J. Phys. IV France
Volume 105, March 2003
Page(s) 55 - 62

J. Phys. IV France
105 (2003) 55
DOI: 10.1051/jp4:20030171

A non-classical micro-macro transition towards the anisotropic damage behaviour of particulate composites

C. Nadot-Martin, N. Lesur, D. Halm, H. Trumel and A. Dragon

Laboratoire de Mécanique et de Physique des Matériaux, UMR 6617 du CNRS, École Nationale Supérieure de Mécanique et d'Aérotechnique, 1 avenue Clément Ader, BP. 40109, 86961 Futuroscope-Chasseneuil cedex, France

The complex problem of micromechanically based constitutive description of composite materials for which damage consists in grain-matrix debonding is treated employing the homogenization method initially proposed by Christoffersen [1] for elastic bonded granulates. The localization relations (microscopic level) as well as the homogenized stress are established and discussed for a fixed state of damage (i.e. for fixed numbers of open and closed cracks) and using the hypothesis of no sliding on closed crack lips. Finally, a complementary, thermodynamically motivated approach is performed in order to express the crack opening effect as a function of macroscopic strain and of two damage variables involving granular aspects and emerging from the scale transition.

© EDP Sciences 2003