填充物对组合式MEFP战斗部的弹丸成型影响研究

Study on the effect of fillers on the projectile forming of combined MEFP warheads

为了保证轴向组合式MEFP战斗部子装药之间不发生殉爆,选用聚乙烯、尼龙、聚氨酯和铝四种隔爆材料作为MEFP战斗部内部填充介质.运用显式动力学分析软件LS-DYNA对EFP弹丸成型情况进行数值模拟研究,分析子装药之间填充不同材料介质时,所形成的中心与周边EFP的头部速度、长径比以及发散角的变化情况.研究表明:采用铝作为填充材料时,MEFP头部速度最高;采用聚氨酯作为填充材料时,MEFP长径比最大,周边EFP发散角最小.通过与前人试验对比,得到聚氨酯作为隔爆材料时,数值模拟结果与真实试验结果相比误差不大于10.3%.

In order to ensure that the sub charges of axial combined MEFP warheads will not be subject to sympathetic explosion,this paper selects polyethylene,nylon,polyurethane and aluminum as the internal filling medium of MEFP warheads.It also uses the explicit dynamics analysis software LS-DYNA to conduct numerical simulation on EFP projectile forming,and analyzes the changes of the tip velocity,length to diameter ratio and divergence angle of the center and surrounding EFP formed when different materials are filled into the sub charges.The results show that MEFP has the highest tip velocity when aluminum is used as the filling material.When polyurethane is used as the filling material,the length to diameter ratio of MEFP is the largest,and the divergence angle of the peripheral EFP is the smallest.Compared with previous tests,when polyurethane is used as the flameproof material,the error between the numerical simulation results and real test results is not more than 10.3%.