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Matériaux composites à fibres courtes : relation entre facteur d'orientation et propriétés mécaniques et thermiques

Abstract : The behavior of short fibers composite materials depends strongly of the orientation of the fibers. Using magnetic fields, anisotropic composite materials have been elaborated which contained up to 20 vol% of carbon fibers. One aim was to gain a better understanding of the process of orientation in the magnetic field. A model has been formulated to describe the movement of a single fiber which is exposed to a static and an oscillating magnetic field. Other parameters such as viscosity of the liquid polymer, temperature and fiber length were examined as well. The degree of anisotropy of the materials is measured by microscopy coupled to an optical imaging system, this work leading to define a procedure of filtering the image in order to obtain precisely the fiber orientation distribution (function). As well as the thermal conductivity was measured which is related to the three-dimensional orientation. The results from optical and thermal measurements correlate well, but the theoretical models to interpret the thermal conductivity are not yet reliable enough to allow the degree of orientation to be reduced from the measurements. Regarding the mechanical properties the increase of the YOUNG's modulus was measured and correlated with the fiber orientation distribution. Between the mechanical models tested some are found to agree well with the experiments
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Submitted on : Tuesday, April 24, 2018 - 3:42:56 PM
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  • HAL Id : tel-01775783, version 1



Yves Bour. Matériaux composites à fibres courtes : relation entre facteur d'orientation et propriétés mécaniques et thermiques. Autre. Université Paul Verlaine - Metz, 1999. Français. ⟨NNT : 1999METZ006S⟩. ⟨tel-01775783⟩



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