A3钢钝头弹撞击45钢板破坏模式的数值分析

不同速度范围内的A3钢钝头弹撞击45钢靶板分别表现为泰勒撞击、向日葵型花瓣帽形失效和靶板冲塞穿甲等3种不同的破坏模式，利用LS-DYNA对这种复杂的破坏机理和相应的影响因素进行了数值模拟研究。采用Johnson-Cook强度模型和累积损伤失效模型描述弹靶材料的力学性能，并考虑了塑性变形的绝热温升效应。数值模拟再现了不同破坏模式的失效过程，得到了与实验一致的结果。研究还指出，弹靶的冲塞穿甲实际是在高速撞击下，弹体发生花瓣帽形变形失效后继续穿甲靶板的后续结果。

Simulations of A3 steel blunt projectiles impacting onto 45 steel plates

Three failure modes of penetration mechanisms,i.e.,Taylor impact,petal-cap failure of Sunflower alike and plugging perforation, of Fragment Simulation Projectiles(FSP),were observed in the experiments of A3 steel blunt projectiles impacting 45 steel plates.Numerical simulations with LS-DYNA was conducted to analyze the various penetration mechanisms and the complicated material failures of projectile and target.Johnson-Cook models of strength and damage-cumulating failure were employed to describe the material behaviors of projectile and target,and adiabatic temperature-rise of local plastic deformation was included in the model.Different failure modes of projectiles and targets reappear in the numerical simulations in the different ranges of impact velocity,which agree well with the experimental observations.It further indicates that the failure mode of plugging perforation is the subsequent result of continuous perforation of projectile after petal-cap failure of Sunflower alike under higher velocity impact.