TY  - CONF
AU  - Elek, Predrag
AU  - Marković, Miloš
AU  - Jevtić, Dejan
AU  - Đurović, Radovan
PY  - 2024
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7802
AB  - Shaped charge effect have been successfully used in various fields, including defense (anti-armor projectiles and warheads) and non-military (explosive demolitions, oil and natural gas industry) applications. The shaped charge mechanism relies on conversion of explosive charge detonation energy into kinetic energy of a hypervelocity metal penetrator, known as a jet [1]. The focus of the present research is on the jet interaction with the target material and consequent target penetration. 
Two approaches to the jet penetration depth determination are considered. The first is the well-known analytical model based on the virtual origin concept [2, 3]. The second approach is the numerical modeling of the penetration process. The commercial FEM based software Abaqus/Explicit has been used for simulations and the model formulation is described in detail. The complete process of the shaped charge jet formation and penetration is successfully simulated using the pure Eulerian approach with appropriate material models [4].
Comprehensive comparison between results obtained using various theoretical models (analytical and numerical) and experimental data has been made. The following process parameters are considered: jet tip velocity, jet diameter, target cavity diameter, penetration time and penetration depth (Fig. 1). The jet velocity gradient and jet evolution are carefully analyzed in order to provide evaluation of the position of the virtual origin in time-space coordinates (Fig. 2). Comparison of analytical and numerical model results in terms of the jet tip velocity, penetration velocity and penetration depth has been performed. In contrast to the theoretically constant ratio of penetration velocity to jet tip velocity, the simulation results show that this ratio is actually variable. Analytically determined penetration depth is about 10% higher than numerical evaluation. Generally, an acceptable correlation between analytical and numerical model results has been found, which nevertheless shows that an improvement of analytical models is needed.
PB  - Fraunhofer Institute for High Speed Dynamics, Ernst-Mach-Institut, EMI, Germany
C3  - Proceedings of the 4th International Conference on Impact Loading of Structures and Materials
T1  - Numerical and analytical modeling of a shaped charge penetration depth
EP  - 89
SP  - 88
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7802
ER  - 

@conference{
author = "Elek, Predrag and Marković, Miloš and Jevtić, Dejan and Đurović, Radovan",
year = "2024",
abstract = "Shaped charge effect have been successfully used in various fields, including defense (anti-armor projectiles and warheads) and non-military (explosive demolitions, oil and natural gas industry) applications. The shaped charge mechanism relies on conversion of explosive charge detonation energy into kinetic energy of a hypervelocity metal penetrator, known as a jet [1]. The focus of the present research is on the jet interaction with the target material and consequent target penetration. 
Two approaches to the jet penetration depth determination are considered. The first is the well-known analytical model based on the virtual origin concept [2, 3]. The second approach is the numerical modeling of the penetration process. The commercial FEM based software Abaqus/Explicit has been used for simulations and the model formulation is described in detail. The complete process of the shaped charge jet formation and penetration is successfully simulated using the pure Eulerian approach with appropriate material models [4].
Comprehensive comparison between results obtained using various theoretical models (analytical and numerical) and experimental data has been made. The following process parameters are considered: jet tip velocity, jet diameter, target cavity diameter, penetration time and penetration depth (Fig. 1). The jet velocity gradient and jet evolution are carefully analyzed in order to provide evaluation of the position of the virtual origin in time-space coordinates (Fig. 2). Comparison of analytical and numerical model results in terms of the jet tip velocity, penetration velocity and penetration depth has been performed. In contrast to the theoretically constant ratio of penetration velocity to jet tip velocity, the simulation results show that this ratio is actually variable. Analytically determined penetration depth is about 10% higher than numerical evaluation. Generally, an acceptable correlation between analytical and numerical model results has been found, which nevertheless shows that an improvement of analytical models is needed.",
publisher = "Fraunhofer Institute for High Speed Dynamics, Ernst-Mach-Institut, EMI, Germany",
journal = "Proceedings of the 4th International Conference on Impact Loading of Structures and Materials",
title = "Numerical and analytical modeling of a shaped charge penetration depth",
pages = "89-88",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7802"
}

Elek, P., Marković, M., Jevtić, D.,& Đurović, R.. (2024). Numerical and analytical modeling of a shaped charge penetration depth. in Proceedings of the 4th International Conference on Impact Loading of Structures and Materials
Fraunhofer Institute for High Speed Dynamics, Ernst-Mach-Institut, EMI, Germany., 88-89.
https://hdl.handle.net/21.15107/rcub_machinery_7802

Elek P, Marković M, Jevtić D, Đurović R. Numerical and analytical modeling of a shaped charge penetration depth. in Proceedings of the 4th International Conference on Impact Loading of Structures and Materials. 2024;:88-89.
https://hdl.handle.net/21.15107/rcub_machinery_7802 .

Elek, Predrag, Marković, Miloš, Jevtić, Dejan, Đurović, Radovan, "Numerical and analytical modeling of a shaped charge penetration depth" in Proceedings of the 4th International Conference on Impact Loading of Structures and Materials (2024):88-89,
https://hdl.handle.net/21.15107/rcub_machinery_7802 .

