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Mécanique des milieux fibreux auto-enchevêtrés : application à un alliage à mémoire de forme de type Nickel-Titane

Abstract : The aim of this work is to process and characterize for biomedical applications,self-entangled structures made of a single NiTi shape memory fiber. We have optimizeda processing route consisting in entangling and shape-setting a spring bythermomechanical treatments. The samples were characterized in compression andtension, using optical and x-ray tomographic observations. The structures thus obtainedare homogeneous, isotropic, superelastic at room temperature up to strains ofat least 30%, and can become ferroelastic with a shape memory effect up to at least16% strain by an additional heat treatment. The mechanical behavior in compressionis first consolidating and then dilating, while in tension, the samples are slightlyauxetic. A comparison with similar media made of ductile and viscoelastic fibers,as well as with discrete element simulations on friction-free elastic fibers, show thatthe mechanical properties of these self-entangled structures are controlled by theirunique architecture, in-between continuous and discrete media.
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Submitted on : Friday, July 3, 2015 - 11:22:09 AM
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Benjamin Gadot. Mécanique des milieux fibreux auto-enchevêtrés : application à un alliage à mémoire de forme de type Nickel-Titane. Mécanique des structures [physics.class-ph]. Université Grenoble Alpes, 2015. Français. ⟨NNT : 2015GREAI010⟩. ⟨tel-01171240⟩

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