止裂层对陶瓷复合防弹插板冲击损伤行为研究

目的 研究冲击载荷下迎弹面覆盖止裂层的复合防弹插板陶瓷面板碎裂机理和抗侵彻性能。方法 对所设计的复合防弹插板进行空气炮打靶试验，构建冲击仿真有限元计算模型。结合试验和数值模拟，研究覆盖环氧树脂、凯夫拉平纹织物止裂层及无止裂层复合防弹插板的抗侵彻性能，分析不同冲击速度下复合防弹插板陶瓷损伤失效过程。采用内聚力单元对止裂层和陶瓷之间的黏结区域进行建模，分析黏结程度对陶瓷损伤和失效的影响。结果 止裂层表面约束的陶瓷在冲击过程中产生的径向裂纹随着撞击点附近的环向拉应力波的传播而延伸。止裂层黏结作用增强时，陶瓷的冲击缺口面积增大，但质量损失基本不变；迎弹面止裂层未对侵彻过程中子弹动能和复合防弹插板背凸情况产生显著影响。结论 止裂层在一定程度上能减少陶瓷质量损失，但也会造成更多的损伤，这种现象在高速情况下较为明显，且凯夫拉平纹织物止裂层所造成的损伤更多。相关研究工作可为陶瓷复合防弹板的设计提供参考。

Thin Membrane Covering on Impact Damage Development in Ceramic Composite Bulletproof Plate

The work aims to study the cracking mechanisms and penetration resistance of the ceramic panel of the composite bulletproof plate covered with thin membrane under the impact load. A gas gun experiment was carried out on the designed composite bulletproof plate, and a finite element model of impact was established. Combining experiments and numerical simulations, the penetration resistance of the composite bulletproof plate covered with epoxy resin, Kevlar plain weave composite and bare composite bulletproof plates were studied, and the ceramic damage and failure process of the composite bulletproof plate under different impact velocities was analyzed. The cohesive element was used to model the bonding area between the thin membrane and the ceramic. The effect of the bonding properties on the damage and failure of the ceramic was analyzed. The radial cracks produced in ceramics restrained by the thin membrane during the impact process were induced by the circumferential tensile stress area near the impact point. As the restraint of thin membrane increased, the impact gap area of the ceramic increased but the mass loss remained unchanged; The thin membrane did not have a significant impact on the kinetic energy of the bullet and the back convexity of the composite bulletproof plate during penetration. The thin membrane reduces the loss of ceramic mass to a certain extent, but also causes more damage, which is more pronounced at higher speeds and more damage caused by the Kevlar composite. The related research work can provide a reference for the design of ceramic composite bulletproof plates.