TY  - CONF
AU  - Elek, Predrag
AU  - Đorđević, Miroslav
AU  - Marković, Miloš
AU  - Jevtić, Dejan
AU  - Đurović, Radovan
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7075
AB  - Characterization of behind armor debris (BAD) is of utmost importance from the aspect of evaluation of an armor piercing projectile efficiency, as well as from the point of target vulnerability. The focus of the study is on the size, shape, total number, mass and velocity of fragments generated from the target plate. The experimental results of perforation of 6.35 mm thick steel plates by 12.7 mm armor-piercing projectile have been reported. Projectile impact and residual velocity were measured by the muzzle velocity radar system and make-up screens, respectively. The mass and shape distribution of a generated BAD cloud and its energetic properties were determined using the calibrated witness pack. The proposed analytical model of the problem is based on the energy conservation, fracture mechanics and fragmentation theory. A good agreement is observed between calculated results and experimental data in terms of the shape, characteristic size, mass and velocity distribution of generated fragments.
PB  - DESTech Publications, Inc.
C3  - 33rd International Symposium on Ballistics, Bruges, Belgium, 16-20 October 2023
T1  - Experimental and analytical study of behind armor debris after perforation of a steel plate by an AP projectile
SP  - pp. 1726-1737
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7075
ER  - 

@conference{
author = "Elek, Predrag and Đorđević, Miroslav and Marković, Miloš and Jevtić, Dejan and Đurović, Radovan",
year = "2023",
abstract = "Characterization of behind armor debris (BAD) is of utmost importance from the aspect of evaluation of an armor piercing projectile efficiency, as well as from the point of target vulnerability. The focus of the study is on the size, shape, total number, mass and velocity of fragments generated from the target plate. The experimental results of perforation of 6.35 mm thick steel plates by 12.7 mm armor-piercing projectile have been reported. Projectile impact and residual velocity were measured by the muzzle velocity radar system and make-up screens, respectively. The mass and shape distribution of a generated BAD cloud and its energetic properties were determined using the calibrated witness pack. The proposed analytical model of the problem is based on the energy conservation, fracture mechanics and fragmentation theory. A good agreement is observed between calculated results and experimental data in terms of the shape, characteristic size, mass and velocity distribution of generated fragments.",
publisher = "DESTech Publications, Inc.",
journal = "33rd International Symposium on Ballistics, Bruges, Belgium, 16-20 October 2023",
title = "Experimental and analytical study of behind armor debris after perforation of a steel plate by an AP projectile",
pages = "pp. 1726-1737",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7075"
}

Elek, P., Đorđević, M., Marković, M., Jevtić, D.,& Đurović, R.. (2023). Experimental and analytical study of behind armor debris after perforation of a steel plate by an AP projectile. in 33rd International Symposium on Ballistics, Bruges, Belgium, 16-20 October 2023
DESTech Publications, Inc.., pp. 1726-1737.
https://hdl.handle.net/21.15107/rcub_machinery_7075

Elek P, Đorđević M, Marković M, Jevtić D, Đurović R. Experimental and analytical study of behind armor debris after perforation of a steel plate by an AP projectile. in 33rd International Symposium on Ballistics, Bruges, Belgium, 16-20 October 2023. 2023;:pp. 1726-1737.
https://hdl.handle.net/21.15107/rcub_machinery_7075 .

Elek, Predrag, Đorđević, Miroslav, Marković, Miloš, Jevtić, Dejan, Đurović, Radovan, "Experimental and analytical study of behind armor debris after perforation of a steel plate by an AP projectile" in 33rd International Symposium on Ballistics, Bruges, Belgium, 16-20 October 2023 (2023):pp. 1726-1737,
https://hdl.handle.net/21.15107/rcub_machinery_7075 .

TY  - CONF
AU  - Elek, Predrag
AU  - Marković, Miloš
AU  - Jevtić, Dejan
AU  - Đurović, Radovan
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6910
AB  - The shaped charge effect is currently the most powerful target penetration mechanism. It relies on conversion of explosive charge detonation energy into kinetic energy of a hypervelocity metal penetrator, known as a jet. The first stage of the shaped charge mechanism is formation of the jet through processes of detonation wave propagation and interaction with a metal liner which accelerates and collapses towards the symmetry axis creating the slug and the jet. Our focus in the present research is on the second stage of the process: the jet interaction with the target material and consequent target penetration/perforation. 
There are many approaches to the modeling of shaped charge jet penetration depth into target material. Two major analytical models are: the simple density law and the model with variable jet velocity. However, the most accurate is the approach based on numerical simulations using so called hydrocodes. Modeling and simulation in Abaqus/Explicit software is presented in detail. The complete process of jet formation and penetration is simulated using the Eulerian approach.
Comprehensive comparison between results obtained using various theoretical models (analytical and numerical) and experimental data has been performed providing useful insights and conclusions.
PB  - Belgrade : Serbian Society of Mechanics
C3  - 9th Congress of the Serbian Society of Mechanics, July 5-7, 2023, Vrnjačka Banja, Serbia
T1  - Modeling of penetration depth of a shaped charge jet
EP  - 1
SP  - 1
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6910
ER  - 

