Momčilović, Dejan

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Authority KeyName Variants
orcid:: 0000-0001-9728-6022
  • Momčilović, Dejan (80)
Projects
Development of Methodology for Improvement of Operational Performance, Reliability and Energy Efficiency of Machine Systems used in the Resource Industry Dynamics of hybrid systems with complex structures. Mechanics of materials.
Pressure equipment integrity under simultaneous effect of fatigue loading and temperature Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 200029 (Mathematical Institute of SASA, Belgrade)
Sustainability and improvement of mechanical systems in energetic, material handling and conveying by using forensic engineering, environmental and robust design Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 200105 (University of Belgrade, Faculty of Mechanical Engineering)
The effect of nano- and microconstituents on the synthesis and characteristics of novel composite materials with metal matrix Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 200012 (Istitute of Material Testing of Serbia - IMS, Belgrade)
Ministry of Education, Science and Technological Development, Republic of Serbia, Grant no. 200175 (Institute of Technical Sciences of SASA, Belgrade) Istraživanje metoda i pristupa povećanju radnog veka i pouzdanosti mašinskih sistema
Razvoj mašina visokih performansi i metoda za identifikaciju njihovog odziva na unutrašnje i spoljašnje poremećaje Software development for coupled multiphysics problems
Design, development and implementation of the new generation of ADI materials Innovative synergy of by-products, waste minimization and clean technologies in metallurgy
Ministry of Education, Science and Technology of Republic of Serbia

Author's Bibliography

Biomimetics Design of Tooth Root Zone at Cylindrical Gears Profile

Atanasovska, Ivana; Momčilović, Dejan; Lazović, Tatjana; Marinković, Aleksandar; Soldat, Nataša

(2023)

TY  - JOUR
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan
AU  - Lazović, Tatjana
AU  - Marinković, Aleksandar
AU  - Soldat, Nataša
PY  - 2023
UR  - http://rims.institutims.rs/handle/123456789/538
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.
T2  - Biomimetics
T1  - Biomimetics Design of Tooth Root Zone at Cylindrical Gears Profile
IS  - 3
VL  - 8
DO  - 10.3390/biomimetics8030308
ER  - 
@article{
author = "Atanasovska, Ivana and Momčilović, Dejan 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.",
journal = "Biomimetics",
title = "Biomimetics Design of Tooth Root Zone at Cylindrical Gears Profile",
number = "3",
volume = "8",
doi = "10.3390/biomimetics8030308"
}
Atanasovska, I., Momčilović, D., Lazović, T., Marinković, A.,& Soldat, N.. (2023). Biomimetics Design of Tooth Root Zone at Cylindrical Gears Profile. in Biomimetics, 8(3).
https://doi.org/10.3390/biomimetics8030308
Atanasovska I, Momčilović D, Lazović T, Marinković A, Soldat N. Biomimetics Design of Tooth Root Zone at Cylindrical Gears Profile. in Biomimetics. 2023;8(3).
doi:10.3390/biomimetics8030308 .
Atanasovska, Ivana, Momčilović, Dejan, Lazović, Tatjana, Marinković, Aleksandar, Soldat, Nataša, "Biomimetics Design of Tooth Root Zone at Cylindrical Gears Profile" in Biomimetics, 8, no. 3 (2023),
https://doi.org/10.3390/biomimetics8030308 . .
1

Mathematical modeling and experimental investigation of a composite beam failure - Case study

Milić, Milica; Svorcan, Jelena; Zorić, Nemanja; Atanasovska, Ivana; Momčilović, Dejan

(2023)

TY  - CONF
AU  - Milić, Milica
AU  - Svorcan, Jelena
AU  - Zorić, Nemanja
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan
PY  - 2023
UR  - http://rims.institutims.rs/handle/123456789/537
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.
C3  - 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
VL  - 0
DO  - 10.1177/09544062231179078
ER  - 
@conference{
author = "Milić, Milica and Svorcan, Jelena and Zorić, Nemanja and Atanasovska, Ivana and Momčilović, Dejan",
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.",
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",
volume = "0",
doi = "10.1177/09544062231179078"
}
Milić, M., Svorcan, J., Zorić, N., Atanasovska, I.,& Momčilović, D.. (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, 0.
https://doi.org/10.1177/09544062231179078
Milić M, Svorcan J, Zorić N, Atanasovska I, Momčilović D. 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;0.
doi:10.1177/09544062231179078 .
Milić, Milica, Svorcan, Jelena, Zorić, Nemanja, Atanasovska, Ivana, Momčilović, Dejan, "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, 0 (2023),
https://doi.org/10.1177/09544062231179078 . .
1

Life Assessment of Corroded Wire for Prestressing

Momčilović, Dejan; Atanasovska, Ivana; Vulović, Snežana; Pavlović, Ana

(MDPI, 2023)

