Study on the Penetration of Semi-Infinite Thickness Metal Target by Heterogeneous Long Rods with Incident Velocity 1800-3000 M/S

A kind of heterogeneous long rod with gradient change material strength and density along the axis of the projectile was proposed. The penetration performance of the heterogeneous long rod on the semi-infinite thickness 6061-T651 aluminum target with incident velocity at 1800-3000 m/s was studied theoretically and numerically. A constitutive relation includes the effect of strain hardening and strain-rate sensitivity was used to describe the character of the target and the penetration process was numerically simulated by LS-DYNA finite element code. The penetration performance of the heterogeneous long rod with incident velocity 1800-3000 m/s was analyzed. The results show that: the theoretical predications are well accord with the numerical simulation results; the heterogeneous rod shows a better penetration performance than the homogenous rod with small strength in incident velocity field 1800-3000 m/s, but just in incident velocity field above 2850 m/s for homogenous rod with high strength.