@conference{
author = "Elek, Predrag and Marković, Miloš and Jevtić, Dejan and Đurović, Radovan",
year = "2023",
abstract = "The shaped charge effect is currently the most powerful target penetration mechanism. It relies on conversion of explosive charge detonation energy into kinetic energy of a hypervelocity metal penetrator, known as a jet. The first stage of the shaped charge mechanism is formation of the jet through processes of detonation wave propagation and interaction with a metal liner which accelerates and collapses towards the symmetry axis creating the slug and the jet. Our focus in the present research is on the second stage of the process: the jet interaction with the target material and consequent target penetration/perforation. 
There are many approaches to the modeling of shaped charge jet penetration depth into target material. Two major analytical models are: the simple density law and the model with variable jet velocity. However, the most accurate is the approach based on numerical simulations using so called hydrocodes. Modeling and simulation in Abaqus/Explicit software is presented in detail. The complete process of jet formation and penetration is simulated using the Eulerian approach.
Comprehensive comparison between results obtained using various theoretical models (analytical and numerical) and experimental data has been performed providing useful insights and conclusions.",
publisher = "Belgrade : Serbian Society of Mechanics",
journal = "9th Congress of the Serbian Society of Mechanics, July 5-7, 2023, Vrnjačka Banja, Serbia",
title = "Modeling of penetration depth of a shaped charge jet",
pages = "1-1",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6910"
}

Elek, P., Marković, M., Jevtić, D.,& Đurović, R.. (2023). Modeling of penetration depth of a shaped charge jet. in 9th Congress of the Serbian Society of Mechanics, July 5-7, 2023, Vrnjačka Banja, Serbia
Belgrade : Serbian Society of Mechanics., 1-1.
https://hdl.handle.net/21.15107/rcub_machinery_6910

Elek P, Marković M, Jevtić D, Đurović R. Modeling of penetration depth of a shaped charge jet. in 9th Congress of the Serbian Society of Mechanics, July 5-7, 2023, Vrnjačka Banja, Serbia. 2023;:1-1.
https://hdl.handle.net/21.15107/rcub_machinery_6910 .

Elek, Predrag, Marković, Miloš, Jevtić, Dejan, Đurović, Radovan, "Modeling of penetration depth of a shaped charge jet" in 9th Congress of the Serbian Society of Mechanics, July 5-7, 2023, Vrnjačka Banja, Serbia (2023):1-1,
https://hdl.handle.net/21.15107/rcub_machinery_6910 .

TY  - JOUR
AU  - Marković, Miloš
AU  - Elek, Predrag
AU  - Jaramaz, Dragana
AU  - Jevtić, Dejan
AU  - Đurović, Radovan
AU  - Jaramaz, Lana
AU  - Micković, Dušan
PY  - 2023
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6064
AB  - The purpose of a gun bore evacuator on the turret-mounted gun barrel is to prevent the entry of the gaseous products of gun propellant combustion into the turret compartment of the vehicle after the breech block opening. The mathematical
model which takes into account all of the main parameters influencing the pressure
change inside the cylinder of the evacuator was developed. Differential equations
that describe the flow field through the nozzle in the barrel wall and in the cylinder
of the evacuator were solved numerically. Furthermore, the numerical simulations
were performed using the ANSYS FLUENT in order to analyze the phenomena
occuring in the evacuator during the charge and discharge cycles which are difficult to be taken into account with the analytical model. Aforementioned simulations were performed with the 3-D model of the evacuator and with the initial and
boundary conditions obtained from the interior ballistic calculations. In order to
find the change of the static pressure in the cylinder of the gun bore evacuator, the
experimental research was performed. The comprehensive comparison between
the numerical results and the experimental data has shown good agreement. Based
upon this analysis, the influence of the evacuator’s main design parameters on the
pressure distribution and the temperatures in the critical zones was determined.
The influence of the propellant’s initial temperature on the pressure and wall temperatures in the evacuator was also analyzed, due to the wide range of gun operating temperatures and the possibility of erosion occurrence
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Analysis of parameters influencing the pressure and temperature distribution in the gun bore evacuator
EP  - 738
IS  - 1B
SP  - 727
VL  - 27
DO  - 10.2298/TSCI220409102M
ER  - 

@article{
author = "Marković, Miloš and Elek, Predrag and Jaramaz, Dragana and Jevtić, Dejan and Đurović, Radovan and Jaramaz, Lana and Micković, Dušan",
year = "2023",
abstract = "The purpose of a gun bore evacuator on the turret-mounted gun barrel is to prevent the entry of the gaseous products of gun propellant combustion into the turret compartment of the vehicle after the breech block opening. The mathematical
model which takes into account all of the main parameters influencing the pressure
change inside the cylinder of the evacuator was developed. Differential equations
that describe the flow field through the nozzle in the barrel wall and in the cylinder
of the evacuator were solved numerically. Furthermore, the numerical simulations
were performed using the ANSYS FLUENT in order to analyze the phenomena
occuring in the evacuator during the charge and discharge cycles which are difficult to be taken into account with the analytical model. Aforementioned simulations were performed with the 3-D model of the evacuator and with the initial and
boundary conditions obtained from the interior ballistic calculations. In order to
find the change of the static pressure in the cylinder of the gun bore evacuator, the
experimental research was performed. The comprehensive comparison between
the numerical results and the experimental data has shown good agreement. Based
upon this analysis, the influence of the evacuator’s main design parameters on the
pressure distribution and the temperatures in the critical zones was determined.
The influence of the propellant’s initial temperature on the pressure and wall temperatures in the evacuator was also analyzed, due to the wide range of gun operating temperatures and the possibility of erosion occurrence",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Analysis of parameters influencing the pressure and temperature distribution in the gun bore evacuator",
pages = "738-727",
number = "1B",
volume = "27",
doi = "10.2298/TSCI220409102M"
}

