论文部分内容阅读
建立了一种在准静态压痕力作用下复合材料层合板凹坑深度的预测方法。首先采用基于应变描述的Hashin和Yeh失效准则并结合有限元法,对复合材料层合板在准静态压痕力作用下的失效过程进行渐进损伤分析,获取一系列的材料性能退化信息。其次采用Sun的方法对局部损伤区材料的弹性参数进行等效处理。最后结合Turner的接触理论预测了凹坑深度-接触力曲线。计算结果表明,基体开裂与分层是导致层合板开始产生凹坑的主要原因,纤维断裂是导致凹坑深度急剧增加的主要原因。分层起始载荷、最大接触力及各自相应的凹坑深度的预测结果与试验值具有较好的一致性。
A method of predicting the pit depth of composite laminates under quasi-static indentation force was established. Firstly, using the Hashin and Yeh failure criterion based on the strain description and the finite element method, a progressive damage analysis of the failure process of composite laminates under the action of quasi-static indentation force is performed, and a series of degradation information of material properties is obtained. Secondly, the method of Sun is used to treat the elastic parameters of the material in the local damage zone. Finally, with the Turner contact theory predicts the pit depth - contact force curve. The results show that the cracking and delamination of the substrate is the main reason that the plywood starts to produce pits. The fiber fracture is the main cause of the sharp increase of the depth of the pits. The results of the stratified initial load, the maximum contact force and their corresponding pit depths are in good agreement with the experimental values.