Numerical Simulation of Debris Cloud Characteristics Behind EFP Projectile Target
In order to explore the after-effect debris cloud characteristics of explosionally-formed projectile ( EFP) with densehead and small aspect ratio,the FEM-SPH algorithm was used in this study to analyze the debris cloud formation process of EFP simulated projectile with an aspect ratio of 1.2 in red copper and nickel alloys. The study found:the fragment cloud after penetration of a projectile with a small aspect ratio presents an elliptic structure composed of tiny projectiles and fragments of the target plate. The increase of projectile size and penetration speed leads to the formation of more and higher fragment clouds behind the target. The residual nickel alloy projectiles exist in the head of the fragment cloud in an upset shape,causing sec-ondary penetration of the target,while the red copper fragments have a greater degree of fragmentation. To form a large area of damage to the aftereffect target,when the projectile density is constant,the strength of the target plate mainly affects the axial expansion ability of the debris cloud,and for different projectile target materials,the radial expansion ability of the debris cloud mainly depends on the density ratio ρb . The research conclusion is of great significance to the design of EFP warhead's after-effect power.
万方数据
维普
