Numerical Studies Of Ceramic/Metal Composite Armours Against Penetration And Secondary Debris For High Velocity Impact

There were two parts in this paper. First, the operational objective in this paper was the problem of kinetic projectile penetrating ceramic/metal composite armours, using LS-DYNA to analysis and calculate, validating its feasibility through comparing with the experimental data in existence. Secondly, a couple of numerical calculations using dividing the target nodes and defining tied node sets with failure to simulate the generated process of the secondary debris and the debris penetrating the behind target were performed and compared with the corresponding SPH numerical results. Both results indicated fairly good agreement with each other. The details of content were as following:1) The paper maked a general introduction about the research method and advancement of penetration, and summarized the numerical simulation algorithm of penetration detailedly,which established foundation for the following work.2) The numerical simulation of projectile penetrating the ceramic/metal composite armours were studied, and the numerical results corresponded well to the experimental results. The effects of the thickness of ceramic target and the projectile nose shapes on penetration were discussed with the calculated results. The energy absorption of ceramic and metal targets were divided into two parts: kinetic energy and internal energy, and analyzed the process of penetration through the energy absorption of different parts.3) The projectiles penetrating the ceramic/metal composite armours with yaws were simulated, and the influence of yaws and impact velocities on penetration were discussed with the calculated results.4) The generated process of the secondary debris and the debris penetrating the behind target were simulated using dividing nodes method, the calculated results agreed with the SPH numerical results well which showed that the method of this paper was feasible.The research results indicated that using numerical simulation method to study the problem of projectile penetrating the ceramic/metal composite armours was feasible,and dividing nodes method could simulate the generated process of the secondary debris.The interrelated conclusions of this paper can offer reference for farther research and engineering design.