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Description multi-échelles du comportement mécanique d'un matériau cellulaire composite sous sollicitations sévères. Application aux agglomérés de liège pour l'aéronautique.

Abstract : In order to lightening structures, the improvement and reinforcement of materials are becoming a growing concern in the aeronautics and aerospace industries. The suitability of certain materials to sweep across a wide spectrum of physical properties would make it possible to bring substantial mass savings to many existing applications. Agglomerated cork is one of these versatile materials thanks to its chemical composition and natural cellular structure. It is thus today considered for shock absorption applications and the addition of fibre reinforcements could be a way of improving its performance.The study of the absorption capacity of this material according to temperature and strain rate allows us to refine our understanding of the mechanical behaviour of multi-scale polymeric cellular materials under severe loading. The characterisation of the structure at different scales has highlighted the highly heterogeneous character of cork agglomerates as well as a strongly oriented mesoscopic structure. Mechanical tests in quasi-static regime carried out at different scales of observation showed the predominant role of this mesostructure on the mechanisms of deformation, damage and rupture, in compression as well as in tension at breakage.In order to study the coupled influence of strain rate and temperature, the visco-elastic behaviour of the materials making up the agglomerates was investigated using double sweep vibration tests in time and temperature (DMA tests). A set-up specifically designed for this work made it possible to carry out compression tests in dynamic regime (70 to 250 s-1) at different temperatures (from 20 to 73°C) in order to try to decorrelate material and structure effects in the dependence of polymeric cellular materials on the strain rate.
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https://pastel.archives-ouvertes.fr/tel-03359749
Contributor : Abes Star :  Contact
Submitted on : Thursday, September 30, 2021 - 2:39:25 PM
Last modification on : Friday, January 21, 2022 - 3:29:34 AM

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  • HAL Id : tel-03359749, version 2

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Louise Le Barbenchon. Description multi-échelles du comportement mécanique d'un matériau cellulaire composite sous sollicitations sévères. Application aux agglomérés de liège pour l'aéronautique.. Mécanique des solides [physics.class-ph]. HESAM Université, 2020. Français. ⟨NNT : 2020HESAE048⟩. ⟨tel-03359749v2⟩

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