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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。
Based on the mesoscopic structure model of three-dimensional all-five-directional (Q5D) braided composites, a failure analysis model of uniaxial tensile damage of interfacial phase Q5D braided composites was established by introducing interfacial phase elements. The secondary development of ABAQUS was realized by using Python language. The failure criterion and Von-Mises stress criterion proposed by Linde et al. Were respectively used for judgment of progressive damage of yarn and matrix and the overall failure mode of material was determined. For interface phase, Quads Criteria for damage judgment. The progressive damage damage of Q5D braided composites with interfacial phase was numerically simulated by using periodic displacement boundary conditions. The effects of longitudinal tensile load on the initiation, propagation and The failure mechanism of the material is analyzed, the failure mechanism of the material is analyzed, the ultimate failure strength of the material is predicted, and the influence of interface phase properties on the overall mechanical behavior of the material is also studied. The results show that the numerical simulation results are in good agreement with the experimental values, and the validity of the progressive damage model is verified. This provides a basis for the mechanical analysis and optimization design of such materials.