锥角对具有PELE效应的EFP成型影响的数值仿真分析

Numerical Simulation Analysis of the Influence of Cone Angle on EFP Forming with PELE Effect

为增强反轻型装甲目标弹药的毁伤能力,提出了一种内含低密度装填材料的变壁厚弧锥结合药型罩。使用有限元软件LS-DYNA分析了各锥角对爆炸成型弹丸(EFP)成型的影响规律和EFP对靶板的侵彻效应,拟合得到EFP成型参数曲线与EFP成型速度的曲线方程。结果表明,药型罩内锥角α_1取166°～170.2°,装填物内锥角α_2取160°～166°,装填物外锥角α_3取140°～152°,药型罩外锥角α_4取132°～140°时EFP成型速度较快、成型效果较好;α_3对EFP成型速度、长度与径向尺寸影响最大,α_1,对EFP中心厚度影响最大。基于研究结果对药型罩结构进行优化,优化后的药型罩能够形成具有明显横向效应增强型侵彻体(PELE)效应的EFP,在射入靶板时对其扩孔,并在穿透靶板后碎裂形成高速破片对目标内部进行二次毁伤。

To enhance the damage effectiveness of anti-light armor target ammunition,a kind of variational-wall-thickness arc-cone liner with low-density loading material was proposed.The influence law of each cone angle on explosively formed projectiles(EFP)forming and the penetration effect of EFP on target plate were analyzed by finite element software LS-DYNA.The curve of EFP forming parameters with each cone angle was obtained by fitting.Results show that when the inner cone angle α1 of liner takes 166°-170.2°,the inner cone angle α2 of filler takes 160°-166°,the outer cone angleα3 of filler takes 140°-152°,the outer cone angleα4 of liner takes 132°-140°,the EFP forming speed is fast and forming effect is good.Theα3 has the greatest influence on the forming speed,length and radial dimension of EFP,and theα1 has the greatest influence on the center thickness of EFP.Based on the research results,the structure of the liner was optimized.The optimized liner can form an EFP with distinct penetrator with enhanced lateral efficiency(PELE)effect,which expands the hole when penetrating the target plate and forms some high-speed fragments in the target interior to cause secondary damage after penetrating the target plate.