TY  - JOUR
AU  - Momčilović, Dejan
AU  - Atanasovska, Ivana
AU  - Vulović, Snežana
AU  - Pavlović, Ana
PY  - 2023
UR  - http://rims.institutims.rs/handle/123456789/461
AB  - The repair of structural elements for the prestressing of reinforced concrete is necessary
when existing prestressing wires are damaged or after a certain period of time. The objective of this
paper is to describe the methodology for the life assessment of corroded prestressing wires, sampled
from prestressed concrete elements after a few decades of use. The aim of the presented research was
to determine the real properties of corroded wire in terms of the evaluation of remaining load capacity
using the Theory of Critical Distances (TCD). The methodology also includes spatial 3D characterization
of 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 more
efficient evaluation of repair range and options for the elements of mechanical prestressing systems
within 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 high
applicability 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 of
engineering 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 and Atanasovska, Ivana and Vulović, Snežana and Pavlović, Ana",
year = "2023",
abstract = "The repair of structural elements for the prestressing of reinforced concrete is necessary
when existing prestressing wires are damaged or after a certain period of time. The objective of this
paper is to describe the methodology for the life assessment of corroded prestressing wires, sampled
from prestressed concrete elements after a few decades of use. The aim of the presented research was
to determine the real properties of corroded wire in terms of the evaluation of remaining load capacity
using the Theory of Critical Distances (TCD). The methodology also includes spatial 3D characterization
of 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 more
efficient evaluation of repair range and options for the elements of mechanical prestressing systems
within 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 high
applicability 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 of
engineering 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., 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 D, Atanasovska I, Vulović S, Pavlović A. Life Assessment of Corroded Wire for Prestressing. in Metals. 2023;13(2).
doi:10.3390/met13020387 .
Momčilović, Dejan, 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 . .
1

Failure analysis of beam of unmanned aerial vehicle

Milić, Milica; Atanasovska, Ivana; Ristić, Ognjen; Momčilović, Dejan

(University of Belgrade - Faculty of Mechanical Engineering, Belgrade, Serbia, 2022)

TY  - CONF
AU  - Milić, Milica
AU  - Atanasovska, Ivana
AU  - Ristić, Ognjen
AU  - Momčilović, Dejan
PY  - 2022
UR  - http://rims.institutims.rs/handle/123456789/481
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_rims_481
ER  - 
@conference{
author = "Milić, Milica and Atanasovska, Ivana and Ristić, Ognjen and Momčilović, Dejan",
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_rims_481"
}
Milić, M., Atanasovska, I., Ristić, O.,& Momčilović, D.. (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_rims_481
Milić M, Atanasovska I, Ristić O, Momčilović D. 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_rims_481 .
Milić, Milica, Atanasovska, Ivana, Ristić, Ognjen, Momčilović, Dejan, "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_rims_481 .

Neural network model for the condition assessment of hydro turbines

Ilić, Dragoljub; Milošević, Dragan; Momčilović, Dejan

(University of Belgrade - Faculty of Mechanical Engineering, Belgrade, Serbia, 2022)

TY  - CONF
AU  - Ilić, Dragoljub
AU  - Milošević, Dragan
AU  - Momčilović, Dejan
PY  - 2022
UR  - http://rims.institutims.rs/handle/123456789/480
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_rims_480
ER  - 
@conference{
author = "Ilić, Dragoljub and Milošević, Dragan and Momčilović, Dejan",
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_rims_480"
}
Ilić, D., Milošević, D.,& Momčilović, D.. (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_rims_480
Ilić D, Milošević D, Momčilović D. 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_rims_480 .
Ilić, Dragoljub, Milošević, Dragan, Momčilović, Dejan, "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_rims_480 .

Examination of the physical-chemical and mechanical properties of helical cylindrical compression springs preserved in the Legacy in the Nikola Tesla Museum

Stojiljković, Bratislav; Momčilović, Dejan

(University of Belgrade - Faculty of Mechanical Engineering, Belgrade, Serbia, 2022)

TY  - CONF
AU  - Stojiljković, Bratislav
AU  - Momčilović, Dejan
PY  - 2022
UR  - http://rims.institutims.rs/handle/123456789/479
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_rims_479
ER  - 
@conference{
author = "Stojiljković, Bratislav and Momčilović, Dejan",
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_rims_479"
}
Stojiljković, B.,& Momčilović, D.. (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_rims_479
Stojiljković B, Momčilović D. 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_rims_479 .
Stojiljković, Bratislav, Momčilović, Dejan, "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_rims_479 .

Analysis of contact fatigue coupled with geometry and material nonlinearities by Theory of critical distances

Atanasovska, Ivana; Momčilović, Dejan

(2022)