Marković, M., Elek, P., Jaramaz, D., Jevtić, D., Đurović, R., Jaramaz, L.,& Micković, D.. (2023). Analysis of parameters influencing the pressure and temperature distribution in the gun bore evacuator. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 27(1B), 727-738.
https://doi.org/10.2298/TSCI220409102M

Marković M, Elek P, Jaramaz D, Jevtić D, Đurović R, Jaramaz L, Micković D. Analysis of parameters influencing the pressure and temperature distribution in the gun bore evacuator. in Thermal Science. 2023;27(1B):727-738.
doi:10.2298/TSCI220409102M .

Marković, Miloš, Elek, Predrag, Jaramaz, Dragana, Jevtić, Dejan, Đurović, Radovan, Jaramaz, Lana, Micković, Dušan, "Analysis of parameters influencing the pressure and temperature distribution in the gun bore evacuator" in Thermal Science, 27, no. 1B (2023):727-738,
https://doi.org/10.2298/TSCI220409102M . .

TY  - CONF
AU  - Đurović, Radovan
AU  - Elek, Predrag
AU  - Marković, Miloš
AU  - Jevtić, Dejan
AU  - Erčević, Mihailo
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4997
AB  - In the present study, penetration of a 6.5 mm Grendel armor-piercing projectile with a front tungsten carbidecobalt core and rear lead-antimony core into the 8.5 mm PROTAC 500 high hardness armor steel plate was analyzed both experimentally and numerically. Ballistic tests were performed in which the projectile’s initial velocity had the value of 740 m/s. Experimental results have shown that the partial perforation with the projectile embedment was the most frequent outcome. Two-dimensional axisymmetric non-linear numerical model corresponding to the performed tests was developed in ANSYS AUTODYN software using the mesh based Lagrangian technique. Johnson-Cook strength and failure models were employed for the characterization of the material behavior. Developed numerical model was verified against the experimental results and the influence of the projectile’s impact velocity on the parameters of the penetration was investigated. Rear lead alloy core was found to be able to provide significant enhancement of the projectile’s efficiency.
PB  - Belgrade : Military Technical Institute
C3  - 10th International Scientific Conference on Defensive Technologies – OTEH 2022, Belgrade
T1  - Numerical analysis of the tungsten carbide-cobalt cored bullet penetrating the high-hardness steel plate
SP  - 161/61
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4997
ER  - 

@conference{
author = "Đurović, Radovan and Elek, Predrag and Marković, Miloš and Jevtić, Dejan and Erčević, Mihailo",
year = "2022",
abstract = "In the present study, penetration of a 6.5 mm Grendel armor-piercing projectile with a front tungsten carbidecobalt core and rear lead-antimony core into the 8.5 mm PROTAC 500 high hardness armor steel plate was analyzed both experimentally and numerically. Ballistic tests were performed in which the projectile’s initial velocity had the value of 740 m/s. Experimental results have shown that the partial perforation with the projectile embedment was the most frequent outcome. Two-dimensional axisymmetric non-linear numerical model corresponding to the performed tests was developed in ANSYS AUTODYN software using the mesh based Lagrangian technique. Johnson-Cook strength and failure models were employed for the characterization of the material behavior. Developed numerical model was verified against the experimental results and the influence of the projectile’s impact velocity on the parameters of the penetration was investigated. Rear lead alloy core was found to be able to provide significant enhancement of the projectile’s efficiency.",
publisher = "Belgrade : Military Technical Institute",
journal = "10th International Scientific Conference on Defensive Technologies – OTEH 2022, Belgrade",
title = "Numerical analysis of the tungsten carbide-cobalt cored bullet penetrating the high-hardness steel plate",
pages = "161/61",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4997"
}

Đurović, R., Elek, P., Marković, M., Jevtić, D.,& Erčević, M.. (2022). Numerical analysis of the tungsten carbide-cobalt cored bullet penetrating the high-hardness steel plate. in 10th International Scientific Conference on Defensive Technologies – OTEH 2022, Belgrade
Belgrade : Military Technical Institute., 161/61.
https://hdl.handle.net/21.15107/rcub_machinery_4997

Đurović R, Elek P, Marković M, Jevtić D, Erčević M. Numerical analysis of the tungsten carbide-cobalt cored bullet penetrating the high-hardness steel plate. in 10th International Scientific Conference on Defensive Technologies – OTEH 2022, Belgrade. 2022;:161/61.
https://hdl.handle.net/21.15107/rcub_machinery_4997 .

