TY  - JOUR
AU  - Trajkovic, Isaak
AU  - Milošević, Miloš
AU  - Travica, Milan
AU  - Rakin, Marko
AU  - Mladenović, Goran
AU  - Kudrjavceva, Ljudmila
AU  - Međo, Bojan
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6874
AB  - This paper presents a part of development of a non-standard method for testing of cylindrical test specimens for measurement of fracture properties of pipeline materials. This method for testing of cylindrical structures working under pressure is based on determining of fracture mechanics parameters on SENT (Single Edge Notched Tension) specimens and new PRNT (Pipe Ring Notched Tension) specimens. In this work, both types of specimens required for this testing were manufactured from polyamide PA12 by using SLS (selective laser sintering) additive manufacturing method. Testing of the specimens is performed on the universal device for testing of mechanical properties of materials Shimadzu, AGS-X 100 kN. The tensile testing is accompanied by GOM Aramis 2M system, used for digital image correlation. By using these two systems, test results are obtained for ring-shaped and SENT specimens, including forces, displacements and fracture mechanics parameters CMOD (Crack Mouth Opening Displacement) and CTOD-δ5 (Crack Tip Opening Displacement obtained by δ5 technique), as well as crack growth. Repeatability of this process, along with valid result consistency, represent the basis for further development of the new method, including the determining of energy-based fracture mechanics parameters: J integral and stress intensity factor.
PB  - International Institute for the Science of Sintering
T2  - Science of Sintering
T1  - Novel Method for Measurement of Pipeline Materials Fracture Resistance-Examination on Selective Laser Sintered Cylindrical Specimens
EP  - 386
SP  - 373
VL  - 54
DO  - 10.2298/SOS2203373T
ER  - 

@article{
author = "Trajkovic, Isaak and Milošević, Miloš and Travica, Milan and Rakin, Marko and Mladenović, Goran and Kudrjavceva, Ljudmila and Međo, Bojan",
year = "2022",
abstract = "This paper presents a part of development of a non-standard method for testing of cylindrical test specimens for measurement of fracture properties of pipeline materials. This method for testing of cylindrical structures working under pressure is based on determining of fracture mechanics parameters on SENT (Single Edge Notched Tension) specimens and new PRNT (Pipe Ring Notched Tension) specimens. In this work, both types of specimens required for this testing were manufactured from polyamide PA12 by using SLS (selective laser sintering) additive manufacturing method. Testing of the specimens is performed on the universal device for testing of mechanical properties of materials Shimadzu, AGS-X 100 kN. The tensile testing is accompanied by GOM Aramis 2M system, used for digital image correlation. By using these two systems, test results are obtained for ring-shaped and SENT specimens, including forces, displacements and fracture mechanics parameters CMOD (Crack Mouth Opening Displacement) and CTOD-δ5 (Crack Tip Opening Displacement obtained by δ5 technique), as well as crack growth. Repeatability of this process, along with valid result consistency, represent the basis for further development of the new method, including the determining of energy-based fracture mechanics parameters: J integral and stress intensity factor.",
publisher = "International Institute for the Science of Sintering",
journal = "Science of Sintering",
title = "Novel Method for Measurement of Pipeline Materials Fracture Resistance-Examination on Selective Laser Sintered Cylindrical Specimens",
pages = "386-373",
volume = "54",
doi = "10.2298/SOS2203373T"
}

Trajkovic, I., Milošević, M., Travica, M., Rakin, M., Mladenović, G., Kudrjavceva, L.,& Međo, B.. (2022). Novel Method for Measurement of Pipeline Materials Fracture Resistance-Examination on Selective Laser Sintered Cylindrical Specimens. in Science of Sintering
International Institute for the Science of Sintering., 54, 373-386.
https://doi.org/10.2298/SOS2203373T

Trajkovic I, Milošević M, Travica M, Rakin M, Mladenović G, Kudrjavceva L, Međo B. Novel Method for Measurement of Pipeline Materials Fracture Resistance-Examination on Selective Laser Sintered Cylindrical Specimens. in Science of Sintering. 2022;54:373-386.
doi:10.2298/SOS2203373T .

Trajkovic, Isaak, Milošević, Miloš, Travica, Milan, Rakin, Marko, Mladenović, Goran, Kudrjavceva, Ljudmila, Međo, Bojan, "Novel Method for Measurement of Pipeline Materials Fracture Resistance-Examination on Selective Laser Sintered Cylindrical Specimens" in Science of Sintering, 54 (2022):373-386,
https://doi.org/10.2298/SOS2203373T . .

