Abstract
A phenomenological set of constitutive equations has been developed in recent years for high temperature structural analysis. The equations provide a unified description of deformation in both the so-called “short-time plastic” and “long-time creep” regimes for monotonic and cyclic behavior. In particular, a single strain-rate equation is utilized in both regimes, and a single set of internal variables (which reflect such metallurgical features as dislocation pileups, subgrains, and Cottrell atmospheres) governs the non-elastic strain rate under all conditions. These internal variables thus provide the means for calculating interactions such as the effect of creep on subsequent cyclic response or the effect of cold work, recovery, and/or cyclic straining on subsequent creep response. Specific examples of such simulations are given.
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