Numerical Simulation on Forming of Triple-Layer Tandem EFP

Abstract

The multi-layer tandem EFP warhead is one of the new concept warheads in the context of attacking new armor, such as composite armor, explosive reactive armor and soon. In this paper, a triple-layer sub-caliber hemispherical liner warhead is designed, and the forming process is studied by using ANSYS / LS-DYNA simulation software. Taking the velocity of the EFP and the length to diameter ratio as the performance indexes, the effect law of penetrator formation with structural parameters of curvature radius, the thickness of hemispherical liner and the height of shaped charge are analyzed, which provides a reference for the multi-layer EFP warhead. The results show that the effects of the various shaped charge structural parameters on the formation of independent EFP are different. Among them, the radius of curvature mainly affects the shape of each EFP; The bigger of the thickness of each layer liner, the faster of each layer liner separate; The influence of charge height on the EFP velocity and the length-diameter ratio of each layer is similar to that of the single layer liner, and the EFP velocity can be increased by increasing the charge height.