TY  - JOUR
AU  - Kudrjavceva, Ljudmila
AU  - Micunović, Milan
AU  - Miloradović, Danijela
AU  - Obradović, Aleksandar
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2655
AB  - Research of vehicle response to road roughness is particularly important when solving problems related to dynamic vehicle stability. In this paper, unevenness of roads is considered as the source of non-linear vibrations of motor vehicles. The vehicle is represented by an equivalent spatial model with seven degrees of freedom. In addition to solving the response by simulating it within a numerical code, quasi-linearization of nonlinear differential equations of motion is carried out. Solutions of quasi-linear differential equations of forced vibrations are determined using the small parameter method and are indispensable for the study of spatial stability of the vehicle. An optimal stabilization for a simplified two-dimensional model was performed. Spatial stability and internal resonance are considered briefly.
PB  - Srpsko društvo za mehaniku, Beograd
T2  - Theoretical and Applied Mechanics
T1  - Bertolino-baksa stability at nonlinear vibrations of motor vehicles
EP  - 291
IS  - 2
SP  - 271
VL  - 44
DO  - 10.2298/TAM171128019K
ER  - 

@article{
author = "Kudrjavceva, Ljudmila and Micunović, Milan and Miloradović, Danijela and Obradović, Aleksandar",
year = "2017",
abstract = "Research of vehicle response to road roughness is particularly important when solving problems related to dynamic vehicle stability. In this paper, unevenness of roads is considered as the source of non-linear vibrations of motor vehicles. The vehicle is represented by an equivalent spatial model with seven degrees of freedom. In addition to solving the response by simulating it within a numerical code, quasi-linearization of nonlinear differential equations of motion is carried out. Solutions of quasi-linear differential equations of forced vibrations are determined using the small parameter method and are indispensable for the study of spatial stability of the vehicle. An optimal stabilization for a simplified two-dimensional model was performed. Spatial stability and internal resonance are considered briefly.",
publisher = "Srpsko društvo za mehaniku, Beograd",
journal = "Theoretical and Applied Mechanics",
title = "Bertolino-baksa stability at nonlinear vibrations of motor vehicles",
pages = "291-271",
number = "2",
volume = "44",
doi = "10.2298/TAM171128019K"
}

Kudrjavceva, L., Micunović, M., Miloradović, D.,& Obradović, A.. (2017). Bertolino-baksa stability at nonlinear vibrations of motor vehicles. in Theoretical and Applied Mechanics
Srpsko društvo za mehaniku, Beograd., 44(2), 271-291.
https://doi.org/10.2298/TAM171128019K

Kudrjavceva L, Micunović M, Miloradović D, Obradović A. Bertolino-baksa stability at nonlinear vibrations of motor vehicles. in Theoretical and Applied Mechanics. 2017;44(2):271-291.
doi:10.2298/TAM171128019K .

Kudrjavceva, Ljudmila, Micunović, Milan, Miloradović, Danijela, Obradović, Aleksandar, "Bertolino-baksa stability at nonlinear vibrations of motor vehicles" in Theoretical and Applied Mechanics, 44, no. 2 (2017):271-291,
https://doi.org/10.2298/TAM171128019K . .

TY  - JOUR
AU  - Kudrjavceva, Ljudmila
AU  - Micunović, Milan
AU  - Topalović, Marko D.
AU  - Sedmak, Simon
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2027
AB  - Thermomechanical behavior of hot mix asphalt (HMA) is considered. Its highly irregular microstructure is covered by the hierarchical approach. A brief survey of endochronic thermodynamics precedes constitutive consideration. Two constitutive models are discussed: classical Perzyna's approach and tensor representation based approach. The second is superior due to its possibility to cover properly diverse multiaxial non-proportional stress-strain histories. However, due to availability of experimental data the first model is applied to rutting problem through Abaqus FEM code with material user subroutine developed by the authors. Vakulenko's thermodynamic time appropriate for aging is incorporated. Hyper elastic-viscoplastic behavior is considered and some preliminary results are presented.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Thermomechanics of soft inelastics bodies with application to asphalt behavior
EP  - S228
SP  - S221
VL  - 18
DO  - 10.2298/TSCI130812184K
ER  - 

@article{
author = "Kudrjavceva, Ljudmila and Micunović, Milan and Topalović, Marko D. and Sedmak, Simon",
year = "2014",
abstract = "Thermomechanical behavior of hot mix asphalt (HMA) is considered. Its highly irregular microstructure is covered by the hierarchical approach. A brief survey of endochronic thermodynamics precedes constitutive consideration. Two constitutive models are discussed: classical Perzyna's approach and tensor representation based approach. The second is superior due to its possibility to cover properly diverse multiaxial non-proportional stress-strain histories. However, due to availability of experimental data the first model is applied to rutting problem through Abaqus FEM code with material user subroutine developed by the authors. Vakulenko's thermodynamic time appropriate for aging is incorporated. Hyper elastic-viscoplastic behavior is considered and some preliminary results are presented.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Thermomechanics of soft inelastics bodies with application to asphalt behavior",
pages = "S228-S221",
volume = "18",
doi = "10.2298/TSCI130812184K"
}

Kudrjavceva, L., Micunović, M., Topalović, M. D.,& Sedmak, S.. (2014). Thermomechanics of soft inelastics bodies with application to asphalt behavior. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 18, S221-S228.
https://doi.org/10.2298/TSCI130812184K

Kudrjavceva L, Micunović M, Topalović MD, Sedmak S. Thermomechanics of soft inelastics bodies with application to asphalt behavior. in Thermal Science. 2014;18:S221-S228.
doi:10.2298/TSCI130812184K .

Kudrjavceva, Ljudmila, Micunović, Milan, Topalović, Marko D., Sedmak, Simon, "Thermomechanics of soft inelastics bodies with application to asphalt behavior" in Thermal Science, 18 (2014):S221-S228,
https://doi.org/10.2298/TSCI130812184K . .