【摘要】 以缺口件为研究对象，根据疲劳非扩展裂纹的性质，给出裂纹萌生尺寸的定义，提出疲劳裂纹萌生尺寸的确定方法，从损伤角度解释其萌生尺寸的物理意义，最后用局部应力应变法估算形成寿命，验证其合理性。更多还原

【Abstract】 The notch specimens were used as researching objects.The definition of fatigue crack initiation sizeand the determining method was put forward. The physical significance of fatigue crack initiation size was explained from fatigue damage meaning. The initiation life of fatigue crack was predicted by means of the local stressstrain method and verified the method to be correct.更多还原