Study on Formation of EFP with Fins of Hexagonal Liner

Abstract

In order to further improve the flight stability of explosively formed projectile, the formation method of tail EFP was studied based on the polygonal liner. Under the hexagonal charge structure, the tail fins EFP can be formed when the structural parameters are matched. Through the numerical simulation of LS-DYNA, the influence of the structural parameters of the liner (curvature radius, linear thickness), charge height and shell thickness on the velocity, length-diameter ratio, compactness and wing-diameter ratio of the tail fins EFP was analyzed. In order to make the tail fins EFP performance better, the optimal range of radius of curvature R of hexagon liner is 0.75D ~ 0.85D, liner thickness t is 0.05D ~ 0.06D, charge height L is 0.8D ~ 1.0D, and the optimal range of shell thickness h is 0.06D ~ 0.1D.