环起爆位置对EFP成型的影响

针对环形起爆网络在多模成型装药上的应用问题,利用LS-DYNA仿真软件,通过改变环起爆位置,研究了起爆环距离药型罩的轴向距离和起爆环半径对形成侵彻体的速度、长径比等参数的影响规律.分析结果表明,起爆环半径对EFP成型的影响比较大,当起爆环半径从0倍增加到0.5倍装药口径时,EFP头部速度提高了37%,长径比增加了6.6倍;当起爆环到药型罩的轴向距离从0.34倍装药口径减小到-0.06倍装药口径时,侵彻体速度减小了42.7%,长径比降低了72.6%.数值模拟结果与脉冲X光摄影试验结果吻合较好,仿真与试验结果表明侵彻体速度和长径比与起爆环到药型罩的距离和起爆环半径分别呈线性变化和抛物线规律变化.

Effect of Annular Initiation Position on Formation of EFP

Aiming at the problem of annular initiation circuit applied on multimode shaped charge,the effects of the axial distance from Initiation Annulus(IA) to liner and the radius of IA on the formation parameters of penetrator,such as velocity and length-diameter ratio,were studied by using LS-DYNA software.The analysis result shows that the effect of IA radius on EFP formation is great.When the IA radius increases from 0 to 0.5 times the charge caliber,the velocity of penetrator improves by 37%,and the length-diameter ratio increases by 6.6 times.When the axis distance from IA to liner varies from 0.34 to-0.06 times the charge caliber,the velocity of penetrator decreases by 42.7%,and the length-diameter ratio decreases by 72.6%.The simulation results agree well with the X-ray imaging experimental results.The simulation and experimental results show that the velocity of penetrator changes linearly with the distance from IA to liner and IA radius,and the length-diameter ratio changes parabolically with them.