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Some remarks on the damage unilateral effect modelling for the microcraked materials

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2002
auteur(s) Welemane Hélène; Cormery Fabrice
journal (abréviation) International Journal of Damage Mechanics (International Journal of Damage Mechanics)
volume (numéro) 11 (1)
pages 65 – 86
résumé This study deals with the macroscopic modelling of the mechanical behaviour of microcracked materials and particularly with the unilateral aspect of such damage which leads, at the closure of microcracks, to a partial damage deactivation. By means of a micromechanical analysis, the aim of this article is first to point out the influence of the opening–closure of microdefects on the effective elastic properties of a microcracked medium. According to these considerations,a new elastic moduli recovery condition at damage deactivation is proposed. The introduction of this condition within the anisotropic damage model proposed by Halm and Dragon, 1996 allows its micromechanical background to be extended while preserving its main advantages, in particular the continuity of the stress–strain response and the symmetry of the stiffness tensor.
mots clés damage • brittle materials • microcracks • unilateral effect • micro-cracks opening–closure • damage activation–deactivation • elastic moduli recovery • anisotropy • stress–strain response continuity
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