For metals under cyclic loading at elevated temperatures the interaction of fatigue failure with intergranular creep failure is studied by a micromechanical model. Focus here is on a range of relatively slow cycling, where creep damage dominates, or rapid cycling after that some creep damage has developed. A numerical unit cell model analysis for a small region around a grain boundary cavity is used to study the acceleration of the damage process due to the development of fatigue damage in the ligament between neighbouring grain boundary cavities. The prediction of fatigue damage is incorporated in a cyclic plasticity model, and dislocation creep is represented as power-law creep. Also the effect of grain boundary diffusion on the cavity growth rate is accounted for in some cases.
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