MODELING THE FORMATION AND PENETRATION OF A HIGH-SPEED JETTING PROJECTILE CHARGE

Abstract

In this study, experiments and numerical analyses have been carried out to investigate the performance of a modified high-speed Jetting Projectile Charge (JPC) based on a Explosively Formed Projectile (EFP). A medium-carbon steel (AISI 1045) target was used in the penetration experiments of the modified JPC and the conventional EFP. The tip velocity of the metal jet before penetration was measured using speed sensors. The length to diameter ratio of The EFP is 1:1, the shell thickness is 5 mm, and the linear thickness is 1.8mm. The formation and penetration performance of the modified shaped charge structure were reproduced in a validated numerical simulation using AutoDYN-2D. The penetration depth, the diameter of the penetration crater, and the tip velocity of the JPC/EFP obtained from the simulation agreed well with the experimental results. The function of the propelled structure, the auxiliary structure, and the liner of the modified JPC and their interactions with each other were discussed and compared with the performance of the JPC in terms of the shape\velocity of the jet and its penetration ability by numerical simulation. Both the experiments and numerical simulations shows that the penetration depth of the modified JPC into the mild carbon steel (AISI 1045) increased by 55 % compared to that of the EFP.