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 .

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Vukšić-Popović, Marija
AU  - Momčilović, Dejan
PY  - 2017
UR  - http://rims.institutims.rs/handle/123456789/470
AB  - The longitudinal  train  dynamics  which  included  movement  and  oscillations of coupled railway  vehicles  only  in  the  direction  of  the  track  (longitudinal)  is analyzed. The one direction motion of the train, as well as the relative motions between vehicles, is presumed. The assumption of exclusion of movements of the vehicles in the vertical direction is taken in  accordance  with the  real  low  values  of these displacements components. Model of train is generally present as a discrete non-homogeneous chain system with viscoelastic non-linear frictional elements. This model simulates railway vehicles equipped with conventional pneumatic brake system and brake blocks. In the presented research, for the developed train model, a general solution of the system of ordinary differential equations, which described  eigen  and forced vibrations of a non-homogeneous chain under the external one frequency excitation, is  obtained  and  analyzed.  The methods and procedures used  for  solving the described task are explained in detail. The presented theoretical simulation model and real dynamics of train composition are compared and conclusions about the suitability and accuracy of the developed model are discussed.
C3  - Abstracts of 14th International conference Dynamical Systems - Theory and Applications
T1  - Dynamics of train composition as a discrete non-homogeneous chain system
SP  - 126
UR  - https://hdl.handle.net/21.15107/rcub_rims_470
ER  - 

@conference{
author = "Atanasovska, Ivana and Vukšić-Popović, Marija and Momčilović, Dejan",
year = "2017",
abstract = "The longitudinal  train  dynamics  which  included  movement  and  oscillations of coupled railway  vehicles  only  in  the  direction  of  the  track  (longitudinal)  is analyzed. The one direction motion of the train, as well as the relative motions between vehicles, is presumed. The assumption of exclusion of movements of the vehicles in the vertical direction is taken in  accordance  with the  real  low  values  of these displacements components. Model of train is generally present as a discrete non-homogeneous chain system with viscoelastic non-linear frictional elements. This model simulates railway vehicles equipped with conventional pneumatic brake system and brake blocks. In the presented research, for the developed train model, a general solution of the system of ordinary differential equations, which described  eigen  and forced vibrations of a non-homogeneous chain under the external one frequency excitation, is  obtained  and  analyzed.  The methods and procedures used  for  solving the described task are explained in detail. The presented theoretical simulation model and real dynamics of train composition are compared and conclusions about the suitability and accuracy of the developed model are discussed.",
journal = "Abstracts of 14th International conference Dynamical Systems - Theory and Applications",
title = "Dynamics of train composition as a discrete non-homogeneous chain system",
pages = "126",
url = "https://hdl.handle.net/21.15107/rcub_rims_470"
}

Atanasovska, I., Vukšić-Popović, M.,& Momčilović, D.. (2017). Dynamics of train composition as a discrete non-homogeneous chain system. in Abstracts of 14th International conference Dynamical Systems - Theory and Applications, 126.
https://hdl.handle.net/21.15107/rcub_rims_470

Atanasovska I, Vukšić-Popović M, Momčilović D. Dynamics of train composition as a discrete non-homogeneous chain system. in Abstracts of 14th International conference Dynamical Systems - Theory and Applications. 2017;:126.
https://hdl.handle.net/21.15107/rcub_rims_470 .

Atanasovska, Ivana, Vukšić-Popović, Marija, Momčilović, Dejan, "Dynamics of train composition as a discrete non-homogeneous chain system" in Abstracts of 14th International conference Dynamical Systems - Theory and Applications (2017):126,
https://hdl.handle.net/21.15107/rcub_rims_470 .

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Momčilović, Dejan
AU  - Vukšić-Popović, Marija
PY  - 2017
UR  - http://rims.institutims.rs/handle/123456789/469
AB  - The design process for the elements which are the parts of the structures and equipment in power industry includes both of stress and strain state calculations, as well as an analysis of natural mode shapes and frequencies. During operation of the machine elements and systems, periodic vibration measurement in unloaded and loaded state is essential for high level of availability of the equipment operation. This is especially important after the reparation of particular elements of mechanical systems, when the vibration monitoring is source of the information necessary for their proper and safe use. Therefore, the previous numerical calculations of the eigen frequency and modal analysis give the necessary information for appropriate operation loading. In this paper the dynamics of the Kaplan turbine shaft is analyzed in accordance with these preferences. The Finite Element Analysis is used for numerical simulations and calculations. The real case of the shaft failure is chosen and the analyses are performed for the shaft before and after damage appearance. The cracks of different depth are modeled at the shaft to flange transition zone, in accordance with the real damages. Also, the model of the shaft with the shape and dimensions after the reparations is analyzed in order to compare the shaft dynamics with changed transition radius. Conclusions and discussion about the obtained results are given in comparison with the real operation conditions for the analyzed case study.
C3  - Abstracts of 14th International conference Dynamical Systems - Theory and Applications
T1  - Modal analysis of the hydro turbine shaft with cracks
SP  - 125
UR  - https://hdl.handle.net/21.15107/rcub_rims_469
ER  - 

