低速冲击下复合材料层合板损伤分析

Damage Analysis of Laminated Composites Under Low Velocity Impact Loading

根据低速冲击下复合材料层合板的分层损伤机理,发展了一种分层失效准则,该准则同时考虑了层间拉应力、层间剪应力和基体开裂等因素对分层损伤的影响,并在损伤分析中,区分了冲击正面由挤压应力引起的纤维挤压损伤和冲击背面由弯曲拉应力引起的纤维断裂损伤,模拟了纤维断裂、纤维挤压、基体开裂、基体挤压、分层等五种损伤的起始和扩展过程,完善了作者以前发展了低速冲击逐渐累积损伤模型。通过与实验结果进行比较,验证了模型的合理性。

A new delamination criterion was proposed according to delamination damage mechanism under low velocity impact loading. The influence of through-thickness tensile stresses, interlaminar shear stresses and matrix cracking on delamination had been taken into consideration. The fiber crushing caused by the crushing stresses of impact surface and fiber cracking aroused by tensile stresses of impact back surface has been distinguished. The initiation and propagation of fiber tensile failure, fiber compressive failure, matrix crushing, matrix cracking and delamination were simulated in the improved model. A good agreement was found between the predicted results and the test data.