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan
PY  - 2022
UR  - http://rims.institutims.rs/handle/123456789/458
AB  - The contact fatigue is a localized phenomenon that occurs in highly
stressed local zone of the material under the loaded contact region and as such is
highly nonlinear problem. This phenomenon exists in almost all real mechanical
systems with contact strains coupled with other sources of nonlinear behaviour.
The improvements of existing procedures and methods for standard calculation
of contact fatigue have a potential to give significant contribution to increase
accuracy of calculation of life assessment, reliability and efficiency of complex
mechanical systems. This paper gives the basic explanation of the Theory of
critical distances and its application on direct estimation of fatigue crack
initiation in contact zones. Analysis of contact fatigue when the contact zones
are subjected to additional nonlinearities such as geometry manufacturing
deviations, geometry microscale-damages or nonlinear material characteristics
are presented in detail. Few different real multi-nonlinear problems are used for
analysis performing. The benefits of presented approach are discussed by detail
analysis of the obtained results, and could be based on the increasing accuracy
of contact fatigue prediction considering all existing nonlinearities in loaded
contact 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_rims_458
ER  - 
@conference{
author = "Atanasovska, Ivana and Momčilović, Dejan",
year = "2022",
abstract = "The contact fatigue is a localized phenomenon that occurs in highly
stressed local zone of the material under the loaded contact region and as such is
highly nonlinear problem. This phenomenon exists in almost all real mechanical
systems with contact strains coupled with other sources of nonlinear behaviour.
The improvements of existing procedures and methods for standard calculation
of contact fatigue have a potential to give significant contribution to increase
accuracy of calculation of life assessment, reliability and efficiency of complex
mechanical systems. This paper gives the basic explanation of the Theory of
critical distances and its application on direct estimation of fatigue crack
initiation in contact zones. Analysis of contact fatigue when the contact zones
are subjected to additional nonlinearities such as geometry manufacturing
deviations, geometry microscale-damages or nonlinear material characteristics
are presented in detail. Few different real multi-nonlinear problems are used for
analysis performing. The benefits of presented approach are discussed by detail
analysis of the obtained results, and could be based on the increasing accuracy
of contact fatigue prediction considering all existing nonlinearities in loaded
contact 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_rims_458"
}
Atanasovska, I.,& Momčilović, D.. (2022). 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_rims_458
Atanasovska I, Momčilović D. Analysis of contact fatigue coupled with geometry and material nonlinearities by Theory of critical distances. in 2nd Conference on Nonlinearity, Belgrade. 2022;:27-47.
https://hdl.handle.net/21.15107/rcub_rims_458 .
Atanasovska, Ivana, Momčilović, Dejan, "Analysis of contact fatigue coupled with geometry and material nonlinearities by Theory of critical distances" in 2nd Conference on Nonlinearity, Belgrade (2022):27-47,
https://hdl.handle.net/21.15107/rcub_rims_458 .

Analysis of Hertz contact stresses for metallic material with carbides

Atanasovska, Ivana; Momčilović, Dejan

(2021)

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan
PY  - 2021
UR  - http://rims.institutims.rs/handle/123456789/478
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_rims_478
ER  - 
@conference{
author = "Atanasovska, Ivana and Momčilović, Dejan",
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_rims_478"
}
Atanasovska, I.,& Momčilović, D.. (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_rims_478
Atanasovska I, Momčilović D. 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_rims_478 .
Atanasovska, Ivana, Momčilović, Dejan, "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_rims_478 .

Geometric optimization of shaft transition zone based on stress-strain analysis of nature inspired design

Atanasovska, Ivana; Momčilović, Dejan

(2021)

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan
PY  - 2021
UR  - http://rims.institutims.rs/handle/123456789/459
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_rims_459
ER  - 
@conference{
author = "Atanasovska, Ivana and Momčilović, Dejan",
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_rims_459"
}
Atanasovska, I.,& Momčilović, D.. (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_rims_459
Atanasovska I, Momčilović D. 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_rims_459 .
Atanasovska, Ivana, Momčilović, Dejan, "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_rims_459 .

Geometric optimization of transition zones based on biomimetics principles

Atanasovska, Ivana; Momčilović, Dejan

(2021)

TY  - JOUR
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan
PY  - 2021
UR  - http://rims.institutims.rs/handle/123456789/457
AB  - The basic definitions and a history of the development of biomimetics as a discipline that
considers nature-inspired design are presented in this paper. The discussion and the results of the
application of principles of nature-inspired design in machine elements design are given. The fact
that transition zones that Nature chose and designed on trees in many cases survived for more
than a hundred years, resisting on the various and variable external loads and other external
conditions, is considered. Presented case study used the nature-inspired transition shapes in the
research of innovative design and geometric optimization of transition zones of high-loaded
shafts. The comparative Finite Element Analysis is performed for a particular transition zone with
traditional engineering design, as well as with nature-inspired design. The conclusions about the
increase 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",
year = "2021",
abstract = "The basic definitions and a history of the development of biomimetics as a discipline that
considers nature-inspired design are presented in this paper. The discussion and the results of the
application of principles of nature-inspired design in machine elements design are given. The fact
that transition zones that Nature chose and designed on trees in many cases survived for more
than a hundred years, resisting on the various and variable external loads and other external
conditions, is considered. Presented case study used the nature-inspired transition shapes in the
research of innovative design and geometric optimization of transition zones of high-loaded
shafts. The comparative Finite Element Analysis is performed for a particular transition zone with
traditional engineering design, as well as with nature-inspired design. The conclusions about the
increase 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.. (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 D. 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, "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 . .
2

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

Mitrašinović, Aleksandar M.; Momčilović, Dejan; Odanović, Zoran

(Springer India, New Delhi, 2021)

TY  - JOUR
AU  - Mitrašinović, Aleksandar M.
AU  - Momčilović, Dejan
AU  - Odanović, Zoran
PY  - 2021
UR  - http://rims.institutims.rs/handle/123456789/412
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 and Odanović, Zoran",
year = "2021",
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.,& Odanović, Z.. (2021). 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 D, 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. 2021;74(8):1917-1922.
doi:10.1007/s12666-021-02279-6 .
Mitrašinović, Aleksandar M., Momčilović, Dejan, 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 (2021):1917-1922,
https://doi.org/10.1007/s12666-021-02279-6 . .
1

