广布疲劳损伤裂纹萌生问题研究
Study on Initiation of Wide-spread Fatigue Damage Cracking

围绕广布疲劳损伤裂纹萌生问题研究了广布疲劳损伤裂纹萌生寿命与广布疲劳损伤出现时间的关系，以及MSD对裂纹萌生寿命的影响。给出了根据疲劳开裂情况确定的裂纹萌生寿命和损伤累积的修正计算方法，解决了MSD结构中细节疲劳裂纹萌生寿命计算问题同时计及了MSD对裂纹萌生的促进加速效果。
This paper studies the issue of wide-spread fatigue damage (WFD) crack initiation which focuses on the relationship between crack initiation life and time of widespread fatigue damage occurrence, as well as the impact of multiple site damages (MSD) on crack initiation life. Finally, this paper proposes a correcting calculation method for crack initiation life and damage accumulation base on MSD cracking condition