Abstract
Measurements of the transient response following sudden strain-rate changes were made on polycrystalline copper specimens which had been work hardened by cycling to a steady state. The behaviour was modelled computationally by an overstress plasticity theory which used a single kinetic equation. This equation needed an equilibrium stress-strain curve and two further material parameters related to the free energy required by dislocations to overcome obstacles in the lattice and to the size of the obstacles for its implementation. The model represented the behaviour reasonably well with the initial rapid component of the transient being explained in terms of the elastic properties of the material and the slower approach to the stress-strain curve characteristic of the new rate by the softening effect of the kinetic equation. This is in contrast with many other plasticity theories which have been used to explain monotonic rather than cyclic loading behaviour and in which the two components of the transient have been explained in terms of separate plasticity equations describing athermal hardening and thermal softening respectively.
Published Version
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