A SELF-CONSISTANT POLYCRYSTALLINE MODEL FOR CREEP UNDER COMBINED STRESS STATES.
BROWN UNIV PROVIDENCE R I DIV OF ENGINEERING
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The application of the self consistent polycrystalline model of inelastic deformation has been extended to include time dependent i.e. creep behavior. Comparison of the predictions of a simple power law microconstitutive relation in the model with experiments, suggests that an appreciable amount of the observed dependence of behavior on prior history of combined stressing can be explained by grain interaction effects. The existence of a flow potential for the self consistent polycrystalline model is demonstrated, and flow potential surfaces, calculated from a simple power law microconstitutive relation, are shown for several cases of combined tension-torsion deformation. To a good approximation, these surfaces exhibit a kinematic translation in stress space with prior deformation history. Author