Đurović, Radovan, Elek, Predrag, Marković, Miloš, Jevtić, Dejan, Erčević, Mihailo, "Numerical analysis of the tungsten carbide-cobalt cored bullet penetrating the high-hardness steel plate" in 10th International Scientific Conference on Defensive Technologies – OTEH 2022, Belgrade (2022):161/61,
https://hdl.handle.net/21.15107/rcub_machinery_4997 .

TY  - CONF
AU  - Marković, Miloš
AU  - Elek, Predrag
AU  - Jevtić, Dejan
AU  - Đurović, Radovan
AU  - Todić, Ivana
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6050
AB  - Purpose of the precursor shaped charge warhead is to initiate the Explosive Reactive Armor (ERA) and thus
provide an unobstructed path to the jet of the main shaped charge. The precursor warhead is most commonly placed in
the front of the missile where it is surrounded by other subsystems. All of the subsystems which lay on the path of the
precursor warhead’s shaped charge jet represent the obstacle that will decrease its efficiency. The goal of this paper is
to analyze the precursor warhead’s performance in a case where the inhomogeneous obstacle is placed in front of it.
The numerical analysis of the obstructed formation process was performed in order to determine the properties of the
formed jet using ANSYS AUTODYN 2D software. For the existing missile configuration, jet formation process and
precursor warhead's performance against ERA were analyzed numerically. Significant differences in formed jet's
properties were observed for the simulations with and without the inhomogeneous obstacles. In the case of
inhomogeneous obstacle it is present decreasing of jet tip velocity for around 23%, decreasing of jet tip dimaeter for
around 50% and jet time are delayed in contact with ERA front panel for around 10 µs. Obtained results indicate that
in the observed cases, formed jet has enough energy to initiate the explosive reactive armor.
PB  - Belgrade : Military Technical Institute
C3  - 10th International Scientific Conference – OTEH 2022, Belgrade, 13-14 October 2022
T1  - Numerical analysis of the inhomogeneous obstacle influence on the precursor shaped charge warhead performance
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6050
ER  - 

@conference{
author = "Marković, Miloš and Elek, Predrag and Jevtić, Dejan and Đurović, Radovan and Todić, Ivana",
year = "2022",
abstract = "Purpose of the precursor shaped charge warhead is to initiate the Explosive Reactive Armor (ERA) and thus
provide an unobstructed path to the jet of the main shaped charge. The precursor warhead is most commonly placed in
the front of the missile where it is surrounded by other subsystems. All of the subsystems which lay on the path of the
precursor warhead’s shaped charge jet represent the obstacle that will decrease its efficiency. The goal of this paper is
to analyze the precursor warhead’s performance in a case where the inhomogeneous obstacle is placed in front of it.
The numerical analysis of the obstructed formation process was performed in order to determine the properties of the
formed jet using ANSYS AUTODYN 2D software. For the existing missile configuration, jet formation process and
precursor warhead's performance against ERA were analyzed numerically. Significant differences in formed jet's
properties were observed for the simulations with and without the inhomogeneous obstacles. In the case of
inhomogeneous obstacle it is present decreasing of jet tip velocity for around 23%, decreasing of jet tip dimaeter for
around 50% and jet time are delayed in contact with ERA front panel for around 10 µs. Obtained results indicate that
in the observed cases, formed jet has enough energy to initiate the explosive reactive armor.",
publisher = "Belgrade : Military Technical Institute",
journal = "10th International Scientific Conference – OTEH 2022, Belgrade, 13-14 October 2022",
title = "Numerical analysis of the inhomogeneous obstacle influence on the precursor shaped charge warhead performance",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6050"
}

Marković, M., Elek, P., Jevtić, D., Đurović, R.,& Todić, I.. (2022). Numerical analysis of the inhomogeneous obstacle influence on the precursor shaped charge warhead performance. in 10th International Scientific Conference – OTEH 2022, Belgrade, 13-14 October 2022
Belgrade : Military Technical Institute..
https://hdl.handle.net/21.15107/rcub_machinery_6050

Marković M, Elek P, Jevtić D, Đurović R, Todić I. Numerical analysis of the inhomogeneous obstacle influence on the precursor shaped charge warhead performance. in 10th International Scientific Conference – OTEH 2022, Belgrade, 13-14 October 2022. 2022;.
https://hdl.handle.net/21.15107/rcub_machinery_6050 .

Marković, Miloš, Elek, Predrag, Jevtić, Dejan, Đurović, Radovan, Todić, Ivana, "Numerical analysis of the inhomogeneous obstacle influence on the precursor shaped charge warhead performance" in 10th International Scientific Conference – OTEH 2022, Belgrade, 13-14 October 2022 (2022),
https://hdl.handle.net/21.15107/rcub_machinery_6050 .

