repaired element is the vital for decision on the keyquestion. Is it possible to repair this element and what is the optimal repair strategy?This paper compares and analyses two approaches, by weldability analysis and weld cyclesimulation, in order to determine welding feasibility analysis of cracked hydro turbine shafts.",
journal = "Advanced Materials Research",
title = "Feasibility Analysis for Repair of Large Diameter Hydro Turbine Shaft Based on Weldability Test and Welding Cycle Simulation",
pages = "45-36",
volume = "1153",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7514"
}

Momčilović, D. B.,& Odanović, Z.. (2019). Feasibility Analysis for Repair of Large Diameter Hydro Turbine Shaft Based on Weldability Test and Welding Cycle Simulation. in Advanced Materials Research, 1153, 36-45.
https://hdl.handle.net/21.15107/rcub_machinery_7514

Momčilović DB, Odanović Z. Feasibility Analysis for Repair of Large Diameter Hydro Turbine Shaft Based on Weldability Test and Welding Cycle Simulation. in Advanced Materials Research. 2019;1153:36-45.
https://hdl.handle.net/21.15107/rcub_machinery_7514 .

Momčilović, Dejan B., Odanović, Zoran, "Feasibility Analysis for Repair of Large Diameter Hydro Turbine Shaft Based on Weldability Test and Welding Cycle Simulation" in Advanced Materials Research, 1153 (2019):36-45,
https://hdl.handle.net/21.15107/rcub_machinery_7514 .

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan B.
AU  - Vulović, Snežana
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7542
AB  - Major function of railway vehicles absorbers is to absorb energy through controlled deformation during frontal rail vehicle collisions. The results presented and discussed in this paper is a part of the research of one particular type of absorber consist of a thin-walled seamless tube and conical mandrel. The influence of the groove, which occurred during cold worked tube manufacturing, on the behavior and energy absorption of this type of shock absorber is analyzed. The coupled nonlinear Finite Element Analysis is used for calculation of stress-strain state and plastic deformation work/volume of tube absorbers with defects. The results of the research presented in this paper show that the grooves on outer surface of expansion tubes in some cases can be beneficial due to strain hardening process in root of stress concentrator i.e. defect. The beneficial effect of grooves is proven by simulation in which is obvious that the energy absorbed level could be higher on expansion tube with grooves.
C3  - Proceedings of the 7h International Congress of Serbian Society of Mechanics, Sremski Karlovci, Serbia
T1  - The influence of grooves on the behavior of steel tube shock absorbers
EP  - 6
SP  - 1
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7542
ER  - 

@conference{
author = "Atanasovska, Ivana and Momčilović, Dejan B. and Vulović, Snežana",
year = "2019",
abstract = "Major function of railway vehicles absorbers is to absorb energy through controlled deformation during frontal rail vehicle collisions. The results presented and discussed in this paper is a part of the research of one particular type of absorber consist of a thin-walled seamless tube and conical mandrel. The influence of the groove, which occurred during cold worked tube manufacturing, on the behavior and energy absorption of this type of shock absorber is analyzed. The coupled nonlinear Finite Element Analysis is used for calculation of stress-strain state and plastic deformation work/volume of tube absorbers with defects. The results of the research presented in this paper show that the grooves on outer surface of expansion tubes in some cases can be beneficial due to strain hardening process in root of stress concentrator i.e. defect. The beneficial effect of grooves is proven by simulation in which is obvious that the energy absorbed level could be higher on expansion tube with grooves.",
journal = "Proceedings of the 7h International Congress of Serbian Society of Mechanics, Sremski Karlovci, Serbia",
title = "The influence of grooves on the behavior of steel tube shock absorbers",
pages = "6-1",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7542"
}

Atanasovska, I., Momčilović, D. B.,& Vulović, S.. (2019). The influence of grooves on the behavior of steel tube shock absorbers. in Proceedings of the 7h International Congress of Serbian Society of Mechanics, Sremski Karlovci, Serbia, 1-6.
https://hdl.handle.net/21.15107/rcub_machinery_7542

Atanasovska I, Momčilović DB, Vulović S. The influence of grooves on the behavior of steel tube shock absorbers. in Proceedings of the 7h International Congress of Serbian Society of Mechanics, Sremski Karlovci, Serbia. 2019;:1-6.
https://hdl.handle.net/21.15107/rcub_machinery_7542 .

Atanasovska, Ivana, Momčilović, Dejan B., Vulović, Snežana, "The influence of grooves on the behavior of steel tube shock absorbers" in Proceedings of the 7h International Congress of Serbian Society of Mechanics, Sremski Karlovci, Serbia (2019):1-6,
https://hdl.handle.net/21.15107/rcub_machinery_7542 .

TY  - CONF
AU  - Momčilović, Dejan B.
AU  - Atanasovska, Ivana
AU  - Ristić, Ognjen
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7538
AB  - Many new requirements in the field of testing of metals, emphasize traceabilityand accuracy of test results as of the end goal. These requirements have hiddencontext with emphasis on energy efficiency too., which is initiated by massproductions and increasing market of end products based on steels for civil engineeringapplications. The noted above move focus on improvements of existingtest methods. The key point in the verification of improvements is a statisticalanalysis of test results. This paper describes one such analysis, based on resultsobtained by application of new insert tool for testing of shear strength of weldedfabric for civil engineering. This paper presents an extensive series of experimentalresults to verify the efficiency of the application of the new insert tool. The obtainedresults justify applications of a new tool insert to reduce data scatter during testingof welded fabric for civil engineering.
PB  - The Association of Metallurgical Engineers of Serbia, Belgrade, Serbia
C3  - Abstracts of Fourth Metallurgical & Materials Engineering Congress of South-East Europe (MME SEE 2019), Belgrade, Serbia
T1  - Statistical analysis of shear strength of welds in welded fabric for civil engineering with application of new tool design
SP  - 24
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7538
ER  - 

