Multimode Model for Fatigue Damage Development

A multimode kinetic model for the development of damage under cyclic loading is proposed to describe the development of fatigue failure process. To determine the coefficients of the kinetic damage equation, the well-known Smith–Watson–Topper (SWT) criterion of multiaxial fatigue fracture is used. On this basis, a procedure for calculating the kinetic equation coefficients for various modes of fatigue failure from low-cycle to very-high-cycle fatigue is proposed. A uniform numerical method is developed and examples of calculating the development of crack-like zones of damage and fatigue fracture of samples containing various defects for different cyclic loading modes are presented.