TY  - CONF
AU  - Jevtić, Dejan
AU  - Micković, Dejan
AU  - Elek, Predrag
AU  - Marković, Miloš
AU  - Jaramaz, Lana
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6057
AB  - The muzzle brake is an important part of the artillery system because of its efficiency
depends reliable work of the recoil system. To estimate the efficiency of the muzzle brake, it is
important to determine the time-dependent pressure and velocity field inside the muzzle brake,
which depends on the geometry of the brake, pressure and velocity of the gases at the gun muzzle,
energy loses in the flow field along the muzzle brake etc. Also, the analysis of the flow field
parameters of the gunpowder combustion products in the muzzle brake provides stress and
temperature field in the brake, which affects the design parameters, material type and surface
protection of the muzzle brake. The numerical simulation was performed using CFD software
ANSYS Fluent to analyze phenomena inside the muzzle brake during the emptying of the gun
barrel. Numerical simulation was performed in 2D geometry which was created based on the mass
flow in 3D geometry. Experimental results were obtained measuring static pressure of the
gunpowder combustion products at three places along the axis of the brake. A comprehensive
comparison between numerical and experimental results shows good agreement. Based on this
analysis, it was determined how geometry parameters of the muzzle brake and flow parameters on
the gun muzzle affects its efficiency. This allows finding the optimal design parameters of the
muzzle brake, taking into account the possibility of production. The analysis of the flow field
parameters in the muzzle brake is not important only because of the determination of its efficiency,
but it allows further analysis of the blast pressure around the gun and its effect on the gun crew
members.
PB  - University Politehnica Timișoara,  University of Banja Luka
C3  - International Conference on Applied Sciences – ICAS 2020, Maz 20-22, 2020, Romania
T1  - Numerical simulation of gas flow field in a muzzle brake
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6057
ER  - 

@conference{
author = "Jevtić, Dejan and Micković, Dejan and Elek, Predrag and Marković, Miloš and Jaramaz, Lana",
year = "2020",
abstract = "The muzzle brake is an important part of the artillery system because of its efficiency
depends reliable work of the recoil system. To estimate the efficiency of the muzzle brake, it is
important to determine the time-dependent pressure and velocity field inside the muzzle brake,
which depends on the geometry of the brake, pressure and velocity of the gases at the gun muzzle,
energy loses in the flow field along the muzzle brake etc. Also, the analysis of the flow field
parameters of the gunpowder combustion products in the muzzle brake provides stress and
temperature field in the brake, which affects the design parameters, material type and surface
protection of the muzzle brake. The numerical simulation was performed using CFD software
ANSYS Fluent to analyze phenomena inside the muzzle brake during the emptying of the gun
barrel. Numerical simulation was performed in 2D geometry which was created based on the mass
flow in 3D geometry. Experimental results were obtained measuring static pressure of the
gunpowder combustion products at three places along the axis of the brake. A comprehensive
comparison between numerical and experimental results shows good agreement. Based on this
analysis, it was determined how geometry parameters of the muzzle brake and flow parameters on
the gun muzzle affects its efficiency. This allows finding the optimal design parameters of the
muzzle brake, taking into account the possibility of production. The analysis of the flow field
parameters in the muzzle brake is not important only because of the determination of its efficiency,
but it allows further analysis of the blast pressure around the gun and its effect on the gun crew
members.",
publisher = "University Politehnica Timișoara,  University of Banja Luka",
journal = "International Conference on Applied Sciences – ICAS 2020, Maz 20-22, 2020, Romania",
title = "Numerical simulation of gas flow field in a muzzle brake",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6057"
}

Jevtić, D., Micković, D., Elek, P., Marković, M.,& Jaramaz, L.. (2020). Numerical simulation of gas flow field in a muzzle brake. in International Conference on Applied Sciences – ICAS 2020, Maz 20-22, 2020, Romania
University Politehnica Timișoara,  University of Banja Luka..
https://hdl.handle.net/21.15107/rcub_machinery_6057

Jevtić D, Micković D, Elek P, Marković M, Jaramaz L. Numerical simulation of gas flow field in a muzzle brake. in International Conference on Applied Sciences – ICAS 2020, Maz 20-22, 2020, Romania. 2020;.
https://hdl.handle.net/21.15107/rcub_machinery_6057 .

Jevtić, Dejan, Micković, Dejan, Elek, Predrag, Marković, Miloš, Jaramaz, Lana, "Numerical simulation of gas flow field in a muzzle brake" in International Conference on Applied Sciences – ICAS 2020, Maz 20-22, 2020, Romania (2020),
https://hdl.handle.net/21.15107/rcub_machinery_6057 .

TY  - CONF
AU  - Jevtić, Dejan
AU  - Micković, Dejan
AU  - Elek, Predrag
AU  - Marković, Miloš
AU  - Jaramaz, Lana
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6053
AB  - The pressure change in time in the hydraulic brake of the automatic cannon depends on many factors such as
the geometry of the brake, the velocity of the piston, the amount of the hydraulic oil in the brake, elevation angle of the
cannon, etc. The analysis was made at the extreme values of the temperature interval of the cannon usage as well as the
normal temperature since the temperature affects the properties of the hydraulic oil. The numerical simulation of the flow
field in the hydraulic brake during recoil was performed in CFD software ANSYS Fluent. The simulation was made in a
2D numerical domain based on the flow geometry in 3D space. Due to the flow field boundaries movement during the
process, the dynamic mesh was employed. The dynamics of the hydraulic brake piston was determined using the solver
in which the forces that act on the gun are defined by the User Defined Function file. The experiment was performed by
firing from the 20mm M55 gun mounted on the stand. Experimental results contain pressure change in time inside the
brake which was measured by the piezoelectric pressure sensor. The dynamic behavior of the cannon was recorded by
the high-speed camera. The numerical results of the pressure change and position of the gun deviate within acceptable
limits with respect to experimental results. Based on that, further analysis of the influence parameters on the hydraulic
brake force can be done by numerical simulation.
PB  - Belgrade : Military Technical Institute
C3  - 9th International Scientific Conference – OTEH 2020, Belgrade, 8-9 October 2020
T1  - Analysis of the influence parameters on the pressure field in the hydraulic brake
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6053
ER  - 

