Research on the Dynamic Response of Penetration and Perforation of Armor-Piercing Rounds against Gelatin Targets with Protective Coatings

Abstract

Abstract In order to investigate the coupled damage mechanism of blunt impact and penetration of projectiles after penetrating bulletproof plates against human body targets, experiments were conducted using 6.8mm caliber armor-piercing bullet against gelatin targets with protective coatings. A numerical analysis model of projectile penetration into gelatin with protective coatings was established, obtaining endpoint characteristic quantities such as projectile velocity changes, changes in energy distribution, pressure, stress, and stress wave variations within the gelatin target after protection. The results indicate that at a velocity of 640 m/s, the 6.8mm caliber armor-piercing round failed to penetrate the bulletproof plate, yet still caused a blunt impact depression of 37mm in depth. Under conditions where the projectile did not penetrate the bulletproof plate, approximately 80% of the projectile's kinetic energy was absorbed by the bulletproof plate. At a velocity of 740 m/s, the projectile penetrated the bulletproof plate, resulting in a blunt impact depression depth of 56mm and an instantaneous cavity with a maximum diameter of 60mm. During the process of penetrating the bulletproof plate, approximately 50% of the projectile's kinetic energy was absorbed by the bulletproof plate, and about 40% of the remaining kinetic energy was transferred into the gelatin during the penetration of the target.