The full-field digital image correlation (DIC) technique was used to identify crack initiation and early crack growth on irregular, corroded surfaces from offshore mooring chain. Finite element analysis was paired with the DIC measurements, which made it possible to correlate initiation events with local stress concentrations due to corrosion pits. An initiation S-N curve was established based on this correlation. It included 14 crack initiation events from 4 specimens, in addition to statistical treatment of regions where no initiation occurred. The first cracks initiated at 13–24% of the total lifetimes of the specimens.

中文翻译：

---

海上系泊链腐蚀表面疲劳裂纹萌生点连续测绘的数字图像相关性

全场数字图像相关 (DIC) 技术用于识别海上系泊链不规则腐蚀表面上的裂纹萌生和早期裂纹扩展。有限元分析与 DIC 测量相结合，这使得将引发事件与由于腐蚀坑引起的局部应力集中相关联成为可能。基于该相关性建立起爆SN曲线。除了对未发生裂纹的区域进行统计处理外，它还包括来自 4 个试样的 14 个裂纹萌生事件。第一次裂纹发生在试样总寿命的 13-24% 时。