Formulação Tangente para Análise Viscoplástica por Elementos Finitos Aplicada a Placas a Flexão

Abstract

The aim of this work is to present a tangent formulation for the
viscoplastic analysis of bending plates by the finite element method.
The starting point is to obtain a equation relating the increments of stress, total strain and rate of strain. This is achieved by making null the first order increment of the yield surface. The strain rate is considered as a parameter which controls the expansion and shrinkage of this surface.
The intesration in time of the resulting equation is performed by
means of an algorithm constant velocity.