Analysis of the influence of structural parameters of irregular charges on the forming performance of EFP with tail Fins

Abstract In this study, a special charge structure is designed to form an explosively formed projectile (EFP) with fins for stable flight. By using LS-DYNA for numerical simulation, the influence of charge structure parameters on the EFP characteristics of the tail fins was analyzed. The results show that the irregular charge structure can reliably form an EFP with fins, and the number of EFP tail fins can be controlled by changing the number of sides n of the regular polygon at the top section of the charge. Changing the shape parameters n and Dn of the top section of the charge will greatly affect the shape of the tail fins, while the charge height H has a significant impact on the length to diameter ratio of EFP, the appropriate range of H values should be between 0.5Dc and 0.8Dc. The research results can provide reference for the design ideas of tail wing EFP.