Author(s)

L. Stainier

Abstract

Rate dependent void growth in ductile metals submitted to large deformation L. Stainier LTAS - MC & T, University of Liege, B-4000, Belgium ABSTRACT In this paper, we present a rate-dependent damage model based on a generalization of the Perzina viscoplastic law applied to the Gurson-Tvergaard damage model. In a numerical example, this model is shown to be useful as a regularization method for problems with bifurcation difficulties due to softening. Other applications are also briefly overviewed. 1.INTRODUCTION Ductile rupture in metals is well known to be due to void nucleation, growth and coalescence. This damage process has been modelized by Gurson^ and by Tvergaard^'^, whose constitutive laws have been widely used in many numerical models of the degradation of ductile metals. In paragraph 2, we present this model. The aim of this paper is to present a generalization of Perzina^ rate- dependent law applied to the Gurson-Tvergaard constitutive model, which is

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