Numerical Investigation on the Impact Response of Rolled Homogeneous Armor (RHA) with Spall Liners

Abstract

The armor, on impact by a projectile, not only is pierced, but also generate debris which are known as spall. Liners are generally used to decrease the lethality of spall and increase the survivability of personal. The present numerical study investigates the spall generated by impact of an Explosively Formed Projectile (EFP) and Shaped Charge Jet (SCJ) on Rolled Homogeneous Armor (RHA). In the first part, the RHA was modeled using SPH method and different failure models were used to determine the spall parameters on impact by EFP. In the second part of the study, a series of simulations were performed to characterize the performance of liner materials (mono layer and multi-layer) and configurations in reducing spall generated by impact of EFP and SCJ. The introduction of liners greatly reduces the lethality of spall and the principle mechanisms aiding performance were identified. Liner performance is greatly dependent on the areal density, compressibility and strength of the materials used