A Modified Corrosion Fatigue Crack Growth Model Based on CTOD

To enhance the safety and reliability of marine structures in service, it is imperative to establish precise models for corrosion fatigue crack growth. In this study, we propose a novel corrosion fatigue crack growth model based on crack tip opening displacement (CTOD), which can account for small crack effects. The synergistic effects of environmental factors on corrosion such as temperature and p H can be quantified by the corrosion current Icor, while the influence of mechanical parameters on electrochemical reactions at the crack tip is incorporated through the loading frequency f. Based on the synergy of the above parameters, the model coefficients are modified. Finally, several crack growth datasets from two different corrosion environments are used to verify the proposed model. The model prediction shows good agreement with the experimental data, confirming its effectiveness and applicability.