Cadre thermodynamique non standard pour calculs robustes avec endommagement anisotrope

A non standard thermodynamics framework ensures the positi vity of the dissipation due to degradation mechanisms for damage states represented by a symmetric second or der tensor. The proof of the positivity of the intrinsic dissipation is given. An increasing damage, in terms of posi tive principal values of the damage rate tensor, guaranties this positivity for the considered class of models, e then to induced anisotropy the isotropic case property of a positive damage rate. This result gives many po ssibilities of modeling for anisotropic damage. Mots-clefs :