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Modélisation thermomécanique visco-hyperélastique du comportement d'un polymère semi-cristallin : application au cas d'une matrice polyamide 6.6

Abstract : This study focuses on a Polyamide 6.6 matrix, used in short glass fibre reinforced materials, and consists of the development of a thermo mechanical constitutive model relevant for conditions close to α transition. First part consists in experimental characterization of thermo mechanical behaviour of the material. Tensile and shear tests were used, where significant effort has been devoted to experimental protocol. Strain field measurements and temperature tracking with pyrometer have been used, for example. Experimental data base was built taking opportunity from the well-known time-temperature superposition principle. Tests were performed at temperatures ranging from Tα-30° to Tα +30°C, and for constant strain-rates ranging from 10-4 to 10 s-1. That represents 21 decades, by using an equivalent strain-rate at a reference temperature. Second part consists in proposing a constitutive model, in a complete thermodynamics framework, physically motivated, using Edwards-Vilgis' network theory. Inelasticity derives from microstructural changes through the evolution of constitutive parameters which is compensated by relaxation of elastic energy. Proposed model takes into account strong thermo-mechanical coupling, and with a reduce number of parameters, allows a good correlation with thermal and mechanical experimental data.
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Submitted on : Monday, July 9, 2012 - 10:12:03 AM
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  • HAL Id : pastel-00715693, version 1

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Erwan Baquet. Modélisation thermomécanique visco-hyperélastique du comportement d'un polymère semi-cristallin : application au cas d'une matrice polyamide 6.6. Matériaux. École Nationale Supérieure des Mines de Paris, 2011. Français. ⟨NNT : 2011ENMP0101⟩. ⟨pastel-00715693⟩

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