Abstract: A viscoplastic constitutive model developed by Perzyna to describe stress wave propagation in rate-dependent materials is examined. The model is considered in terms of dislocation concepts and ...

Abstract: Two distinct types of experiments are employed to examine an elastic/viscoplastic constitutive theory in a radial cylindrical configuration. One examines the plane-strain plastic response of hollow ...

Abstract: The introduction of inertia terms into a theoretical model of thin ring expansion shows that classical plastic instability concepts, defined in terms of the local strain in the necking region, ...