阶梯式双层EFP成型及侵彻性能数值模拟

Numerical simulation on formation process and penetration of stepped double-layer EFP

为了提高爆炸成型弹丸(EFP)对装甲目标的毁伤效能,提出了一种双层阶梯型聚能装药结构,在大炸高条件下,可实现对移动目标的多孔毁伤效应。通过分析双层阶梯型EFP成型过程,发现研究设计的双层阶梯型聚能装药结构可形成分离式双层旋转EFP,基于该设计方案的可行性,进一步研究了药型罩结构参数对双层旋转EFP成型特性的影响规律和对移动目标的侵彻效能,发现装药长径比取值在1.5~1.6,内外罩壁厚取值在5~5.5 mm,曲径比在0.96~1.38时,EFP成型效果较好;且当炸高大于10 m时,成型EFP可实现对移动装甲目标的双开孔效应。

In order to improve the damage efficiency of the explosive formed projectile(EFP)to an armored target,a stepped double-layer charge structure which can lead to multi-pores damage effect under large standoff distance condition was proposed.It is found that the proposed structure can form separate double-layer rotating EFP after analyzing its forming process.Based on the feasibility of the design,the influence of the structural parameters on the forming characteristics of double-layer rotating EFP and the penetration performance of moving target were further studied.It can be concluded that the desired formation of EFP can be achieved when the ratio of length to diameter of charge is between 1.5~1.6,the thickness of inner and outer cover is between 5~5.5 mm,and the ratio of curved diameter is between 0.96~1.38.The forming EFP can realize double punching effect on the moving armor target when the standoff distance is larger than 10 m.