Armor-piercing projectile is one of the main threats faced by light armored vehicles. The after-effect fragments formed by projectile penetrating armor will cause injuries to the occupants. It is an important reference for evaluating the impact of the armor-piercing projectile on light armored targets. The characteristics of after-effect fragments have a great influence on the lethal efficiency of internal occupants, especially those wearing bulletproof vests. In order to study the injury effect of the after-effect fragments on occupants, the 12.7 mm multifunctional bullet was tested to 10 mm armored steel to obtain the mass distribution of after-effect fragments at different speeds, and then a finite element model of the effect of after-effect fragments on the human thorax FEM with soft body armor was established. Through numerical simulation, the impact of different after-effect fragments of bullets was obtained. The stress changes, pressure changes and etc. of human model after the impact of different after-effect fragments were obtained that provides a basis for further evaluation of the injury effect of fragments on occupants in light armored vehicles.
Large-caliber multi-function rifle projectile is one of the main weapons used by the army to attack light armored vehicles. The damage of the bullet to light armored targets is not only the direct killing effect of bullets hitting the target, but also the flames and fragments formed by the penetration process. In this paper, the impact effect of a large caliber multi-functional bullet on light armored vehicles with different firing distance is studied by experiments. By reducing the charge to simulate the shooting at different distances, rifle projectiles with different speed penetrate 10 mm armor plate, and the formation process of after-effect fragment and flame is captured by high-speed photography. The flying angle, flame length and flame time can be observed from the high-speed photographic image. Through data processing, the spatial range of the after-effect fragment and flame was obtained. The research results showed that there was a positive correlation between fragment speed and penetration velocity, the after-effect fragment dispersion and the flame length are not very sensitive to the distance, and the flame size at the distance of 100 m is up to about 50% than 400 m, the flame action time at 400 m is 4.62 times that of 100 m, and the flame reached the brightest time at 400 m is 10.29 times that of 100 m.
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