破片侵彻纤维复合材料板的有限元数值模拟

采用有限元方法对几种不同外形和材料的破片模拟弹垂直侵彻玻璃纤维增强复合材料层合板的动态响应过程进行了模拟分析,研究了靶板有限元模型网格尺度对抗破片侵彻特性模拟计算结果的影响,分析了靶板直径和边界约束条件等因素对复合材料板的抗破片特性的影响。对于厚度为4.0mm以上的较厚靶板,几种常用的13.4g钢质破片模拟弹的外形和材料的差异对侵彻能力影响较小。与已有文献中的实验结果的比较表明:当有限元网格尺度接近复合材料单层厚度时,计算结果的精度较好;当靶板直径大于一个与靶板材料波速相关的临界直径时,靶板直径、边界约束条件对破片模拟弹剩余速度的影响可忽略;完全固支条件的计算结果比简支或自由边界条件更接近于大尺寸靶板的计算结果。

Finite element simulation of FRP plates impacted by fragments

The dynamic response of fiber reinforced composites impacted by fragment simulating projectiles(FSPs) of different shapes and materials was simulated with the finite element method.Studies were performed on the influence of the target’s finite element mesh size to the particle penetration.The effects of the target plate diameter and boundary conditions on the ballistic analysis results were also investigated.The differences in the perforation probability of 13.4 g steel FSPs with different shapes and materials is negligible for composite targets thicker than about 4 mm.The numerically predicted ballistic limit velocities agree well with experimental results only with mesh sizes close to the ply layer thickness.If the target plate diameter is larger than a critical value related to the plate material wave speed,the target plate diameter and boundary conditions have almost no effect on the predicted fragment residual velocity.Simulations with fully clamped boundary condition are closer to those of a large target plate than with simply supported boundaries or fully free conditions.