| Evaluting kill effect is one of the critical parts to design bullets,and it has important influence on equipment and optimal design, the structural design of the protective material is closely related to kill power. Given the application demands of the design of body armour and the evaluation on kill effect,the numerical simulation of the projectile penetrating into ceramic composite and gelatin target is taked.There are two parts in the paper.one is to study the factors of effect on bullet penetration ability. It is the one of the keys to how to improve the design of the bullet with greater lethality. The other is the study of influence factor on ballistic performance of the composite protective.As a result of pressure waves exist, Behind armour blunt trauma still exist. The analysis on influence factor of composite protective ballistic performance can provide reference for protection optimization design.In this paper,taking noninear explicit dynamics as the foundation, based on Ansys/LS-DYNA,the numerical model of spherical projectiles penetrating soft armour is created,the simulation results are consistent with those from the experiments,this consistence validates the simulation model.Based on the conclusions,the finite element model of the rifle bullet impacting the composite armour that composed of ceramic high polyethylene flapper, soft target of police protection and gelatin is created,the rules of velocity and acceleration change, the ceramic cone formation mechanism and evolution are researched, energy changes on penetration process are calculated. The effect of projectile and protection parameters in the penetration as well as the protective effect is studied, and the speed of projectile, the thickness of the protective layer and the core materials are taken into account in detail. The influence of the parameters on the protection performance and pressure of simulation muscle target behind protection are summarized,to provide a reference for future research work. |
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