Parametric Design And Applied Research On The Shells Used To Penetrating The Walls

In anti-terrorism operations and all kinds of emergency situations, it is very necessary to remove obstacles of the building doors or walls in an instant. So personnel responsible for security can quickly enter the room. Portable shaped charge shells has the advantage of small size,light weight,well penetration effect,safety of usage. Combined use of several such shells can effectively get rid of brick wall barriers. The small shells can be equipped with the anti-riot police,special forces.Shaped charge jet penetration of metal and non-metallic media is widely used in the military,engineering,and civilian aspects of blasting, such as the large linear shaped charge cutter,perforator of shaped charges in the exploitation of petroleum,tandem warhead system,light projectiles and so on. With hydrodynamic models and simulation software, we can calculate the gradient of speed within a Shaped Charge Jet,mass distribution,shape and size. Because of complexity of shaped charge, there is no satisfactory general theory of detonation driven liner. Research on shaped charge mainly focused on aspects of optimizing and improving performance. The numerical methods are widely used in structural design of shaped charge,optimization,material selection and so on.This paper tried to describe the basic theory of the shaped charge and research results at home and abroad. penetration through walls of various target media has been simulated with finite element analysis software of ANSYS/LS-DYNAl1.0.In this process we use multi-material ALE algorithm,three-dimensional solid element mesh,elastic and plastic dynamics material model,the Johnson-Holmquist Constitutive Model (JH-2).Constants are obtained for the model using existing test data which include both laboratory and ballistic experiments. We get formation of the jet and the pestle body,penetration,accumulation,broken walls. Through comparing the simulation results and theoretical results one by one. We Optimized the diameter of the shells,the height of explosive,quality of the charge. In cases with good penetration results, we ensure that the shell has the highest efficiency of jet utilization,reasonable charge structure,the quality of a minimum charge,Minimum size. The shells has convergence c-4 explosives,cone-shaped charge liner made up of copper,nonel tube detonator. We choose three different kinds of shells, their cone angle is respectively 60°,90°,120°.Two sets of single-shell experiments have been conducted, which is mainly used for testing the depth of penetration,cracks of the wall and Providing data for the combination experiments. In the process of the combination experiment, eight shells was a circle arrangement on the wall, there has a certain quality of explosives in the middle of circle, the explosives locate at the top of the wall and has a certain distance from the wall. It use of water as a pressure transmission medium. According to penetration effects, we modify the shells location,spacing.