Influence of notch shape on creep damage under cyclic loading

Numerical calculations with K-R damage law have been performed to investigate the creep damage development in different notched specimens (C-notch, U-notch and V-notch) under cyclic loading. Emphases were placed on the roles of notch geometry, cyclic frequency, stress ratio and multi-axial stress factor-α. The creep damage constitutive relationship was programmed by the finite element code-ABAQUS via its user subroutine 'CREEP' and 'UVARM'. Creep damage and fatigue life are remarkably affected by mean stress, frequency, stress ratio and multi-axial stress factor-α. Larger mean stress and multi-axial stress factor α cause creep damage to develop faster, and higher stress ratio and frequency also result in the earlier creep failure.