Corrosion fatigue damage can lead to degradation of engineering structures and components. As a major stage of the total corrosion fatigue life, the crack initiation of pitting corrosion and fatigue is studied. A continuum damage mechanics model for predicting the crack initiation life of pitting corrosion fatigue is presented based on a pure fatigue damage model and a fracture-mechanics-based pit-to-crack transition criterion. The synergistic effect of pitting corrosion and fatigue are quantified as a time-varying amplification of the fatigue stress field. The proposed model is validated by corrosion fatigue test data of two different metallic materials. The predicted curves of corrosion fatigue crack initiation life are in good agreement with the test data. The model demonstrates a good prediction of corrosion fatigue crack initiation life, i.e., corrosion fatigue life is always lower than fatigue life, and the lower the stress, the more significant the life reduction.

腐蚀疲劳损伤会导致工程结构和部件的退化。作为总腐蚀疲劳寿命的一个主要阶段，对点腐蚀和疲劳的裂纹萌生进行了研究。基于纯疲劳损伤模型和基于断裂力学的点蚀-裂纹转变准则，提出了一种预测点蚀疲劳裂纹萌生寿命的连续损伤力学模型。点蚀和疲劳的协同效应被量化为疲劳应力场的时变放大。所提出的模型通过两种不同金属材料的腐蚀疲劳试验数据进行了验证。预测的腐蚀疲劳裂纹萌生寿命曲线与试验数据吻合较好。该模型展示了对腐蚀疲劳裂纹萌生寿命的良好预测，即