雷弹入水冲击动态缓冲性能分析

Exploring Analysis of Dynamic Cushioning Properties of Water-Entry Missile's Shock Mitigator

缓冲器可以减少和控制雷弹入水冲击载荷,提升空投雷弹的耐撞性和安全性。文中引进聚氨酯泡沫塑料在冲击加载条件下的本构关系式,代替传统的EPRC三段式经验模式,同时,为了满足整个时域的连续性和可计算性,对本构关系式进行相应的修正,然后参与雷弹入水冲击运动方程的数值计算。算例分析了垂直姿态入水情况下缓冲器的动态缓冲性能,同时分别对不同泡沫塑料的密度和入水速度下的缓冲效果进行分析,最后给出具有不同外型参数雷弹的入水冲击载荷规律。分析结果表明:与传统的经验方法相比,文中方法更符合实际情况,简便且通用性强,可以用于雷弹入水冲击的耐撞性结构设计和分析。

Aim.Having pointed out that past research relies too much on empirical data,we try to explore what we believe to be a better method through somewhat more theoretical analysis.Sections 1 through 3 of the full paper explain in some detail the better method we explored.Its core consists of:(1) we utilize a constitutive relationship to express the stress-strain responses of high-density PUR(polyurethane) foams under uniaxial compression loading conditions;(2) we modify the constitutive relationship and derive e...