Unapređenje tehnologije aluminotermijskog zavarivanja železničkih šina različitog poprečnog preseka

Manojlović, Vaso; Kamberović, Željko; Sokić, Miroslav; Momčilović, Dejan; Gavrilovski, Milorad

(2021)

TY  - JOUR
AU  - Manojlović, Vaso
AU  - Kamberović, Željko
AU  - Sokić, Miroslav
AU  - Momčilović, Dejan
AU  - Gavrilovski, Milorad
PY  - 2021
UR  - http://rims.institutims.rs/handle/123456789/455
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.
T2  - Tehnika 76(6)
T1  - Unapređenje tehnologije aluminotermijskog zavarivanja železničkih šina različitog poprečnog preseka
EP  - 761
SP  - 756
DO  - 10.5937/tehnika2106756M
ER  - 
@article{
author = "Manojlović, Vaso and Kamberović, Željko and Sokić, Miroslav and Momčilović, Dejan 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.",
journal = "Tehnika 76(6)",
title = "Unapređenje tehnologije aluminotermijskog zavarivanja železničkih šina različitog poprečnog preseka",
pages = "761-756",
doi = "10.5937/tehnika2106756M"
}
Manojlović, V., Kamberović, Ž., Sokić, M., Momčilović, D.,& Gavrilovski, M.. (2021). Unapređenje tehnologije aluminotermijskog zavarivanja železničkih šina različitog poprečnog preseka. in Tehnika 76(6), 756-761.
https://doi.org/10.5937/tehnika2106756M
Manojlović V, Kamberović Ž, Sokić M, Momčilović D, Gavrilovski M. Unapređenje tehnologije aluminotermijskog zavarivanja železničkih šina različitog poprečnog preseka. in Tehnika 76(6). 2021;:756-761.
doi:10.5937/tehnika2106756M .
Manojlović, Vaso, Kamberović, Željko, Sokić, Miroslav, Momčilović, Dejan, Gavrilovski, Milorad, "Unapređenje tehnologije aluminotermijskog zavarivanja železničkih šina različitog poprečnog preseka" in Tehnika 76(6) (2021):756-761,
https://doi.org/10.5937/tehnika2106756M . .

Experimental research of mechanical characteristics of railway vehicles safety coupling components

Vukšić-Popović, Marija; Tanasković, Jovan; Momčilović, Dejan; Lučanin, Vojkan

(2021)

TY  - CONF
AU  - Vukšić-Popović, Marija
AU  - Tanasković, Jovan
AU  - Momčilović, Dejan
AU  - Lučanin, Vojkan
PY  - 2021
UR  - http://rims.institutims.rs/handle/123456789/476
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.
C3  - International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2021, Zlatibor, Serbia
T1  - Experimental research of mechanical characteristics of railway vehicles safety coupling components
SP  - 32
UR  - https://hdl.handle.net/21.15107/rcub_rims_476
ER  - 
@conference{
author = "Vukšić-Popović, Marija and Tanasković, Jovan and Momčilović, Dejan 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.",
journal = "International Conference of Experimental and Numerical Investigations and New Technologies CNN TECH 2021, Zlatibor, Serbia",
title = "Experimental research of mechanical characteristics of railway vehicles safety coupling components",
pages = "32",
url = "https://hdl.handle.net/21.15107/rcub_rims_476"
}
Vukšić-Popović, M., Tanasković, J., Momčilović, D.,& 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, Zlatibor, Serbia, 32.
https://hdl.handle.net/21.15107/rcub_rims_476
Vukšić-Popović M, Tanasković J, Momčilović D, 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, Zlatibor, Serbia. 2021;:32.
https://hdl.handle.net/21.15107/rcub_rims_476 .
Vukšić-Popović, Marija, Tanasković, Jovan, Momčilović, Dejan, 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, Zlatibor, Serbia (2021):32,
https://hdl.handle.net/21.15107/rcub_rims_476 .

Unapređenje tehnologije aluminotermijskog zavarivanja železničkih šina različitog poprečnog preseka

Manojlović, Vaso D.; Kamberović, Željko J.; Sokić, Miroslav D.; Momčilović, Dejan; Gavrilovski, Milorad

(Savez inženjera i tehničara Srbije, Beograd, 2021)

TY  - JOUR
AU  - Manojlović, Vaso D.
AU  - Kamberović, Željko J.
AU  - Sokić, Miroslav D.
AU  - Momčilović, Dejan
AU  - Gavrilovski, Milorad
PY  - 2021
UR  - http://rims.institutims.rs/handle/123456789/407
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 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.,& 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 D, 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, 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 . .

