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    Evaluation of the Effect of Creep and Mean Stress on Fatigue Life Using a Damage Mechanics Approach

    Published: 01 January 1992

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    A method for fatigue life prediction of high temperature polycrystalline materials under high rate fully reversed strain cycles (HRSC) was previously derived using a continuum damage mechanics approach. The method is generalized in this paper to predict the fatigue life of balanced cyclic creep rupture (BCCR), tensile cyclic creep rupture (TCCR), and compressive cyclic creep rupture (CCCR). It is assumed that creep deformation mechanisms dominate during the creep portion of the fatigue cycle and that plasticity mechanisms dominate during the plastic portion of the cycle. The interaction of plasticity and creep with the mean applied stress and the effect of this interaction on the fatigue life are investigated. A sample calculation is applied to René 80 at 1255 K (1800°F).


    fatigue (metals), creep-fatigue, mean stress, life prediction, damage mechanics, high temperature, René 80

    Author Information:

    Abuelfoutouh, NM
    Cairo University,

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP24153S