Using first integrals of simple power law evolution equations describing isothermal constant rate (ICR) uniaxial deformation, it can be shown that ICR tests are sufficient to determine the parameters which appear in internal variable constitutive models of a large class. The procedure also identifies the sensitivity of the evaluation to the data sampling techniques in parameter space, and provides an opportunity for estimating from the data itself what values to assign for standard errors. Because the constitutive models considered have simple additive components of hardening representing isotropic and kinematic parts, decomposition of the data by removal of each component seriatim allows direct identification of random and systematic deviations.
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