Finite element model for stress state analysis of deep groove ball bearings with defects

Atanasovska, Ivana; Mitrović, Radivoje; Soldat, Nataša; Momčilović, Dejan

(2020)

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Mitrović, Radivoje
AU  - Soldat, Nataša
AU  - Momčilović, Dejan
PY  - 2020
UR  - http://rims.institutims.rs/handle/123456789/460
AB  - In the framework of Industry 4.0, new specific or improved methods for
monitoring and prediction of operational conditions of machine elements are required.
Ball bearings are among the elements with high impact on safety and reliability of
mechanical systems operation. Hence, the development of accurate methods for their
working conditions monitoring is one of the important tasks within this framework. In
this paper, the development of 3D Finite Element Model for deep groove ball bearings
with defects on ring races is described in detail and its place in the new monitoring
methods is discussed. Special attention is paid to the modeling of contact finite
elements and selection of FEA parameters for fast and secure convergence during
non-linear calculations. The stress analysis of contact zones with defects and influence
of 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_rims_460
ER  - 
@conference{
author = "Atanasovska, Ivana and Mitrović, Radivoje and Soldat, Nataša and Momčilović, Dejan",
year = "2020",
abstract = "In the framework of Industry 4.0, new specific or improved methods for
monitoring and prediction of operational conditions of machine elements are required.
Ball bearings are among the elements with high impact on safety and reliability of
mechanical systems operation. Hence, the development of accurate methods for their
working conditions monitoring is one of the important tasks within this framework. In
this paper, the development of 3D Finite Element Model for deep groove ball bearings
with defects on ring races is described in detail and its place in the new monitoring
methods is discussed. Special attention is paid to the modeling of contact finite
elements and selection of FEA parameters for fast and secure convergence during
non-linear calculations. The stress analysis of contact zones with defects and influence
of 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_rims_460"
}
Atanasovska, I., Mitrović, R., Soldat, N.,& Momčilović, D.. (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_rims_460
Atanasovska I, Mitrović R, Soldat N, Momčilović D. 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_rims_460 .
Atanasovska, Ivana, Mitrović, Radivoje, Soldat, Nataša, Momčilović, Dejan, "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_rims_460 .

Failure analysis of ATR 72 tow bar–opportunity for re-design for inspection

Atanasovska, Ivana; Momčilović, Dejan

(2020)

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan
PY  - 2020
UR  - http://rims.institutims.rs/handle/123456789/477
AB  - The safe towing of aircraft is an important part in aviation security. Failures during the towing and parking
related operations are not so rare due to bad working circumstance, human error, etc. Tow bars are simple
but very important elements, for towing aircrafts on airports all over the world. This paper describes
failure analysis of accident during towing of regional ATR 72 aircraft. During towing of ATR 72 aircraft
sudden fracture of shear pins caused that tow tractor goes into one and airplane ATR 72 into other
direction. As a result, the airplane crashed on the empty tanker truck and severely deformed nose in this
ground damage incident. Design of failed tow bar key elements and of susceptibility to corrosion was
discussed in this paper. Failure analysis unveil the several key elements that lead to fracture of shear pins: outdated design of tow
bar, improper maintenance and non-regular towing of aircraft. Combination of reduction of load capacity
of 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 detail
inspection 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_rims_477
ER  - 
@conference{
author = "Atanasovska, Ivana and Momčilović, Dejan",
year = "2020",
abstract = "The safe towing of aircraft is an important part in aviation security. Failures during the towing and parking
related operations are not so rare due to bad working circumstance, human error, etc. Tow bars are simple
but very important elements, for towing aircrafts on airports all over the world. This paper describes
failure analysis of accident during towing of regional ATR 72 aircraft. During towing of ATR 72 aircraft
sudden fracture of shear pins caused that tow tractor goes into one and airplane ATR 72 into other
direction. As a result, the airplane crashed on the empty tanker truck and severely deformed nose in this
ground damage incident. Design of failed tow bar key elements and of susceptibility to corrosion was
discussed in this paper. Failure analysis unveil the several key elements that lead to fracture of shear pins: outdated design of tow
bar, improper maintenance and non-regular towing of aircraft. Combination of reduction of load capacity
of 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 detail
inspection 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_rims_477"
}
Atanasovska, I.,& Momčilović, D.. (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_rims_477
Atanasovska I, Momčilović D. 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_rims_477 .
Atanasovska, Ivana, Momčilović, Dejan, "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_rims_477 .

Nonlinear Dynamics as a Tool in Selection of Working Conditions for Radial Ball Bearing

Atanasovska, Ivana; Momčilović, Dejan; Mitrović, Radivoje; Soldat, Nataša D.; Nešić, N.

(Springer, 2020)

TY  - CHAP
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan
AU  - Mitrović, Radivoje
AU  - Soldat, Nataša D.
AU  - Nešić, N.
PY  - 2020
UR  - http://rims.institutims.rs/handle/123456789/379
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 and Mitrović, Radivoje and Soldat, Nataša D. and Nešić, 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., Mitrović, R., Soldat, N. D.,& Nešić, 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 D, Mitrović R, Soldat ND, Nešić 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, Mitrović, Radivoje, Soldat, Nataša D., Nešić, 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 . .
2
2

Tie-rods of the bucket wheel excavator slewing superstructure: A study of the eye plate stress state

Bošnjak, Srđan; Zrnić, Nenad; Momčilović, Dejan; Gnjatović, Nebojša; Milenović, Ivan Lj.

