平面编织复合材料层合板低速冲击后的拉伸性能

对两种不同铺层形式的平面编织复合材料层合板低速冲击后拉伸性能进行了实验研究，在此基础上建立了有限元损伤扩展仿真模拟。在所建立的有限元模型中，将低速冲击损伤等效为形状规则的软化夹杂，并针对两种铺层形式采用不同的损伤判据和模量衰减准则。研究结果表明:该有限元模拟结果与实验结果符合，说明该模型能够准确地预测低速冲击后平面编织复合材料层合板的损伤扩展规律和剩余拉伸强度；不同铺层形式的平面编织复合材料层合板在低速冲击后拉伸的损伤扩展规律不同；它们的冲击后拉伸强度降均>50%，在复合材料结构设计中应该受到重视。 

Tensile properties of plane woven composite laminates after low velocity impact

The tensile properties of two kinds of plane woven composite laminates after low velocity impact were studied by experiment. And an FEM model was established to simulate the damage growth in the laminates. In this model，the low velocity impact damage area was equivalent to a soft zone with a regular shape，both different damage criterions and modulus attenuation rules were used for two different ply forms. The results of the FEM model show good agreement with the experimental data. It means that this model can be used to predict the damage growth behavior and residual tensile strength of plane woven laminates with impact damage. The impacted plane woven composite laminates with different ply forms possess different damage propagation ways. The tensile strength after low velocity impact of plane woven laminates decreases over 50%. These results should be considered in designing the composite structure.