MODELING OF DEFORMATION TEXTURE DEVELOPMENT BASED ON RATE INDEPENDENTCRYSTAL PLASTICITY

Crystal plasticity based on the concept of yield surfaces with rounded corners (Gambin, 1991a,b, 1992a,b; Arminjon, 1991) is applied to the prediction of texture development in plastically deformed f.c.c. metal s. With this crystal description, the problem of non-uniqueness in the choice of active slip systems is overcome within the rate-independent approach. The model may be considered as an approximation of that bas ed on the Schmid law. In addition, it describes a wide class of crysta ls that deviate from the Schmid law. In the present paper, the relatio n between the stacking fault energy (SFE) of crystalline materials and the parameter describing the roundness of yield surface vertices is s uggested. This model allows predictions of reorientation paths and tex ture development for f.c.c. metals of low, medium and high SFE. As an example, a simulation of 'brasstype' (for silver) and 'copper-type' (f or copper and aluminium) rolling textures is presented. (C) 1997 Publi shed by Elsevier Science Ltd.