超高速武器对地打击效应数值仿真

 以流体弹塑性模型为基础, 采用SPH 无网格方法, 对超高速武器打击花岗岩靶体进行数值仿真分析。结果表明:随着靶速度提高, 将依次呈现固体侵彻、半流体侵彻、流体侵彻3 种现象;出现流体侵彻后, 直接侵彻深度大幅减小并趋向固定值, 总弹坑深度增幅缓慢, 弹体前端形成静高压区, 并伴随以塑性冲击波为主的动应力区;亚音速流体侵彻应力波形为双波结构, 而超音速流体侵彻应力波形与空气冲击波类似为强冲击波, 但衰减指数>2.5, 且着靶速度越高, 衰减越快。

Numerical simulation of damage effect of hyper velocity weapon on ground target

The material is described by a fluid-elasto-plastic theory model, and the impact effects of HVIW are analyzed by SPH meshless method. The numerical simulation results are as follows. With impact velocity increasing, solid penetration, semi fluid penetration and fluid penetration are successively present. In the fluid penetration step, the direct penetration depth will substantially decrease and trend to constant, and the total crater depth will increase very little. Around the projectile front face a static high pressure field will form, accompanied by a dynamic stress wave filed mainly by plastic shock wave. A double wave shape will appear in subsonic fluid penetration, but a strong shock wave, similar to air blast, will appear in hypersonic fluid penetration. However, it attenuates rapidly, with an attenuation index up to 2.5, and the higher impact velocity, the larger attenuation index.