Analyses numérique et holographique de l’endommagement d’un matériau composite induit par l’incompatibilité de ses phases

Numerical and holographic analyses of a composite material damaging induced by phases incompatibility

¹ Laboratoire des Matériaux de Construction Ecole Polytechnique Fédérale de Lausanne, Suisse
² Laboratoire de Mesure et d’Analyse des Contraintes Ecole Polytechnique Fédérale de Lausanne, Suisse

Abstract

A composite is characterized by a continuous phase identified by the matrix and one or more other phases dispersed within it. Within the composite the phases retain their respective identities. Under certain conditions the significant differences between the physical and mechanical properties of the different phases that are present may generate internal stresses that can provoke microcracks within the structure. This article discusses the incompatibility associated with a porous matrix containing inert aggregates, as encountered in normal concretes, with the illustration, in particular, of two phenomena : drying shrinkage and swelling upon freezing, using a numerical model of concrete and the holographic interferometry.