@conference{
author = "Atanasovska, Ivana and Momčilović, Dejan and Vukšić-Popović, Marija",
year = "2017",
abstract = "The design process for the elements which are the parts of the structures and equipment in power industry includes both of stress and strain state calculations, as well as an analysis of natural mode shapes and frequencies. During operation of the machine elements and systems, periodic vibration measurement in unloaded and loaded state is essential for high level of availability of the equipment operation. This is especially important after the reparation of particular elements of mechanical systems, when the vibration monitoring is source of the information necessary for their proper and safe use. Therefore, the previous numerical calculations of the eigen frequency and modal analysis give the necessary information for appropriate operation loading. In this paper the dynamics of the Kaplan turbine shaft is analyzed in accordance with these preferences. The Finite Element Analysis is used for numerical simulations and calculations. The real case of the shaft failure is chosen and the analyses are performed for the shaft before and after damage appearance. The cracks of different depth are modeled at the shaft to flange transition zone, in accordance with the real damages. Also, the model of the shaft with the shape and dimensions after the reparations is analyzed in order to compare the shaft dynamics with changed transition radius. Conclusions and discussion about the obtained results are given in comparison with the real operation conditions for the analyzed case study.",
journal = "Abstracts of 14th International conference Dynamical Systems - Theory and Applications",
title = "Modal analysis of the hydro turbine shaft with cracks",
pages = "125",
url = "https://hdl.handle.net/21.15107/rcub_rims_469"
}

Atanasovska, I., Momčilović, D.,& Vukšić-Popović, M.. (2017). Modal analysis of the hydro turbine shaft with cracks. in Abstracts of 14th International conference Dynamical Systems - Theory and Applications, 125.
https://hdl.handle.net/21.15107/rcub_rims_469

Atanasovska I, Momčilović D, Vukšić-Popović M. Modal analysis of the hydro turbine shaft with cracks. in Abstracts of 14th International conference Dynamical Systems - Theory and Applications. 2017;:125.
https://hdl.handle.net/21.15107/rcub_rims_469 .

Atanasovska, Ivana, Momčilović, Dejan, Vukšić-Popović, Marija, "Modal analysis of the hydro turbine shaft with cracks" in Abstracts of 14th International conference Dynamical Systems - Theory and Applications (2017):125,
https://hdl.handle.net/21.15107/rcub_rims_469 .

TY  - CONF
AU  - Momčilović, Dejan
AU  - Atanasovska, Ivana
AU  - Mitrović, Radivoje
AU  - Vukšić-Popović, Marija
PY  - 2015
UR  - http://rims.institutims.rs/handle/123456789/468
AB  - The failures of various parts of mechanical systems in powe industry are the lessons that should be learned thoroughly. Every behaviour of structure close to design encelope must be ecxamined carefully in order to minimize financial losses in future and subsequently increase energy efficiency. Better design procedure or procedures that will gain more accurate results are major request to engineers and researchers last few decades. The verified methods that have proven potentials in application on power industry components coul be used ub assessment and evaluation of critical conditions that could lead to failures. A case study from hydro power plant turbine shaft was chosen as subject for design re-evaluating methodology. The classic analytical calculation of this shaft uses the Peterson's elastic stress concentration factor and calculates stress concentration factors and maximum stresses for different stress components of combined load and then calculate analytical valuesof total stress by hypothesis of maximal normal stress. On the opther hand, presented Finite Element Analysis simulates shaft stress state under real conditions of complex load by simulataneously applying all load components (bending, torsion and tension). Both of calculations are performed for few different radii in shaft-flange sections, as basis for re-evaluation of application of stress concentration factors.
PB  - Serbian Society of Mechanics and Faculty of Technical Sciences Novi Sad
C3  - 5th International Congress of Serbian Society of Mechanics, Aranđelovac, Srbija
T1  - Stress concentration factors in re-evaluation of design solution
UR  - https://hdl.handle.net/21.15107/rcub_rims_468
ER  - 

@conference{
author = "Momčilović, Dejan and Atanasovska, Ivana and Mitrović, Radivoje and Vukšić-Popović, Marija",
year = "2015",
abstract = "The failures of various parts of mechanical systems in powe industry are the lessons that should be learned thoroughly. Every behaviour of structure close to design encelope must be ecxamined carefully in order to minimize financial losses in future and subsequently increase energy efficiency. Better design procedure or procedures that will gain more accurate results are major request to engineers and researchers last few decades. The verified methods that have proven potentials in application on power industry components coul be used ub assessment and evaluation of critical conditions that could lead to failures. A case study from hydro power plant turbine shaft was chosen as subject for design re-evaluating methodology. The classic analytical calculation of this shaft uses the Peterson's elastic stress concentration factor and calculates stress concentration factors and maximum stresses for different stress components of combined load and then calculate analytical valuesof total stress by hypothesis of maximal normal stress. On the opther hand, presented Finite Element Analysis simulates shaft stress state under real conditions of complex load by simulataneously applying all load components (bending, torsion and tension). Both of calculations are performed for few different radii in shaft-flange sections, as basis for re-evaluation of application of stress concentration factors.",
publisher = "Serbian Society of Mechanics and Faculty of Technical Sciences Novi Sad",
journal = "5th International Congress of Serbian Society of Mechanics, Aranđelovac, Srbija",
title = "Stress concentration factors in re-evaluation of design solution",
url = "https://hdl.handle.net/21.15107/rcub_rims_468"
}

