Abstract
A descriptive model for rate- or time-dependent behavior in cyclic plasticity, based on the random barriers theory, was presented by considering the velocity of a moving which was a member of movable dislocations and named as a dislocation in this paper. Each of the stress- and strain-rate sensitivities on the stress-strain relation in each half cycle could be fairly estimated on the basis of an equilibrium equation derived in this study as a function of the stress-rate and the strain-rate at any stress level. Moreover, several types of transient behavior caused by a sudden change in the stress- or strain-rate might be uniformly expressed by each analysis of the processes in which a deficient or excess quantity of the free dislocations in this period came near to the moderate quantity decided by the stress and stress-rate.
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