Abstract
The constitutive formulation of Perzyna for viscoplastic deformation, combined with the theory of thermally activated motion of dislocations is used to model plastic deformation of 1100-0 aluminum. The parameters of the model are derived from results of uniaxial stress experiments at a wide range of temperatures and strain rates. Different thermally activated mechanisms are assumed to dominate dislocation motion at low and high temperatures. Hardening is taken to be a function of either plastic strain or plastic work. When plastic work is used, strain rate history effects observed in incremental strain rate tests are predicted by the theory. To examine its validity, the constitutive model is also used in one dimensional analysis of elastic-plastic waves. In application to symmetrical bar impact experiments of Bell, the calculated wave profiles are in agreement with the measurements.
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