Momčilović, D., Atanasovska, I., Mitrović, R.,& Vukšić-Popović, M.. (2015). Stress concentration factors in re-evaluation of design solution. in 5th International Congress of Serbian Society of Mechanics, Aranđelovac, Srbija
Serbian Society of Mechanics and Faculty of Technical Sciences Novi Sad..
https://hdl.handle.net/21.15107/rcub_rims_468

Momčilović D, Atanasovska I, Mitrović R, Vukšić-Popović M. Stress concentration factors in re-evaluation of design solution. in 5th International Congress of Serbian Society of Mechanics, Aranđelovac, Srbija. 2015;.
https://hdl.handle.net/21.15107/rcub_rims_468 .

Momčilović, Dejan, Atanasovska, Ivana, Mitrović, Radivoje, Vukšić-Popović, Marija, "Stress concentration factors in re-evaluation of design solution" in 5th International Congress of Serbian Society of Mechanics, Aranđelovac, Srbija (2015),
https://hdl.handle.net/21.15107/rcub_rims_468 .

TY  - CONF
AU  - Atanasovska, Ivana
AU  - Vukšić-Popović, Marija
AU  - Momčilović, Dejan
PY  - 2015
UR  - http://rims.institutims.rs/handle/123456789/463
AB  - The coupled non-linear transient calculation is performed and explained in order to simulate the kinematic hardening behavior of AISI 316 steel and the Finite Element Method (FEM) is used for presented simulation. The material non-linear models features in Finite Element Analysis (FEA) are explained with special attention in non-linear kinematic hardening material models.
For simulating of non-linear kinematic hardening and ratcheting effects of AISI 316 steel the Chaboche constitutive material model is used. The Finite Element Model of rectangular block modeled for material behavior simulation is shown. Definition of constraints and input stresses is explained in detail.
The results obtained after six cycles of input stresses give the excellent superposition with theoretical results of other authors. The created diagrams show the ratcheting phenomenon of research material. Therefore, the FEM model developed for non-linear kinematic hardening research is verified and could be used for wide research of different materials under different input loads.
PB  - Serbian Society of Mechanics and Faculty of Technical Sciences Novi Sad, Serbia
C3  - International Congress of Serbian Society of Mechanics, Aranđelovac, Srbija
T1  - Simulation of the kinematic hardening of AISI 316 steel by nonlinear finite element analysis
UR  - https://hdl.handle.net/21.15107/rcub_rims_463
ER  - 

@conference{
author = "Atanasovska, Ivana and Vukšić-Popović, Marija and Momčilović, Dejan",
year = "2015",
abstract = "The coupled non-linear transient calculation is performed and explained in order to simulate the kinematic hardening behavior of AISI 316 steel and the Finite Element Method (FEM) is used for presented simulation. The material non-linear models features in Finite Element Analysis (FEA) are explained with special attention in non-linear kinematic hardening material models.
For simulating of non-linear kinematic hardening and ratcheting effects of AISI 316 steel the Chaboche constitutive material model is used. The Finite Element Model of rectangular block modeled for material behavior simulation is shown. Definition of constraints and input stresses is explained in detail.
The results obtained after six cycles of input stresses give the excellent superposition with theoretical results of other authors. The created diagrams show the ratcheting phenomenon of research material. Therefore, the FEM model developed for non-linear kinematic hardening research is verified and could be used for wide research of different materials under different input loads.",
publisher = "Serbian Society of Mechanics and Faculty of Technical Sciences Novi Sad, Serbia",
journal = "International Congress of Serbian Society of Mechanics, Aranđelovac, Srbija",
title = "Simulation of the kinematic hardening of AISI 316 steel by nonlinear finite element analysis",
url = "https://hdl.handle.net/21.15107/rcub_rims_463"
}

Atanasovska, I., Vukšić-Popović, M.,& Momčilović, D.. (2015). Simulation of the kinematic hardening of AISI 316 steel by nonlinear finite element analysis. in International Congress of Serbian Society of Mechanics, Aranđelovac, Srbija
Serbian Society of Mechanics and Faculty of Technical Sciences Novi Sad, Serbia..
https://hdl.handle.net/21.15107/rcub_rims_463

Atanasovska I, Vukšić-Popović M, Momčilović D. Simulation of the kinematic hardening of AISI 316 steel by nonlinear finite element analysis. in International Congress of Serbian Society of Mechanics, Aranđelovac, Srbija. 2015;.
https://hdl.handle.net/21.15107/rcub_rims_463 .

Atanasovska, Ivana, Vukšić-Popović, Marija, Momčilović, Dejan, "Simulation of the kinematic hardening of AISI 316 steel by nonlinear finite element analysis" in International Congress of Serbian Society of Mechanics, Aranđelovac, Srbija (2015),
https://hdl.handle.net/21.15107/rcub_rims_463 .