双层药型罩内罩开槽对EFP形成尾翼的影响❋

摘要

[ ABSTRACT] In order to study the influence of inner liner with grooves in circumferential symmetryon double-layer shaped charge forming explosively formed projectile( EFP) with fins, the formation process of shaped charge assembled with double-layer liners was simulated by using finite element software LS-DYNA and Lagrange algorithm. Numerical results of grooves in different sizes on inner liner were analyzed, and the optimized result was selected for experimental studies. Simu-lated results are in good agreement with experiments. It is shown that the double-layer liners with grooves on inner liner can form EFP with fins. When L/Da =0. 2 and W/Da =0. 05(Da is the charge diameter,L is the length of groove, and W is the width of groove) , the length-diameter radios of the front and the back EFP are the largest, and the formation of tandem EFP with fins is the best.%为了研究内层药型罩周向对称开槽对爆炸成型弹丸( EFP)形成尾翼的影响,利用LS-DYNA显示动力分析有限元程序,采用Lagrange算法,对双层药型罩聚能装药的成型过程进行数值模拟。对不同开槽参数的数值模拟结果进行对比分析,选择数值模拟最佳结果进行试验验证。数值模拟与试验研究所得结论基本吻合。结果表明：内层药型罩周向对称开槽结构能够形成带尾翼的串联EFP。当L/Da ＝0.20、W/Da ＝0.05时( Da 为装药直径,L为开槽长度、W为开槽宽度),前后EFP长径比最大,带尾翼的串联EFP的成型效果最佳。