含界面相三维全五向编织复合材料拉伸行为模拟及失效机制研究

基于三维全五向（Q5D）编织复合材料的细观结构模型，通过引入界面相单元，建立了含界面相Q5D编织复合材料单轴拉伸损伤失效分析模型。应用Python语言实现对ABAQUS的二次开发，将Linde等提出的失效准则和Von-Mises应力准则分别用于纱线和基体的渐进损伤判断，并确定材料的整体失效模式；对于界面相，采用Quads准则进行损伤判断。利用周期性位移边界条件，对含界面相Q5D编织复合材料的纵向拉伸应力-应变行为进行了渐进损伤数值模拟，详细讨论了在纵向拉伸载荷作用下材料的细观损伤起始、扩展和最终失效的演化过程，分析了材料的细观损伤失效机制，预测了材料的极限破坏强度，并研究了界面相性能对材料整体力学行为的影响规律。研究结果表明，数值模拟结果与实验值吻合较好，验证了渐进损伤模型的有效性，为该类材料的力学分析和优化设计奠定了基础。

Failure mechanisms analysis and simulation to tensile mechanical behaviors of 3D full five-directional braided composites with interface phase

Based on the meso-structure of 3D full five-directional (Q5D) braided composites, a nonlinear finite element model with interface phase was presented to simulate the damage and failure of Q5D braided composites under unidirectional tension by introducing the interfacial phase element. The failure criteria proposed by Linde and Von-Mises criteria were considered for initial damage prediction of yarns and matrix. Quads failure criteria was adopted to identify the onset of debonding of the interface phase. The progressive damage of Q5D braided composites with interface phase was studied subjected to longitudinal tensile loading, and ultimate strength of the sample was obtained. The damage mechanisms were revealed in the simulation process and the changing characteristics of mechanical behaviors of braided composites with the interfacial properties were described. The results show that the numerical simulation results are in a good agreement with experimental results, which validate the effectiveness of the model and provide a basis for the analysis of mechanical properties and optimization design of structures.