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<dc:title xml:lang="fr">Etude rhéologique de formulations thermodurcissables, pour la modélisation de procédés de type SMC</dc:title>
<dcterms:alternative xml:lang="en">Rheological study of thermoset formulations, for the modellisation of moulding processes like Sheet Moulding Compound</dcterms:alternative>
<dc:subject xml:lang="fr">Rhéologie</dc:subject>
<dc:subject xml:lang="fr">Rhéopexie négative</dc:subject>
<dc:subject xml:lang="fr">SMC</dc:subject>
<dc:subject xml:lang="fr">Viscosité dépendant du temps</dc:subject>
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<dc:subject xml:lang="fr">Viscosité</dc:subject>
<dc:subject xml:lang="en">Rheology</dc:subject>
<dc:subject xml:lang="en">Negative rheopexy</dc:subject>
<dc:subject xml:lang="en">SMC</dc:subject>
<dc:subject xml:lang="en">Time-dependant viscosity</dc:subject>
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<dcterms:abstract xml:lang="fr">Les travaux présentés s’axent autour de 2 chapitres indépendants : - le 1er concerne l’étude rhéologique d’une formulation pour SMC sans fibres. Cette étude permet d’élaborer des lois de comportement rhéologique. Ces lois sont ensuite insérées dans un code de calcul de simulation numérique afin de prédire les efforts mis en jeu lors d’une compression. Ces données simulées sont comparées avec des données de compression obtenues expérimentalement. - le 2ème se penche sur l’étude d’un comportement rhéologique rare : la rhéopexie négative. La viscosité de l’échantillon dépend de l’histoire de cisaillement qui lui est appliquée. Ce comportement est très sensible à la composition du mélange, et fait intervenir 4 constituants. Dès lors que l’un d’eux est retiré, le phénomène disparaît. Le mélange étudié est constitué de produits classiquement utilisés pour la production de SMC.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The research presented is divided into 2 independents chapters: - the 1st one focuses on the rheological study of a fibreless formulation for SMC. This study allows us to write constitutive equations of the formulation. These equations are in turn implemented in a numerical simulation program, in order to predict the forces generated during a compression experiment. These simulated data are eventually compared with experimental data obtained during compression.- the 2nd chapter concerns the study of a rare rheological behaviour: the negative rheopexy. The viscosity of the sample depends on its shear history, in a very different way than a thixotropic sample’s viscosity would. This rheological behaviour is very component sensitive, and results from the interactions between 4 components. As soon as one of them is missing, the negative rheopexy disappears. The mixture studied is constituted of products traditionally used for the production of SMC.</dcterms:abstract>
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