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分析了TiC颗粒增强钛基复合材料的微损伤演化规律,建立了含损伤演化的动态本构模型。TiC颗粒增强钛基复合材料在拉伸载荷作用下,微裂纹以翼型裂纹形式扩展,基于平面翼型裂纹扩展模型,建立了二维动态损伤本构关系,并退化到一维拉伸状态,假设微裂纹成核规律满足Weibull分布,得到了一维拉伸应力状态下能够反映TiC颗粒增强钛基复合材料的损伤演化规律的宏细观相结合的动态本构关系。模型计算结果与试验结果吻合较好。
The micro-damage evolution of TiC particles reinforced titanium matrix composites was analyzed and a dynamic constitutive model of damage evolution was established. TiC particles reinforced titanium matrix composites under tensile load, microcracks in the form of airfoil crack expansion, based on the plane airfoil crack growth model, the establishment of a two-dimensional dynamic damage constitutive relationship, and degenerated to one-dimensional tensile state, It is assumed that the nucleation rules of microcracks satisfy the Weibull distribution, and a dynamic constitutive relationship combining the macro and micro aspects that can reflect the damage evolution of TiC particles reinforced titanium matrix composites under one-dimensional tensile stress is obtained. The calculated results are in good agreement with the experimental results.