Some remarks on the damage unilateral effect modelling for microcracked materials

Hélène Welemane (1) , Fabrice Cormery (1)

1 LML - Laboratoire de Mécanique de Lille - FRE 3723

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 to extend its micromechanical background 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; microcracks opening- closure; damage activation-deactivation; elastic moduli recovery; anisotropy; stress-strain response continuity.

Domaines: Mécanique des matériaux [physics.class-ph]

Hélène Welemane, Fabrice Cormery. Some remarks on the damage unilateral effect modelling for microcracked materials. International Journal of Damage Mechanics, 2002, vol. 11 (n° 1), pp. 65-86. ⟨10.1106/105678902022260⟩. ⟨hal-00140767⟩