尖头弹丸贯穿金属靶板的过载分析及仿真

研究了刚性尖头弹体贯穿塑性金属靶板的冲击力学特性,将侵彻过程分为三个阶段,利用圆柱形空腔膨胀理论得到了锥形和卵形弹在各阶段的过载的表达式。采用非线性有限元软件LS-DYNA建立了尖头弹侵彻的仿真模型。对两种弹体以相同初始速度贯穿钢靶板进行了理论和仿真计算,用所得弹道极限速度和剩余速度结果与试验数据做了对比,显示三者一致性较好。通过理论和仿真计算得出了两种弹体侵彻三种厚度钢靶板的过载变化规律。为小尺寸装药的侵彻过载特性评估方法的建立提供了理论参考和分析方法。

Analysis and Simulation on Deceleration Characteristic of Perforation into Metallic Plates by Rigid Sharp-nosed Projectiles

The impact mechanical characteristic of projectiles perforating plastic metallic plates was studied.Based on cylindrical cavity-expansion theory,a new engineering model with taking into account three interconnected perforation stages was proposed.Formulas of perforation deceleration for conical and ogival nosed projectiles were derived.Numerical simulations were carried out using the non-linear finite element code LS-DYNA.Ballistic limit and residual velocities of two sharp-nosed projectiles into steel plates were calculated by using new model and simulation.The analytical and numerical results were compared to the experimental findings,and good agreement was in general obtained.The deceleration characteristics and changes of sharp nosed projectiles into12mm,20mm and 30mm thickness steel plates respectively were analyzed.Theoretic reference and analytical method were provided for deceleration characteristic evaluation of sharp-nosed projectiles and small size charges.