Paper number 662

MICRO-MACRO MODELLING OF THE INFLUENCE OF THE DISCONTINUOUS REINFORCED COMPOSITES HETEROGENEITIES ON DAMAGE AND FAILURE PROPERTIES

K.Derrien, D.Baptiste

ENSAM, Laboratory LM3, CNRS ESA 8006
151 Bd de l'H˘pital, 75013 PARIS, France

Summary We studied the tensile behaviour and damage of an Aluminium alloy X2080 reinforced with different volume fraction of silicon carbide particles. We use an homogenisation method in order to predict the behaviour of this metal-matrix composites. The main damage mechanism is particle failure. We study the influence of an heterogeneous dispersion of the reinforcement on the damage development and the failure strain of composites which contain locally a higher volume fraction of reinforcement. We compare experimental and theoretical results. The originality of this work lies in the modelling of the failure using a micromechanical approach.
Keywords metal-matrix composites, fracture, damage, heterogeneous repartition, homogenisation method.

Theme : Mechanical and Physical Properties ; Damage Mechanics

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