(Elsevier Sci Ltd, Oxford, 2020)

TY  - JOUR
AU  - Bošnjak, Srđan
AU  - Zrnić, Nenad
AU  - Momčilović, Dejan
AU  - Gnjatović, Nebojša
AU  - Milenović, Ivan Lj.
PY  - 2020
UR  - http://rims.institutims.rs/handle/123456789/391
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 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., 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 D, 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, 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 . .

Bucket wheel excavators_Dynamic response as a criterion for validation of the total number of buckets

Bošnjak, Srđan; Zrnić, Nenad; Momčilović, Dejan; Gnjatović, Nebojša; Milenović, Ivan

(2020)

TY  - JOUR
AU  - Bošnjak, Srđan
AU  - Zrnić, Nenad
AU  - Momčilović, Dejan
AU  - Gnjatović, Nebojša
AU  - Milenović, Ivan
PY  - 2020
UR  - http://rims.institutims.rs/handle/123456789/451
AB  - An original method for validation of the number of buckets on the working device of a bucket wheel excavator based on the dynamic response of its slewing superstructure (SS) is presented. A set of 16 seemingly acceptable solutions which satisfied the rigid design restrictions, based on the preservation of the existing (a) bucket wheel drivetrain, (b) theoretical capacity, (c) characteristics of the excavated soil and (d) position of the superstructure centre of gravity (CoG), was analysed. Already on the basis of the limiting vertical and lateral accelerations of the bucket wheel centre, which represents a well-grounded indicator of its dynamic behaviour prescribed by the code
DIN 22261-2, 14 out of 16 analysed design variants have been discarded, reducing the set of possible solutions to only two – the originally-designed variant (with 17 buckets), and the variant with 20 buckets. Conclusions on the validity of these two design variants were derived on the basis of the dynamic response analysis of the referent points of the SS. The analysis of the impact of soiling on the dynamic response of the SS has shown that negative dynamic effects, observed in the preceding analysis of the originally-designed solution, increase with the amount
of the adhered material. Although the redesigned variant with 20 buckets has proven as the only suitable solution from the standpoint of dynamic behaviour of the SS, the results have to be assessed carefully due to the fact that the reduction of the mass of the bucket wheel steel structure by more than 14% leads to the appearance of unfavourable dynamic effects, even though the SS CoG position is preserved.
T2  - Engineering Structures
T1  - Bucket wheel excavators_Dynamic response as a criterion for validation of the total number of buckets
VL  - 207
DO  - 10.1016/j.engstruct.2020.110233
ER  - 
@article{
author = "Bošnjak, Srđan and Zrnić, Nenad and Momčilović, Dejan and Gnjatović, Nebojša and Milenović, Ivan",
year = "2020",
abstract = "An original method for validation of the number of buckets on the working device of a bucket wheel excavator based on the dynamic response of its slewing superstructure (SS) is presented. A set of 16 seemingly acceptable solutions which satisfied the rigid design restrictions, based on the preservation of the existing (a) bucket wheel drivetrain, (b) theoretical capacity, (c) characteristics of the excavated soil and (d) position of the superstructure centre of gravity (CoG), was analysed. Already on the basis of the limiting vertical and lateral accelerations of the bucket wheel centre, which represents a well-grounded indicator of its dynamic behaviour prescribed by the code
DIN 22261-2, 14 out of 16 analysed design variants have been discarded, reducing the set of possible solutions to only two – the originally-designed variant (with 17 buckets), and the variant with 20 buckets. Conclusions on the validity of these two design variants were derived on the basis of the dynamic response analysis of the referent points of the SS. The analysis of the impact of soiling on the dynamic response of the SS has shown that negative dynamic effects, observed in the preceding analysis of the originally-designed solution, increase with the amount
of the adhered material. Although the redesigned variant with 20 buckets has proven as the only suitable solution from the standpoint of dynamic behaviour of the SS, the results have to be assessed carefully due to the fact that the reduction of the mass of the bucket wheel steel structure by more than 14% leads to the appearance of unfavourable dynamic effects, even though the SS CoG position is preserved.",
journal = "Engineering Structures",
title = "Bucket wheel excavators_Dynamic response as a criterion for validation of the total number of buckets",
volume = "207",
doi = "10.1016/j.engstruct.2020.110233"
}
Bošnjak, S., Zrnić, N., Momčilović, D., Gnjatović, N.,& Milenović, I.. (2020). Bucket wheel excavators_Dynamic response as a criterion for validation of the total number of buckets. in Engineering Structures, 207.
https://doi.org/10.1016/j.engstruct.2020.110233
Bošnjak S, Zrnić N, Momčilović D, Gnjatović N, Milenović I. Bucket wheel excavators_Dynamic response as a criterion for validation of the total number of buckets. in Engineering Structures. 2020;207.
doi:10.1016/j.engstruct.2020.110233 .
Bošnjak, Srđan, Zrnić, Nenad, Momčilović, Dejan, Gnjatović, Nebojša, Milenović, Ivan, "Bucket wheel excavators_Dynamic response as a criterion for validation of the total number of buckets" in Engineering Structures, 207 (2020),
https://doi.org/10.1016/j.engstruct.2020.110233 . .

