铝铜药型罩射流与侵彻数值模拟

According to the character of jet formation in shaped charge device, a new type of charge assembly, with metallic liner of aluminum-copper bond fabricated by explosively welding technique, has been proposed in order to acquire the improvement on penetration capability from such charge. The device is modified from the available conical shaped charge with single copper liner material and 42° conical apex angle. Multi-material arbitrary Lagrangian-Eulerian (MMALE) method in LS-DYNA software package is employed as the numerical simulation tool to fulfill the calculations for the whole processes involving jet formation and ensuing penetration into target. Charges with apex angles varying from 36°, 38°, 40°, and 42° respectively have been calculated for comparison. The results show that the head velocity of the jet increases with the decreasing value of apex angle. Furthermore, 38° apex angle charge reaches maximum penetration depth. Compared to shaped charge with single copper liner, such design of the charge presents 13.2% improvement in jet head velocity and 14.5% rising in penetration depth.