Numerical simulation of non-energetic reactive armors

Kurt, Mert Can
Non-energetic reactive armors (NERAs) are one type of reactive armors which are developed to reinforce main armors of heavily armoured vehicles. Non-energetic reactive armors also called as bulging armors are known to be effective against lethal effects of shaped charges. Their structures are like sandwich structures and consist of one intermediate layer between two outer metal plates. The intermediate layer is made of inert materials such as rubber or polymers. The intermediate layer and the outer metal plates are fundemental components of defensive mechanism of these armors. The principle of the mechanism depends on shock waves which are generated by the interaction of a shaped charge jet and the intermediate layer. When the shaped charge jet hits the intermediate layer, high pressure waves are generated which cause a localized bulging of the metallic layers. These metallic layers are accelerated by the shock waves and they distort the movement of the shaped charge jet. This thesis involves numerical simulations of the bulging armors and focuses on the investigation of high performance bulging armors (NERA-Non-energetic reactive armor). In this study, penetration of shaped charges into NERAs is simulated by using AUTODYN software. The simulations are performed in two consecutive steps which are respectively the formation of the jet and the penetration of the jet into the bulging armor. Two-dimensional multi material Euler solver of AUTODYN is chosen for the jet formation analysis. Then this jet is remapped to two and three-dimensional Lagrange solver for the jet penetration analysis. Critical material parameters of the intermediate layer that influence the performance of the armor are studied. 


3D Numerical simulation of nonenergetic reactive armor
Saeidi, Farid; Kurt, Mert Can; Gürses, Ercan; Çöker, Demirkan (null; 2015-09-12)
Non-energetic reactive armors also called bulging armors are known for their effectiveness against shaped charges. These composite structures consist of two metal plates and an intermediate non-metallic layer. Soft materials like rubber or polymers are often preferred for the intermediate layer. In this paper, interaction of shaped charge jet with bulging armor is studied and the eects of material parameters of the intermediate layer are investigated by using 3d numerical simulations.
Deniz, T.; Yıldırım, Raif Orhan (2013-04-26)
The change in ballistic performance of AISI 4340 steel plates with different thicknesses and varying hardness against 7.62 AP (Armor Piercing) projectiles is studied. Four different target plate hardnesses are chosen. The commercial hydrocode software ANSYS Autodyn is used in numerical studies. Johnson-Cook strength model parameters for the varying target plate hardness are calibrated from mechanical tests. The numerical simulation results using this model are confirmed by a series of experimental test resu...
Ballistic penetration of hardened steel plates
Deniz, Tansel; Yıldırım, Raif Orhan; Department of Mechanical Engineering (2011)
Ballistic testing is a vital part of the armor design. However, it is impossible to test every condition and it is necessary to limit the number of tests to cut huge costs. With the intro- duction of hydrocodes and high performance computers; there is an increasing interest on simulation studies to cutoff these aforementioned costs. This study deals with the numerical modeling of ballistic impact phenomena, regarding the ballistic penetration of hardened steel plates by 7.62 mm AP (Armor Piercing) projectil...
Experimental analysis and wear modeling for mechanical components of a typical rail launcher
Akkök, Metin; Acmaz, Emre (2013-08-30)
One of the most important design considerations for rocket launchers is its maintainability and one of the most important parameter which affects the maintainability is wear in launchers. Therefore, for predicting the life-time of a launcher, wear should be investigated beside other parameters such as fatigue etc. In this study, experimental and modeling of dry sliding wear in some mechanical parts of a typical rail launcher, used in helicopters, were made. Firstly, measurements about the material loss, whi...
Response of Alumina/4340 Steel Laminated Composites against the Impact of 7.62 mm Armor Piercing Projectiles
DEMİR, TEYFİK; Ubeyli, Mustafa; Yıldırım, Raif Orhan; Karakas, M. Serdar (2009-01-01)
Laminated composite armors provide significant advantages to the defense systems when considering both the mobility and energy consumption. Among them, alumina faced laminated composite systems have been considered as strong candidates due to their relatively low cost and availability. In this study, the ballistic response of alumina/4340 steel laminated composites was investigated under the impact of 7.62 mm armor piercing (AP) projectiles. The influence of the mechanical properties of the steel backing la...
Citation Formats
M. C. Kurt, “Numerical simulation of non-energetic reactive armors,” M.S. - Master of Science, Middle East Technical University, 2017.