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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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