物质点法在爆轰波碰撞炸药猛度试验中应用

使用常规有限元法对炸药爆轰过程进行数值计算时,网格大尺度畸变,往往导致求解精度低,甚至求解失败的情况.采用同时兼顾拉格朗日方法和欧拉方法优点的物质点法(MPM)对爆轰波碰撞炸药猛度试验进行数值计算,得出爆轰波碰撞过程及其在铅柱中传播的应力、应变分布.与试验结果进行对比得知,铅柱压缩误差仅为0.17%.由此验证了物质点法在炸药猛度试验应用中的准确性,为爆轰波传播、碰撞过程分析及炸药猛度测试提供了一种新方法.

Application of material point method to explosive brisance tests with detonation wave collision

Due to the large-scale grid distortion, it always leads to low precision, even making solution fail when using the conventional finite element method to simulate the detonation process. The material point method (MPM), which combines the advantages of Lagrange method and Euler method, is applied to simulate the detonation wave collision in explosive brisance tests. The detonation wave collision is reproduced, and the stress and strain distributions in lead cylinder are obtained. Compared with the experimental results, the compression error of lead cylinder is only 0.17%, which verifies the good accuracy of the material point method used in explosive brisance tests. It provides a new approach for the research of detonation propagation and collision process as well as explosive brisance tests.