对爆炸成型弹丸(EFP)成型和侵彻的数值模拟采用两种解决方法,一是将成型和侵彻分两步计算,二是采用ALE法模拟整个成型及侵彻过程.采用纯Lagrange法对此进行数值模拟,将炸药、药性罩和靶板建成一个完整的计算模型,借助LS-DYNA中重启动技术,计算成型时删除靶板部分和侵彻时删除炸药部分.模拟结果得到的EFP外形和侵彻效果与实验结果基本吻合,验证了该计算方法的可行性.重启动技术可以对多个物理过程进行纯Lagrange法计算,可直观重现物质变形引起的网格变形.
There are two solutions of numerical simulation in forming and penetration of explosively formed projectile. One is to divide forming and penetration into two steps,the other is to simulate the whole forming and penetration process by Arbitrary Lagrange?Euler. Pure Lagrange method was first put forward and used in this study. A complete computational model including explosive,liner and target,was established. The target part was deleted in forming simulation,and the explosive part was deleted in penetration simulation by means of restart technology in LS?DYNA. The simulation results of EFP shape and penetration effect approximately agree with the experimental data,which verifies the feasibility of the method. Pure Lagrange method could solve the simulation problem in multiple physical processes if restart technology is used,and mesh morphing caused by material deformation can be reproduced.
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