A Theoretical Model for Vibro-Impact Dynamics of Spur Gears with Tooth Flanks Wear

Atanasovska, Ivana; Hedrih, K.R.; Momčilović, Dejan

(Springer Nature, 2020)

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Hedrih, K.R.
AU  - Momčilović, Dejan
PY  - 2020
UR  - http://rims.institutims.rs/handle/123456789/394
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",
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.. (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 D. 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, "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 . .

Statistical analysis of shear strength of welds in welded fabric for civil engineering with application of new tool design

Momčilović, Dejan; Atanasovska, Ivana; Ristić, Ognjen

(The Association of Metallurgical Engineers of Serbia, Belgrade, Serbia, 2019)

TY  - CONF
AU  - Momčilović, Dejan
AU  - Atanasovska, Ivana
AU  - Ristić, Ognjen
PY  - 2019
UR  - http://rims.institutims.rs/handle/123456789/484
AB  - Many new requirements in the field of testing of metals, emphasize traceability
and accuracy of test results as of the end goal. These requirements have hidden
context with emphasis on energy efficiency too., which is initiated by mass
productions and increasing market of end products based on steels for civil engineering
applications. The noted above move focus on improvements of existing
test methods. The key point in the verification of improvements is a statistical
analysis of test results. This paper describes one such analysis, based on results
obtained by application of new insert tool for testing of shear strength of welded
fabric for civil engineering. This paper presents an extensive series of experimental
results to verify the efficiency of the application of the new insert tool. The obtained
results justify applications of a new tool insert to reduce data scatter during testing
of 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_rims_484
ER  - 
@conference{
author = "Momčilović, Dejan and Atanasovska, Ivana and Ristić, Ognjen",
year = "2019",
abstract = "Many new requirements in the field of testing of metals, emphasize traceability
and accuracy of test results as of the end goal. These requirements have hidden
context with emphasis on energy efficiency too., which is initiated by mass
productions and increasing market of end products based on steels for civil engineering
applications. The noted above move focus on improvements of existing
test methods. The key point in the verification of improvements is a statistical
analysis of test results. This paper describes one such analysis, based on results
obtained by application of new insert tool for testing of shear strength of welded
fabric for civil engineering. This paper presents an extensive series of experimental
results to verify the efficiency of the application of the new insert tool. The obtained
results justify applications of a new tool insert to reduce data scatter during testing
of 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_rims_484"
}
Momčilović, D., 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_rims_484
Momčilović D, 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_rims_484 .
Momčilović, Dejan, 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_rims_484 .

Alatni uložak za sprečavanje rotacije poprečne žice pri ispitivanju zavarenih spojeva čeličnih spojeva mreža na smicanje

Atanasovska, Ivana; Momčilović, Dejan; Timotijević, Dejan; Ristić, Ognjen

(2019)

TY  - PAT
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan
AU  - Timotijević, Dejan
AU  - Ristić, Ognjen
PY  - 2019
UR  - http://rims.institutims.rs/handle/123456789/482
T1  - Alatni uložak za sprečavanje rotacije poprečne žice pri ispitivanju zavarenih spojeva čeličnih spojeva mreža na smicanje
UR  - https://hdl.handle.net/21.15107/rcub_rims_482
ER  - 
@misc{
author = "Atanasovska, Ivana and Momčilović, Dejan and Timotijević, Dejan and Ristić, Ognjen",
year = "2019",
title = "Alatni uložak za sprečavanje rotacije poprečne žice pri ispitivanju zavarenih spojeva čeličnih spojeva mreža na smicanje",
url = "https://hdl.handle.net/21.15107/rcub_rims_482"
}
Atanasovska, I., Momčilović, D., Timotijević, D.,& Ristić, O.. (2019). Alatni uložak za sprečavanje rotacije poprečne žice pri ispitivanju zavarenih spojeva čeličnih spojeva mreža na smicanje. .
https://hdl.handle.net/21.15107/rcub_rims_482
Atanasovska I, Momčilović D, Timotijević D, Ristić O. Alatni uložak za sprečavanje rotacije poprečne žice pri ispitivanju zavarenih spojeva čeličnih spojeva mreža na smicanje. 2019;.
https://hdl.handle.net/21.15107/rcub_rims_482 .
Atanasovska, Ivana, Momčilović, Dejan, Timotijević, Dejan, Ristić, Ognjen, "Alatni uložak za sprečavanje rotacije poprečne žice pri ispitivanju zavarenih spojeva čeličnih spojeva mreža na smicanje" (2019),
https://hdl.handle.net/21.15107/rcub_rims_482 .

