The fracture and fatigue performance of corroded steel components show significant degradation in both the crack initiation and propagation stage. This study is aimed to research the fracture behavior degradation mechanism of corroded steel members through investigating the effects of pits on stress intensity factor magnitude and distribution. The numerical simulation method was adopted, and a series of specimens with different sizes and shapes of corrosion pits were modeled. It was found that the pitting-degradation models would show a more intense displacement and stress field. A greater value of stress intensity factor SIF could be observed in model interior when the specimens were attacked by corrosion pits. The SIF distribution characteristic along thickness direction was affected by ratios of pit depth to radius. According to SIF numerical results, the premature fracture and shorter fatigue life induced by corrosion pits could be attributed to the higher SIF value compared with non-corrosion one.

腐蚀钢部件的断裂和疲劳性能在裂纹萌生和扩展阶段均表现出显着退化。本研究旨在通过研究凹坑对应力强度因子大小和分布的影响，研究锈蚀钢构件的断裂行为退化机制。采用数值模拟方法，对一系列不同大小和形状的腐蚀坑试件进行建模。发现点蚀-退化模型会显示出更强烈的位移和应力场。当试样受到腐蚀坑的攻击时，在模型内部可以观察到更大的应力强度因子 SIF 值。沿厚度方向的 SIF 分布特性受凹坑深度与半径之比的影响。