论文部分内容阅读
针对复合材料π接头复杂的失效形式,采用材料刚度退化的方法模拟结构的渐进失效过程.用Abaqus建立某复合材料π接头的三维有限元模型;采用三维Hashin失效准则和Ye分层准则判别复合材料层合板的5种失效形式,将理想弹塑性材料模型应用于胶层材料来模拟胶层材料的失效,在Abaqus中建立考虑复合材料层合板和胶层失效的分析子程序;在子程序中,定义6个场变量代表纤维拉伸破坏、纤维屈曲、基体拉伸开裂、基体压缩开裂、分层失效和胶层失效等6种失效形式.在递增的拉伸载荷作用下对所建模型进行失效分析,结果表明该方法能有效地对复合材料π接头进行初始失效位置及载荷的判别和最终失效预测.
Aiming at the complex failure modes of the composite π joints, the progressive failure process of the structure was simulated by the method of material stiffness degradation.The three-dimensional finite element model of a composite π joint was established by using Abaqus. The 3D Hashin failure criterion and the Ye hierarchical criterion were used to determine the composite material The five failure modes of the laminates are that the ideal elastoplastic model is applied to the layer material to simulate the failure of the layer material. In Abaqus, the analysis subroutine considering the failure of the composite laminates and layers is established. In the subroutine, Six field variables are defined to represent six kinds of failure modes, such as fiber tensile failure, fiber buckling, matrix tensile cracking, matrix compression cracking, delamination and failure of the rubber layer, etc. The model is invalidated under increasing tensile load The results show that this method can effectively predict the initial failure position and load of composite material π joints and predict the final failure.