Modélisation du comportement plastique anisotrope des métaux CFC et CC texturés^*

Modeling the anisotropic plastic behaviour of textured FCC and BCC metals

¹ Directeur de Recherche au CNRS Ecole des Mines de Saint-Etienne, Département Matériaux
² Ecole des Mines de Saint-Etienne, Département Matériaux

Abstract

Plastic anisotropy of fcc and bcc metals can be quite simply and yet accurately described by using a continuum criterion (e.g. the Hill quadratic one) if crystallographic texture is explicitly taken into account: for that purpose, the <100> directions of the ideal orientation are selected as anisotropy axes and the anisotropy constants are calculated by an optimization procedure. It is shown by this way that parameters such as the Lankford coefficient are generally Utile sensitive to the crystallographic structure as well as to the ratio £ of the critical resolved sliear stresses associated with the 110 and 112 slip planes in the bcc structure.