@conference{
author = "Jevtić, Dejan and Micković, Dejan and Elek, Predrag and Marković, Miloš and Jaramaz, Lana",
year = "2020",
abstract = "The pressure change in time in the hydraulic brake of the automatic cannon depends on many factors such as
the geometry of the brake, the velocity of the piston, the amount of the hydraulic oil in the brake, elevation angle of the
cannon, etc. The analysis was made at the extreme values of the temperature interval of the cannon usage as well as the
normal temperature since the temperature affects the properties of the hydraulic oil. The numerical simulation of the flow
field in the hydraulic brake during recoil was performed in CFD software ANSYS Fluent. The simulation was made in a
2D numerical domain based on the flow geometry in 3D space. Due to the flow field boundaries movement during the
process, the dynamic mesh was employed. The dynamics of the hydraulic brake piston was determined using the solver
in which the forces that act on the gun are defined by the User Defined Function file. The experiment was performed by
firing from the 20mm M55 gun mounted on the stand. Experimental results contain pressure change in time inside the
brake which was measured by the piezoelectric pressure sensor. The dynamic behavior of the cannon was recorded by
the high-speed camera. The numerical results of the pressure change and position of the gun deviate within acceptable
limits with respect to experimental results. Based on that, further analysis of the influence parameters on the hydraulic
brake force can be done by numerical simulation.",
publisher = "Belgrade : Military Technical Institute",
journal = "9th International Scientific Conference – OTEH 2020, Belgrade, 8-9 October 2020",
title = "Analysis of the influence parameters on the pressure field in the hydraulic brake",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6053"
}

Jevtić, D., Micković, D., Elek, P., Marković, M.,& Jaramaz, L.. (2020). Analysis of the influence parameters on the pressure field in the hydraulic brake. in 9th International Scientific Conference – OTEH 2020, Belgrade, 8-9 October 2020
Belgrade : Military Technical Institute..
https://hdl.handle.net/21.15107/rcub_machinery_6053

Jevtić D, Micković D, Elek P, Marković M, Jaramaz L. Analysis of the influence parameters on the pressure field in the hydraulic brake. in 9th International Scientific Conference – OTEH 2020, Belgrade, 8-9 October 2020. 2020;.
https://hdl.handle.net/21.15107/rcub_machinery_6053 .

Jevtić, Dejan, Micković, Dejan, Elek, Predrag, Marković, Miloš, Jaramaz, Lana, "Analysis of the influence parameters on the pressure field in the hydraulic brake" in 9th International Scientific Conference – OTEH 2020, Belgrade, 8-9 October 2020 (2020),
https://hdl.handle.net/21.15107/rcub_machinery_6053 .

TY  - JOUR
AU  - Jevtić, Dejan
AU  - Micković, Dejan
AU  - Jaramaz, Slobodan
AU  - Elek, Predrag
AU  - Marković, Miloš
AU  - Živković, Saša
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3309
AB  - The change of gas parameters in the cylinder of the automatic gun has a great influence on the dynamics of the gun. Many factors have an influence on the gas parameters in the gas cylinder such as the diameter and position of the gas port, the initial volume of the gas cylinder, the gap between the piston and the cylinder, initial temperature of the cylinder parts, etc. The analytical model was made to analyze the parameters on which depends gas piston dynamics. The numerical simulation with CFD software ANSYS Fluent was performed to analyze the change of the thermodynamic properties of the gases in the cylinder, temperature change of the cylinder parts and dynamics of the gas piston. The experiment was performed to provide pressures in the barrel and the gas cylinder and velocity of the gas piston. The comprehensive comparisons between results obtained by the analytical model, the numerical simulation and experiments have been performed and good agreements were observed.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Modeling of gas parameters in the cylinder of the automatic gun during firing
EP  - 4145
IS  - 6
SP  - 4135
VL  - 24
DO  - 10.2298/TSCI200118152J
ER  - 

@article{
author = "Jevtić, Dejan and Micković, Dejan and Jaramaz, Slobodan and Elek, Predrag and Marković, Miloš and Živković, Saša",
year = "2020",
abstract = "The change of gas parameters in the cylinder of the automatic gun has a great influence on the dynamics of the gun. Many factors have an influence on the gas parameters in the gas cylinder such as the diameter and position of the gas port, the initial volume of the gas cylinder, the gap between the piston and the cylinder, initial temperature of the cylinder parts, etc. The analytical model was made to analyze the parameters on which depends gas piston dynamics. The numerical simulation with CFD software ANSYS Fluent was performed to analyze the change of the thermodynamic properties of the gases in the cylinder, temperature change of the cylinder parts and dynamics of the gas piston. The experiment was performed to provide pressures in the barrel and the gas cylinder and velocity of the gas piston. The comprehensive comparisons between results obtained by the analytical model, the numerical simulation and experiments have been performed and good agreements were observed.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Modeling of gas parameters in the cylinder of the automatic gun during firing",
pages = "4145-4135",
number = "6",
volume = "24",
doi = "10.2298/TSCI200118152J"
}

