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根据金属疲劳断口具有几何分形特征,将Chaboche高周疲劳损伤模型推广到分数维空间,建立了综合考虑断口细观特征的髙周疲劳分形损伤演化模型.针对TC11钛合金电子束焊接接头,以载荷控制的疲劳试验为基础研究其高周疲劳性能;采用扫描电镜法(SEM)对断口微观特征进行定量分析,计算得到了各级载荷下疲劳断口的分形维数;通过对试验数据拟合,得到了疲劳损伤演化模型中的相关材料参数,从而建立了TC11焊接接头各级载荷下的分形损伤演化方程.
According to the geometrical fractal feature of the metal fatigue fracture, the Chaboche high-cycle fatigue damage model is generalized to the fractional space, and a fractal damage evolution model is established based on the microscopic fracture characteristics of the fracture. For TC11 titanium alloy electron beam welded joints, Controlled fatigue test. The microscopic features of the fracture were analyzed quantitatively by scanning electron microscopy (SEM), and the fractal dimension of fatigue fracture under various loads was calculated. By fitting the experimental data, The relevant material parameters in the fatigue damage evolution model were established, and the fractal damage evolution equation of the TC11 welded joints under various loads was established.