多层复合结构对高速破片的防护特性

At present, the research on the protective structure mainly focuses on the hypervelocity (>3 km/s) impact of small mass (less than 1 g) fragments and the relatively low-speed (<1 km/s) impact of large mass (more than 10 g). There are few studies on the impact and protection effects of 5-10 g mass of fragments. In this paper, the protective characteristics of multilayer composite structures for high-velocity cm-sized fragments are researched. 6 g 7075 aluminum alloy cylindrical projectile was launched into three-layer composite protective structure target by using a two-stage light gas gun. The protective characteristics of protective structure are studied, and three protective structure schemes are compared to obtain an effective protective structure. Numerical simulations are performed using Autodyn-3D. The validity of the numerical simulation model parameters is verified by comparing the simulated results with the experimental results. The energy transfer process of the projectile impacting the composite plate was obtained through simulation calculation, and a reasonable solution was proposed for the ply stacking sequence of multilayer composite structure.