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<dc:title xml:lang="fr">Propriétés physiques des empilements de fibres macroscopiques : une approche expérimentale, théorique et numérique</dc:title>
<dcterms:alternative xml:lang="en">Physical properties of macroscopic fiber bundles : an experimental, theoretical and numerical approach</dcterms:alternative>
<dc:subject xml:lang="fr">Fibre</dc:subject>
<dc:subject xml:lang="fr">Empilement de fibres</dc:subject>
<dc:subject xml:lang="fr">Physique statistique</dc:subject>
<dc:subject xml:lang="fr">Approximation de champ moyen</dc:subject>
<dc:subject xml:lang="fr">Désordre de forme</dc:subject>
<dc:subject xml:lang="fr">Propriétés mécaniques des matériaux</dc:subject>
<dc:subject xml:lang="fr">Propriétés électriques</dc:subject>
<dc:subject xml:lang="en">Fiber</dc:subject>
<dc:subject xml:lang="en">Bundle/stack of fibers</dc:subject>
<dc:subject xml:lang="en">Statistical physics</dc:subject>
<dc:subject xml:lang="en">Mean field approximation</dc:subject>
<dc:subject xml:lang="en">Shape disorder</dc:subject>
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<tef:elementdEntree autoriteExterne="198201400" autoriteSource="Sudoc">Empilements lamellaires</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">L'objectif de ce travail est de comprendre comment la forme intrinsèque des fibres individuelles contrôle les propriétés collectives des empilements, en particulier leurs propriétés mécaniques (élasticité) et électriques. Nous nous intéressons à des fibres longues, alignées selon une direction privilégiée et présentent un désordre de forme important. Notre étude est expérimentale et numérique. Nous proposons un modèle à deux dimensions, de champ moyen auto-cohérent, décrivant l'élasticité collective de l'empilement à partir des propriétés individuelles des fibres : leurs distribution de désordre ainsi que leurs module de courbure. Nous obtenons une équation d'état qui décrit avec un bon accord l'élasticité de nos empilements de fibres, sans paramètre ajustable, mais à un facteur multiplicatif près. Nous obtenons des résultats comparables entre les études expérimentale et numérique.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The purpose of this work is to understand how intrinsic shape of individual fibers controls the collective behavior of fiber stacks, in particular the mechanical (elasticity) and electrical properties. We consider long fibers, aligned towards one preferential direction with a significant disorder shape. Our study is experimental and numerical. We propose a two dimensions self consistent mean field model which describes the collective elasticity from the individual properties of fibers : the disorder distribution and the bending modulus. We obtain an equation of state which describes with a good agreement the stacks elasticity, without any fit parameters, however up to a multiplicative constant. We obtain similar results between experimental and numerical studies.</dcterms:abstract>
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