基于夹层装药的水下EFP成型影响因素分析

Analysis of Influencing Factors of Underwater EFP Forming Based on Sandwich Charge

为了研究夹层装药结构对水下爆炸成型弹丸(EFP)成型过程的影响规律,运用AUTODYN软件对不同夹层装药结构的EFP水下成型过程进行了数值仿真与分析,分析结果表明:随着水介质中空气炸高的增大,夹层装药的成型速度和长径比逐渐增大,随着外层装药顶部宽度的增大,药型罩设置处各高斯点的压垮速度差减小,成型速度衰减较缓慢,在水介质的影响下,其长径比越来越小。在水介质中采用夹层聚能装药可以减少水介质对EFP成型过程的影响,提高EFP的成型速度,改善成型姿态。文中工作可为提高EFP水中爆炸威力提供参考。

To study the influence of a sandwich charge structure on the underwater explosively formed projectile(EFP)forming process,a numerical simulation and analysis of an underwater EFP forming process of different sandwich charge structures were conducted using AUTODYN.With an increase in the air blast height in water,the forming speed and aspect ratio of the composite charge increased,and with an increase in the top width of the outer charge,the crushing speed difference at each Gaussian point of the charge hood decreased and the forming speed dropped gradually.Under the influence of water,the aspect ratio became increasingly smaller.A sandwich charge in water can reduce the influence of water on the EFP forming process and improve the EFP forming speed and posture.This study provides guidance for improving the power of EFPs in water.