贴隔板法在尾翼EFP成型中的应用研究

The Application Study of Affixed Cover in Forming Process of EFP with Fins

采用LS-DYNA对在药型罩上粘附隔板结构形成带尾翼型爆炸成型弹丸(explosively formed projectile,EFP)进行三维数值模拟,从药型罩微元压跨速度和压力的角度初步探讨了形成尾翼型EFP的机理,对同一直径的大锥角型、球缺型和弧锥结合型药型罩形成的尾翼型EFP进行了对比分析,三种结构药型罩均能形成较为明显的尾翼,其中大锥角型药型罩得到的EFP速度最高。数值计算结果表明,EFP尾翼数与药型罩上所粘贴的隔板数一致,三种不同结构药型罩上粘贴四个隔板,得到的尾翼数均为四个。通过实验,对贴隔板法形成尾翼EFP做了进一步验证,实验结果与数值模拟结果基本一致。

The explosively formed projectile（EFP） with fins for a cover charge structure by LS-DYNA software which four covers were eonglutinated on the liner was studied by three-dimensional numerical simulation. The mechanism of forming EFP with fins was discussed based on the curves of velocity and pressure vs time of the liners. A contrastive analysis was carried out on the three kinds of liners which include big-cone shaped liner,imperfect-sphere shaped liner and arc-cone shaped liner. Results show that three kinds of liners can form obvious fins and the velocity of the big-cone shaped liner is the fastest. The experimental results agree with the simulational results basically.