Constitutive relations for metal nonelastic deformation are proposed. The descriptiion is entirely in terms of real time strain rate. The equations are fully three-dimensional, and the description is incremental. Changes of loading direction are treated in a simple manner. The current deformation state of the metal is characterized by a set of state variables that themselves evolve by well defined laws. The experimental background for the theory is also described.
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E. W. Hart (1976) studied this question.