Jevtić, D., Micković, D., Jaramaz, S., Elek, P., Marković, M.,& Živković, S.. (2020). Modeling of gas parameters in the cylinder of the automatic gun during firing. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 24(6), 4135-4145.
https://doi.org/10.2298/TSCI200118152J

Jevtić D, Micković D, Jaramaz S, Elek P, Marković M, Živković S. Modeling of gas parameters in the cylinder of the automatic gun during firing. in Thermal Science. 2020;24(6):4135-4145.
doi:10.2298/TSCI200118152J .

Jevtić, Dejan, Micković, Dejan, Jaramaz, Slobodan, Elek, Predrag, Marković, Miloš, Živković, Saša, "Modeling of gas parameters in the cylinder of the automatic gun during firing" in Thermal Science, 24, no. 6 (2020):4135-4145,
https://doi.org/10.2298/TSCI200118152J . .

TY  - CONF
AU  - Jevtić, Dejan
AU  - Micković, Dejan
AU  - Jaramaz, Slobodan
AU  - Elek, Predrag
AU  - Marković, Miloš
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6056
AB  - Hydraulic brake is an important part of the artillery system because reliable amortization of
energy of the recoil parts depends on its functioning. Therefore, it is important to estimate time-dependent
pressure field inside the brake which depends on many factors, such as geometry of the brake parts,
velocity of recoil parts and physical characteristics of the oil that is used in the brake. During recoil and
counterrecoil process of the recoil parts of the artillery system, heating of the oil and the other parts of the
hydraulic brake occurs. In this paper the influence of the temperature change of the hydraulic brake parts
on the recoil force is analyzed. Since the hydraulic brake assembly is axisymmetric, the problem is
considered to be two-dimensional. Differential equations that describe flow field in the brake are solved
numerically using CFD software. A comprehensive comparison between numerical and experimental
results has been performed and good agreement is observed.
PB  - Society of Thermal Engineers of Serbia, Faculty of Mechanical Engineering in Niš
C3  - 19th Symposium on Thermal Science and Engineering of Serbia, Sokobanja, October 22-25, 2019
T1  - The influence of the temperature change on the force in the hydraulic brake of the artillery system
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6056
ER  - 

@conference{
author = "Jevtić, Dejan and Micković, Dejan and Jaramaz, Slobodan and Elek, Predrag and Marković, Miloš",
year = "2019",
abstract = "Hydraulic brake is an important part of the artillery system because reliable amortization of
energy of the recoil parts depends on its functioning. Therefore, it is important to estimate time-dependent
pressure field inside the brake which depends on many factors, such as geometry of the brake parts,
velocity of recoil parts and physical characteristics of the oil that is used in the brake. During recoil and
counterrecoil process of the recoil parts of the artillery system, heating of the oil and the other parts of the
hydraulic brake occurs. In this paper the influence of the temperature change of the hydraulic brake parts
on the recoil force is analyzed. Since the hydraulic brake assembly is axisymmetric, the problem is
considered to be two-dimensional. Differential equations that describe flow field in the brake are solved
numerically using CFD software. A comprehensive comparison between numerical and experimental
results has been performed and good agreement is observed.",
publisher = "Society of Thermal Engineers of Serbia, Faculty of Mechanical Engineering in Niš",
journal = "19th Symposium on Thermal Science and Engineering of Serbia, Sokobanja, October 22-25, 2019",
title = "The influence of the temperature change on the force in the hydraulic brake of the artillery system",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6056"
}

Jevtić, D., Micković, D., Jaramaz, S., Elek, P.,& Marković, M.. (2019). The influence of the temperature change on the force in the hydraulic brake of the artillery system. in 19th Symposium on Thermal Science and Engineering of Serbia, Sokobanja, October 22-25, 2019
Society of Thermal Engineers of Serbia, Faculty of Mechanical Engineering in Niš..
https://hdl.handle.net/21.15107/rcub_machinery_6056

Jevtić D, Micković D, Jaramaz S, Elek P, Marković M. The influence of the temperature change on the force in the hydraulic brake of the artillery system. in 19th Symposium on Thermal Science and Engineering of Serbia, Sokobanja, October 22-25, 2019. 2019;.
https://hdl.handle.net/21.15107/rcub_machinery_6056 .

Jevtić, Dejan, Micković, Dejan, Jaramaz, Slobodan, Elek, Predrag, Marković, Miloš, "The influence of the temperature change on the force in the hydraulic brake of the artillery system" in 19th Symposium on Thermal Science and Engineering of Serbia, Sokobanja, October 22-25, 2019 (2019),
https://hdl.handle.net/21.15107/rcub_machinery_6056 .