Abstract

From a previously-presented phenomenological model for monotonic and cyclic deformation, a simplified set of constitutive equations is derived. Quantitative predictions for pure aluminum are compared with the corresponding experimental data for a variety of test situations, including (1) the effect of temperature and strain level on the strain-rate sensitivity, (2) the effect of applied stress on the amount of primary creep, and (3) response to complex loadings such as abrupt changes in stress. A major addition is made to the equations to incorporate solute strengthening effects; the resulting model can generate fairly realistic predictions of (1) the effect of temperature on the yield strength, (2) the effect of solute additions on strain-rate sensitivity, (3) the effect of work hardening on flow stress and strain-rate sensitivity, (4) the effect of solute additions on steady-state creep behavior and (5) peaks in apparent activation energy.

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