成层式防护结构抗超高速侵彻的数值分析

采用SPH算法，基于AUTODYN-2D开展了钨杆弹对4种"花岗岩遮弹层-（空气）干砂分配层-混凝土结构层"形式的成层式防护结构的超高速打击数值计算分析，得到了结构的破坏特征和能量分配情况。结果表明：（1）增加打击速度会加剧遮弹层和分配层的破坏程度，但在一定速度区间内结构层的侵彻深度反而随着打击速度的增加而减小；（2）结构层的能量分配比例具有随着撞击速度增加而减小的趋势，这可以初步归结为竖向冲击动能在遮弹层和分配层的横向传递；（3）一定条件下，通过增加空气隔层可以减小结构层的侵彻深度、结构层分配能量的比例和绝对值。

Numerical analysis on hypervelocity penetration into layered protective structure

In this study, based on SPH and using AUTODYN-2D, we analyzed the hyper velocity penetration of tungsten rod into four types of layered shielding structures consisting of granite shielding layer, air/sand distribution layer and concrete structure layer, and obtained the structures' damage and energy distribution, with the following results achieved:(1) Although raising the striking velocity increased the damage of the shielding layer and the distributing layer, the penetration depth into the structure layer decreased within a certain velocity range; (2) The ratio of the energy conducted to the structure layer generally decreased with increasing of the striking velocity, and this could be attributed to the transverse propagation of the impact energy within the shielding layer and distributing layer; (3) Under certain conditions, addition of an air layer could reduce the penetration depth into the structure layer, the ratio and absolute value of the energy conducted to the structure layer.