Abstract
Abstract Motivated by the effect of the different loading paths (uniaxial and multiaxial) and the mean stress or strain effects, fatigue life is qualitatively evaluated by employing a micromechanical approach developed in the first part of this paper. Taking into account these loading conditions, a number of numerical tests are carried out to demonstrate the ability of this model to describe the inelastic-damaged behavior of low cyclic fatigue. Theoretically, the internal variables evolution on the Crystallographic Slip Systems (CSS) are recorded under these loadings up to the final fracture of the Representative Volume Element (RVE). The predicted macro-damage DT as well as the applied macro-stress Σ are recorded and analyzed during fatigue life. It is demonstrated that, at least qualitatively, the developed model gives successful results describing the fatigue lives under employed loading paths. Quantitatively, after the identification of the material constants of the over-aged Waspaloy, two examples are taken into consideration representing the uniaxial and biaxial cyclic behavior of this alloy. It is shown that the predicted responses are in good agreement with the experimental results.
Published Version
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