Abstract
Deformations of solids depend on the rate of loading or deformation, exhibiting the time-dependence or rate-dependence in general. Constitutive equations describing the rate-dependent plastic deformation is described in this chapter. The physical background of rate-dependent plastic deformation and the history of the development of rate-dependent plastic constitutive equation are reviewed first. Then, the pertinent formulation of the rate-dependent plastic constitutive equation is delineated, which is capable of describing the smooth elastic-plastic transition and the rate-dependence for the general rate ranging from the quasi-static deformation to the impact loading behavior.
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