【摘要】 应用裂纹位错理论,建立了一个循环应力下疲劳短裂纹连续分布位错模型,通过对疲劳短裂纹损伤区与晶界之间的交互作用分析,确定了一种新形式的疲劳极限线图.更多还原

【Abstract】 Fatigue strength design of components under loads of a mean stress was based on the contours of fatigue limit,these diagrams were determined by using regression to the experiment data.Using the theory of dislocation crack,this paper develops a model of continuous distribution of dislocations of short fatigue crack under loads of a mean stress upon a cyclic stress,the interaction between the damage zone of short fatigue crack and grain boundaries in cyclic periods is processed,and then a new contour of fatigue limit in the form of hyperbola is obtained.更多还原