Simulation Study on EFP with Stable Tail Fins Formed by Polygonal Shaped Charge Liner

Abstract

To ensure the flight stability of a modern explosively formed projectile (EFP) with a high standoff distance, the feasibility of forming an EFP with a high length-to-diameter ratio (L/D) by a polygonal charge liner was investigated by using a three-dimensional simulation. The results revealed that an optimal EFP structure with a large L/D and stable tail fins could be achieved when using 0.8De (diameter of liner circumcircle) as the outer curvature of the thickness-varying hexagonal hemispherical liner, 0.0325De as the top thickness, and 0.2 as the bottom-to-top thickness ratio. However, when the number of edges was more than 12, the tail fins would start to transition to pleated fins and become more prone to fracturing.