Abstract：Fatigue failure is the most common form of failure in engineering. Under the interaction between corrosive environments and fatigue load, the fatigue performance of structures will be significantly reduced. It often consumes a lot of time and economic costs to evaluate the fatigue properties of materials or structures by corrosion fatigue experiments. Therefore, establishing a reliable numerical prediction model for scientific research and engineering design is significant. In this paper, we develop a peridynamic corrosion fatigue model, which combines the peridynamic fatigue crack model and the peridynamic stress-corrosion model, according to the superposition model of corrosion fatigue. In this model, corrosion fatigue damage is a linear superposition of corrosion damage and fatigue damage, and the coupling between stress and corrosion is considered. We simulate the corrosion fatigue failure process (including crack initiation and crack growth phase) of stainless steel compact tensile specimens. The numerical results show that the peridynamic corrosion fatigue model can describe the damage evolution process of corrosion fatigue, and the introduced mechano-chemical damage model captures the fatigue life reduction and loading frequency sensitivity of specimens.
2024, Vol. 45 
