Continuum damage mechanics based fatigue life prediction and fatigue property analysis of pitting corrosion steel bars

An elastoplastic continuum damage model is applied to simulate the fatigue damage process of pitting corrosion of hot-rolled steel bars. The elastic and plastic model parameters for HRB400 steel bar are calibrated by systemic static and cyclic loading tests. Based on this model, a numerical simulation program is implemented in ABAQUS. The fatigue life prediction results of pitting corrosion hot-rolled steel bars via this CDM-based approach are compared with those of fatigue tests and FM method, indicating better accuracy and adaptability with an error basically within 20 %. Finally, the nonlinear evolution of fatigue damage and stress-strain field are analyzed, and the effects of corrosion pit morphology and tensile stress are investigated. It is shown that the developed model and calibrated parameters can be used to study and describe the corrosion fatigue damage evolution of pitting corrosion hot-rolled steel bars.