Formation and penetration of PELE/EFP multi-mode warhead based on double-layer shaped charge

The outer layer of a double-layer shaped charge (DLSC) adopts high-detonation-velocity explosive (HE) and the inner layer adopts low-detonation-velocity explosive (LE). Compared with ordinary shaped charge (OSC), it changes the incidence angle of detonation wave on liner and improves the detonation pressure. According to different battlefield targets, the multi-mode warhead selects corresponding projectiles, when penetrator with enhanced lateral efficiency (PELE) penetrates a light armor, it can break into a large number of fragments behind target to enhance aftereffect damage. Explosively formed projectile (EFP) is used to penetrate long-distance heavy armors, the performance indexes of EFP are penetration depth and opening diameter. This article establishes a mathematical model of PELE/EFP in DLSC and studies the terminal damage effect of PELE/EFP through numerical simulation and experiment. The results of theoretical analysis, numerical simulation and experimental research are consistent. The results show that when a DLSC is applied to PELE/EFP multi-mode warhead, the overall damage performance of PELE/EFP is greatly improved compared with an OSC. The dispersion radius of effective fragments behind target is increased by 32.6%, the number of fragments is increased by 78.67% and the penetration depth is increased by at least 107.8%.