起爆方式对LEFP成型及侵彻影响的数值模拟研究

为获得在大炸高条件下具有良好飞行形态的线性爆炸成型弹丸(LEFP),该文主要利用通用有限元软件LS-DYNA3D,采用任意拉格朗日欧拉(ALE)算法,对在多棱和单棱线性起爆方式下的药型罩成型过程进行了数值模拟.对比两种起爆方式下LEFP头部和尾部的速度-时间曲线、药型罩各微元的速度梯度及断面形态,并且在5倍装药口径炸高下,进行了两种起爆方式的侵彻威力仿真.结果发现在多棱线性起爆方式下LEFP具有良好的外形和更强的侵彻威力,多棱线性起爆形成的LEFP侵彻威力相对单棱线性起爆的增益为5.2%以上.

Numerical Simulation on Formation and Penetration Effect of LEFP by Blast Ways

The purpose is to obtain a linear explosively formed projectile (LEFP) with a good flying form under large standoff. The LS-DYNA3D finite element analysis software and the arbitrary Lagrangian-Eulerian(ALE) algorithms are used to simulate the forming process of shaped charge liner initiated by more ridges and a single ridge. The head and trail axis speed-time curves of LEFP, speed grads of every liner curvature particulate and section forms under these two different blast ways are compared. The penetration power under different blast ways is simulated with a five-time charge caliber. The calculated results show that the LEFP initiated by more ridges has better shape and great penetration power. The penetration power of LEFP initiated by more ridges is 5.2 % higher than that by a single edge.