着角与攻角联合作用下薄芳纶层合板抗平头弹侵彻性能OA北大核心CSTPCD

A 3D finite element(FE)simulation model was built to investigate the synergistic effects of impact and attack angles on the penetration resistance of relatively thin aramid laminates to flat-noded bullets.Two scenarios of the impact responses of a 4-mm-thick aramid laminate were calculated,i.e.,considering the im-pact angle alone and considering the impact and attack angles together.The penetration resistance of the aramid laminate was reflected by the residual velocity of the bullet,the ballistic limit velocity and the perforation ener-gy threshold of the target plate.Deformation and damage mechanisms of the laminate under different impact conditions were also analyzed.The main findings are:(ⅰ)the ballistic limit velocity decreases and then increases with the initial impact angle;(ⅱ)with the increasing impact velocity and the decreasing initial impact angle,the changes of the impact angle and the attack angle both tend to decrease;(ⅲ)for a fixed impact angle,a negative attack angle is not conducive to penetration,but a positive attack angle is conducive to penetration.