Paper number 1129
|CHARACTERIZATION AND DAMAGE EVOLUTION OF S.M.C COMPOSITES MATERIALS BY ULTRASONIC METHOD|
M. SAYARI, D.BAPTISTE, M. BOCQUET AND J.FITOUSSI
Laboratoire de Microstructure et Mécanique des Matériaux, URA CNRS 1219, ENSAM,
151, Bd de l'hôpital 75013 Paris, FRANCE
|Summary||An experimental investigation coupled to a micromechanical approach are described in this paper in order to study the damage behaviour of a randomly short-fiber SMC composite subjected to a tensile test. The experimental investigation is based on the ultrasonic technique which allow us to determine the nine elastic constant of an orthotropic material. The damage mechanisms of this kind of composite are identified and related to the anisotropic degradation of the material. A micro-macro relation based on Mori and Tanaka's model is developed to evaluate the overall stiffness tensor of the composite and its anisotropic degradation due to fiber/matrix interface damage. Moreover, we propose an inverse method using the ultrasonic measurement which is able to evaluate the fiber/matrix failure properties.
||Keywords|| ultrasound, elastic constants, anisotropic damage, fiber/matrix interface, multi-scale model.
Theme : NDE and Reliability ; Ultrasonic Inspection
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