Computational issues in rate dependent plasticity models

In the present paper computational issues and numerical integration algorithms are illustrated with reference to the evolutive process in rate-dependent plasticity problems. The adopted methodology conveniently relates the rate-dependent consistency parameter of the plasticity model with the flow function of the constitutive model in use. A fully implicit integration scheme is applied which correctly reduces to the inviscid limit for null viscosity parameter. Numerical examples and computational results are reported which illustrate the effectiveness of the procedure.