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<dc:title xml:lang="en">Surface recovery and reconstruction after deformation</dc:title>
<dcterms:alternative xml:lang="fr">La recouvrance et la reconstruction des surfaces après déformation</dcterms:alternative>
<dc:subject xml:lang="fr">Viscoélasticité</dc:subject>
<dc:subject xml:lang="fr">WLF</dc:subject>
<dc:subject xml:lang="fr">Courbes maîtresses</dc:subject>
<dc:subject xml:lang="fr">FEM</dc:subject>
<dc:subject xml:lang="fr">Lois de comportement</dc:subject>
<dc:subject xml:lang="fr">Indentation</dc:subject>
<dc:subject xml:lang="fr">Fluage</dc:subject>
<dc:subject xml:lang="fr">Relaxation</dc:subject>
<dc:subject xml:lang="fr">Recouvrance d’indentation</dc:subject>
<dc:subject xml:lang="fr">Recouvrance en rayure</dc:subject>
<dc:subject xml:lang="fr">PMMA</dc:subject>
<dc:subject xml:lang="fr">CR39</dc:subject>
<dc:subject xml:lang="en">Viscoelasticity</dc:subject>
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<dc:subject xml:lang="en">Indentation</dc:subject>
<dc:subject xml:lang="en">Creep</dc:subject>
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<dc:subject xml:lang="en">Indentation recovery</dc:subject>
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<dcterms:abstract xml:lang="fr">Les propriétés des polymères sont intéressantes pour des applications pneumatiques, de verres organiques, de joints, … Leurs propriétés mécaniques sont néanmoins mal comprises. Dans ce manuscrit, le comportement mécanique du PMMA et du CR39 est étudié en fonction du temps.Il en résulte des courbes maîtresses à partir d’expérience de relaxation de contrainte et de fluage d’indentation. D'autre part, le comportement mécanique au contact est analysé sur des expériences de fluage et recouvrance d’indentation et de rayures analysées pour la première fois dans cette thèse. Finalement, des lois de comportements sont construites, leurs précisions sont comparées grâce à des calculs par éléments finis aux expériences en contact.</dcterms:abstract>
<dcterms:abstract xml:lang="en">Polymer's low weight, deformability and easy manufacturing make them attractive materials for tire, organic glasses, sealing applications … Their mechanical properties are nonetheless poorly understood. In particular, two fields are searched over this thesis: time dependency and contact behavior for two transparent polymer: PMMA and CR39. The mechanical behavior time dependency is observed by the construction of stress relaxation and contact master curves. The mechanical contact behavior is analyzed by indentation creep and recovery experiments. Moreover the immediate scratch recovery is measured in the thesis. Finally, the uniaxial data is used to build constitutive laws, which accuracy is compared by Finite Element Modeling to contact tests.</dcterms:abstract>
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