Une modelisation du role des interfaces dans le comportement des composites a matrice metallique
Keywords:
MMC, damage, plasticity, interfaces, finite elementsAbstract
The overall behavior of metal matrix composites can be significantly influenced by the properties of the interphase zone between the matrix and the reinforcements. This study presents a model of interfacial debonding based on the introduction of an energy release rate. The debonding evolution is ruled by a Griffith criterion and the main material parameter associated with debonding is the interfacial energy. This model is incorporated in the F.E.M. analysis of a unit cell under axial tension. Size effects are built in the model. It demonstrates that an optimal value of the interface energy can be defined for which the local strain field approaches homogeneity and therefore delays strain localization effects and improves the composite overall ductility.
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