Small-bore Armor-piercing Explosive Shells Penetration Goals Numerical Simulation Research

In order to provide a reference for optimization design of a small armor-piercing high-explosive projectiles and fuze, projectiles with different head structure contacting different target at different impact angle and impact velocity was simulation by LS-DYNA. The different conditions projectile penetration capability, penetrating safety of explosive charge and set-forward overload were analysised.The projectile deformation and mass loss, the curve the residual velocity and the residual energy after the penetration from simulation obtained that the shell damage, the residual velocity and the residual energy of the bomb after the penetration is much more affected by the head structure. The armor penetration capability relating to false ogive thickness and material. The design should be reasonable thickness, should try to use small density and high strength materials as false ogive material. The projectile body nose shape and size optimization design can increase the projectile armor penetration capability. When the projectile body nose is truncated cone, the residual kinetic energy of projectile improved5.3%after penetration target plate. The projectile body nose shape to impact penetration strength, which the worst is shape-pointed, the next is truncated-conical;the optimization is truncated cone with step shape. As the angle increases, the residual kinetic energy of projectile is more and more small. When the impact angle is up to a certain value, the projectile will ricochet. Add tungsten alloy penetrating block in the projectile body head can increase projectile penetration capability. The penetrating thickness can be increased about20%when projectile mass unchanged and the effect is more obvious when penetrating thickness become thicker.The process of a small caliber artillery armor-piercing high-explosive projectile penetrating homogeneou steel plate was simulation by LS-DYNA. The effect of the projectile angle of attack, velocity and thickness of armor target to safety of charge was obtained.The results indicated that the penetrating safety of explosive charge becomes worse with increased impact velocity. The penetrating safety of explosive charge is worse when70angle or80angle than0angle. The penetrating safety of explosive charge is threaded when large impact angle. The penetrating safety of explosive charge is not safe when target plate was increased to a certain thickness.The set-forward overload curves of obtained from simulation of the projectile contacting target indicated that the projectile set-forward overload results indicated that the maximum set-forward overload as the impact angle increases, but its relative to the velocity of projectile maximum set-forward overload should be smaller. The projectile with tungsten alloy block occurs when the two peaks, the case occurs when tungsten alloy armor block and the projectile impact target plate, design of fuze should consider the implications of this case.