TiC 颗粒增强钛基复合材料的动态损伤本构

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。

Dynamic Damage Constitutive of TiC Particle Reinforced Titanium Matrix Composites

The micro-damage evolution of TiC particle reinforced titanium matrix composites was analyzed, and
a dynamic constitutive model with damage evolution was established. When TiC particle reinforced titanium matrix
composites withstands tensile loads, micro-cracks expand in form of wing cracks through the matrix. Based on the
wing crack growth model, a biaxial damage evolution constitutive was set up. And by degenerating, the uniaxial tension
damage evolution constitutive was gotten. It is assumed that microcrack nucleation law accords with Weibull distribution,
then a macroscopic and microscopic combined dynamic constitutive model in a one-dimensional stress state
was established, which can reflect the damage evolution of TiC particle reinforced titanium matrix composites. Model
simulation results agree well with the experimental curves.