@conference{
author = "Momčilović, Dejan B. and Atanasovska, Ivana and Ristić, Ognjen",
year = "2019",
abstract = "Many new requirements in the field of testing of metals, emphasize traceabilityand accuracy of test results as of the end goal. These requirements have hiddencontext with emphasis on energy efficiency too., which is initiated by massproductions and increasing market of end products based on steels for civil engineeringapplications. The noted above move focus on improvements of existingtest methods. The key point in the verification of improvements is a statisticalanalysis of test results. This paper describes one such analysis, based on resultsobtained by application of new insert tool for testing of shear strength of weldedfabric for civil engineering. This paper presents an extensive series of experimentalresults to verify the efficiency of the application of the new insert tool. The obtainedresults justify applications of a new tool insert to reduce data scatter during testingof welded fabric for civil engineering.",
publisher = "The Association of Metallurgical Engineers of Serbia, Belgrade, Serbia",
journal = "Abstracts of Fourth Metallurgical & Materials Engineering Congress of South-East Europe (MME SEE 2019), Belgrade, Serbia",
title = "Statistical analysis of shear strength of welds in welded fabric for civil engineering with application of new tool design",
pages = "24",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7538"
}

Momčilović, D. B., Atanasovska, I.,& Ristić, O.. (2019). Statistical analysis of shear strength of welds in welded fabric for civil engineering with application of new tool design. in Abstracts of Fourth Metallurgical & Materials Engineering Congress of South-East Europe (MME SEE 2019), Belgrade, Serbia
The Association of Metallurgical Engineers of Serbia, Belgrade, Serbia., 24.
https://hdl.handle.net/21.15107/rcub_machinery_7538

Momčilović DB, Atanasovska I, Ristić O. Statistical analysis of shear strength of welds in welded fabric for civil engineering with application of new tool design. in Abstracts of Fourth Metallurgical & Materials Engineering Congress of South-East Europe (MME SEE 2019), Belgrade, Serbia. 2019;:24.
https://hdl.handle.net/21.15107/rcub_machinery_7538 .

Momčilović, Dejan B., Atanasovska, Ivana, Ristić, Ognjen, "Statistical analysis of shear strength of welds in welded fabric for civil engineering with application of new tool design" in Abstracts of Fourth Metallurgical & Materials Engineering Congress of South-East Europe (MME SEE 2019), Belgrade, Serbia (2019):24,
https://hdl.handle.net/21.15107/rcub_machinery_7538 .

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan B.
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7530
AB  - The aim of the paper is to point up the possibilities of biomimetics principles in the machine elements design. During last decades, the new requirements in machine elements design are placed in front of the experts. The optimization of machine elements is focused on the size reduction, energy efficiency increasing, as well as on the higher reliability. When it is starting to seems that the engineers are without inspiration, the disciplines that returning us to the nature as an inspiration began to occupy the focus. Using biomimetics principles as inspiration, fine optimization of present geometries of machine elements can be done, which will lead to longer and safer life of machines. The good example of solutions offered by nature, with emphasize on design of geometry can be found in the references of few authors dedicated to research in this area. Examples of well-known precise calculations and high "commercial" innovations are found everywhere around us.
PB  - Manipal University Jaipur, India
C3  - Book of abstracts - International Conference on Advances in Mechanical Engineering and Nanotechnology - ICAMEN2019, Jaipur, India
T1  - On biomimetics in machine elements design
SP  - 30
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7530
ER  - 

@conference{
author = "Atanasovska, Ivana and Momčilović, Dejan B.",
year = "2019",
abstract = "The aim of the paper is to point up the possibilities of biomimetics principles in the machine elements design. During last decades, the new requirements in machine elements design are placed in front of the experts. The optimization of machine elements is focused on the size reduction, energy efficiency increasing, as well as on the higher reliability. When it is starting to seems that the engineers are without inspiration, the disciplines that returning us to the nature as an inspiration began to occupy the focus. Using biomimetics principles as inspiration, fine optimization of present geometries of machine elements can be done, which will lead to longer and safer life of machines. The good example of solutions offered by nature, with emphasize on design of geometry can be found in the references of few authors dedicated to research in this area. Examples of well-known precise calculations and high "commercial" innovations are found everywhere around us.",
publisher = "Manipal University Jaipur, India",
journal = "Book of abstracts - International Conference on Advances in Mechanical Engineering and Nanotechnology - ICAMEN2019, Jaipur, India",
title = "On biomimetics in machine elements design",
pages = "30",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7530"
}

Atanasovska, I.,& Momčilović, D. B.. (2019). On biomimetics in machine elements design. in Book of abstracts - International Conference on Advances in Mechanical Engineering and Nanotechnology - ICAMEN2019, Jaipur, India
Manipal University Jaipur, India., 30.
https://hdl.handle.net/21.15107/rcub_machinery_7530

Atanasovska I, Momčilović DB. On biomimetics in machine elements design. in Book of abstracts - International Conference on Advances in Mechanical Engineering and Nanotechnology - ICAMEN2019, Jaipur, India. 2019;:30.
https://hdl.handle.net/21.15107/rcub_machinery_7530 .

Atanasovska, Ivana, Momčilović, Dejan B., "On biomimetics in machine elements design" in Book of abstracts - International Conference on Advances in Mechanical Engineering and Nanotechnology - ICAMEN2019, Jaipur, India (2019):30,
https://hdl.handle.net/21.15107/rcub_machinery_7530 .