基于扩展有限单元法的短纤维/橡胶复合材料裂纹扩展分析

为了研究短纤维/橡胶复合材料裂纹在拉伸载荷作用下的扩展演化规律,应用扩展有限元法对预制裂纹的短纤维/橡胶复合材料的裂纹扩展进行了数值模拟.采用随机顺序吸附算法在ABAQUS软件中生成短纤维分布模型,分析了失效准则参数(最大许用主应力和裂纹表面能)、短纤维细观参数(体积含量、长度和取向角)对裂纹扩展行为的影响规律,探究了...

Crack Propagation Analysis of Short Fiber Reinforced Rubber Composites Based on Extended Finite Element Method

In order to study the crack propagation evolution law of short fiber reinforced rubber composites under tensile loading. The crack propagation of short fiber reinforced rubber composite with prefabricated cracks was simulated by using the extended finite element method. The random sequence adsorption algorithm was used to generate model in ABAQUS. The effects of failure criteria parameters (maximum allowable principal stress and crack surface energy) and short fiber meso-parameters (volume content, length and orientation angle) on crack propagation behavior were analyzed. And investigated the toughening mechanism of short fibers. The numerical results were in good agreement with the experimental results. The results show that reducing the damage threshold of substrate material, can realize the propagation of the crack without changing the crack propagation characteristics. The existence of short fiber reinforced phase will change the extension direction of crack, crack extension path brings complexity to improve material tear resistance. The tortuosity of crack propagation path increases with the increase of short fiber content, length and orientation angle, and the work consumed in the specimen breaking is increased, and the tear resistance is improved.