Creep Recovery and Hardening Effects on the Stress Field Near a Crack Tip Under Variable Loads
It is thought that creep recovery may be one of the main causes of acceleration of crack growth rates under creep fatigue interaction conditions. In this paper, effects of creep recovery and hardening on the near tip fields under variable loads are examined. Robinson’s constitutive relation, which is based on the Bailey-Orowan model, is used to take these effects into account. It is found that the Hutchinson-Rice-Rosengren type singular fields prevail near the crack tip for any combination of material parameters. The variation in intensities of the singular fields is discussed.
KeywordsCrack Growth Rate Variable Load Harden Effect Creep Recovery Creep Fatigue Interaction
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