Great persons and results make biomimetics incredibly inspirational

Atanasovska, Ivana; Momčilović, Dejan

(2019)

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan
PY  - 2019
UR  - http://rims.institutims.rs/handle/123456789/471
AB  - The concept of using ideas from nature as inspiration for innovation and technological development is in focus last decades, while the similar approach can be found in the ancient civilizations. In any kind of such progress it is important to remember the founders and pioneers and to understand their character and the circumstances that push them to go beyond existing knowledge.
C3  - Abstracts of 15th International conference Dynamical Systems - Theory and Applications
T1  - Great persons and results make biomimetics incredibly inspirational
UR  - https://hdl.handle.net/21.15107/rcub_rims_471
ER  - 
@conference{
author = "Atanasovska, Ivana and Momčilović, Dejan",
year = "2019",
abstract = "The concept of using ideas from nature as inspiration for innovation and technological development is in focus last decades, while the similar approach can be found in the ancient civilizations. In any kind of such progress it is important to remember the founders and pioneers and to understand their character and the circumstances that push them to go beyond existing knowledge.",
journal = "Abstracts of 15th International conference Dynamical Systems - Theory and Applications",
title = "Great persons and results make biomimetics incredibly inspirational",
url = "https://hdl.handle.net/21.15107/rcub_rims_471"
}
Atanasovska, I.,& Momčilović, D.. (2019). Great persons and results make biomimetics incredibly inspirational. in Abstracts of 15th International conference Dynamical Systems - Theory and Applications.
https://hdl.handle.net/21.15107/rcub_rims_471
Atanasovska I, Momčilović D. Great persons and results make biomimetics incredibly inspirational. in Abstracts of 15th International conference Dynamical Systems - Theory and Applications. 2019;.
https://hdl.handle.net/21.15107/rcub_rims_471 .
Atanasovska, Ivana, Momčilović, Dejan, "Great persons and results make biomimetics incredibly inspirational" in Abstracts of 15th International conference Dynamical Systems - Theory and Applications (2019),
https://hdl.handle.net/21.15107/rcub_rims_471 .

A theoretical model for vibro-impact dynamics of spur gears with tooth flanks wear

Atanasovska, Ivana; Hedrih (Stevanović), Katica; Momčilović, Dejan

(NODYS Publications, Rome, Italy, 2019)

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Hedrih (Stevanović), Katica
AU  - Momčilović, Dejan
PY  - 2019
UR  - http://rims.institutims.rs/handle/123456789/475
AB  - The main performances of involute gears operations lead to the appearance of nonlinear dynamic behaviour and impact. In this paper the influence of mild wear of the tooth flanks of gears without surface hardening on the vibro-impact behaviour 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 – Finite Element method for calculation the contact deformations, contact pressure and wear on tooth flanks surfaces. A particular gear pair is used for presentation of the developed model.
PB  - NODYS Publications, Rome, Italy
C3  - Book of abstracts –The First International Nonlinear Dynamics Conference-NODYCON2019, Rome, Italia
T1  - A theoretical model for vibro-impact dynamics of spur gears with tooth flanks wear
EP  - 38
SP  - 37
UR  - https://hdl.handle.net/21.15107/rcub_rims_475
ER  - 
@conference{
author = "Atanasovska, Ivana and Hedrih (Stevanović), Katica and Momčilović, Dejan",
year = "2019",
abstract = "The main performances of involute gears operations lead to the appearance of nonlinear dynamic behaviour and impact. In this paper the influence of mild wear of the tooth flanks of gears without surface hardening on the vibro-impact behaviour 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 – Finite Element method for calculation the contact deformations, contact pressure and wear on tooth flanks surfaces. A particular gear pair is used for presentation of the developed model.",
publisher = "NODYS Publications, Rome, Italy",
journal = "Book of abstracts –The First International Nonlinear Dynamics Conference-NODYCON2019, Rome, Italia",
title = "A theoretical model for vibro-impact dynamics of spur gears with tooth flanks wear",
pages = "38-37",
url = "https://hdl.handle.net/21.15107/rcub_rims_475"
}
Atanasovska, I., Hedrih (Stevanović), K.,& Momčilović, D.. (2019). A theoretical model for vibro-impact dynamics of spur gears with tooth flanks wear. in Book of abstracts –The First International Nonlinear Dynamics Conference-NODYCON2019, Rome, Italia
NODYS Publications, Rome, Italy., 37-38.
https://hdl.handle.net/21.15107/rcub_rims_475
Atanasovska I, Hedrih (Stevanović) K, Momčilović D. A theoretical model for vibro-impact dynamics of spur gears with tooth flanks wear. in Book of abstracts –The First International Nonlinear Dynamics Conference-NODYCON2019, Rome, Italia. 2019;:37-38.
https://hdl.handle.net/21.15107/rcub_rims_475 .
Atanasovska, Ivana, Hedrih (Stevanović), Katica, Momčilović, Dejan, "A theoretical model for vibro-impact dynamics of spur gears with tooth flanks wear" in Book of abstracts –The First International Nonlinear Dynamics Conference-NODYCON2019, Rome, Italia (2019):37-38,
https://hdl.handle.net/21.15107/rcub_rims_475 .

On biomimetics in machine elements design

Atanasovska, Ivana; Momčilović, Dejan

(Manipal University Jaipur, India, 2019)

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan
PY  - 2019
UR  - http://rims.institutims.rs/handle/123456789/474
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_rims_474
ER  - 
@conference{
author = "Atanasovska, Ivana and Momčilović, Dejan",
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_rims_474"
}
Atanasovska, I.,& Momčilović, D.. (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_rims_474
Atanasovska I, Momčilović D. 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_rims_474 .
Atanasovska, Ivana, Momčilović, Dejan, "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_rims_474 .