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Languages: French
Types: Article
Subjects: Matériaux composites, Conduction de la chaleur, Estimation de propriétés orthotropes, Thermographie infrarouge, Méthode inverse, 620.1
Dans un premier temps, le comportement thermique d’une structure composite constituée d’un renfort fibreux et d’une matrice en résine a été étudié. L’utilisation d’une méthode numérique basée sur le principe de la "plaque chaude gardée" permet alors de calculer les conductivités effectives d’un composite orthotrope en fonction de sa géométrie et de la nature de ses constituants dans le cas de configurations tridimensionnelles complexes. Le deuxième objectif de cette étude concerne la détermination expérimentale des propriétés thermophysiques de ces composites à renforcements orientés. A cette fin, un banc de mesure a été développé. Son principe repose sur l'observation par thermographie infrarouge de la face arrière d'un échantillon excité thermiquement sur sa face avant par l’application d’un flux de chaleur inhomogene. La mise en oeuvre d’une méthode inverse permet alors d’identifier simultanément les trois conductivités orthotropes et la capacité thermique de la plaque ainsi testée. Initially, the thermal behavior of a composite structure made up of a fibrous reinforcement and a resin matrix was studied. Then, the use of a numerical method based on the principle of the “guarded hot-plate” makes possible to calculate effective conductivities of an orthotropic composite in function its geometry and the nature of its components in the case of complex three-dimensional configurations. The second objective of this study is related to the experimental determination of the thermophysical properties of these composites materials. For this purpose, a testing bench was developed. its principle rests on the observation by infra-red thermography of the back face of a sample which is thermically excited on its front face by the application of an inhomogeneous heat flow. The implementation of an inverse method then makes it possible to simultaneously identify the three orthotropic conductivities and the heat capacity of the plate thus tested.
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