Ductile Damage Accumulation Under Cyclic Loading Evaluated By The Extended Subloading Surface

摘要

Designing reliable structural components that undergo plastic deformations requires incorporating the damage mechanism into models. Ductile crack initiation results from the accumulation of plastic deformations induced by different loading conditions. However, an idealized neat distinction between the plastic and the elastic domains cannot explain structural failure caused by cyclic loading below the yield stress. In this paper, we combine damage mechanics and unconventional elastoplasticity theories by coupling the ductile damage and the subloading surface model constitutive equations. This plasticity model is particularly suitable for fatigue or cyclic loading problems because it can capture the accumulation of irreversible contributions, meaning that it provides a more precise model of damage evolution and prediction of failure.