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Influence de fibres courtes sur la microstructure et comportement mécanique d'un liège aggloméré

Abstract : A bio-sourced foam, agglomerated cork, was chosen to evaluate the influence of short fibres on the mechanical behaviour of cellular materials. To obtain the material, cork grains (with a diameter of between 0.5 and 1 mm) were mixed with a thermosetting resin. Short fibres (about 300μm long and 7μm in diameter) were then added before the uniaxial compression of the mixture. This results in a material with transverse anisotropy. The uniaxial compression behaviour of the reinforced material at a deformation rate of 4 10−3s−1was studied and compared to that of an unreinforced cork agglomerate. A more rigid foam is obtained. Young’s modulus increases by 26 and 70%for out-of-plane and in-plane directions, thanks to fibres. Observation of the microstructure of the material reveals a particular organization of short fibers at the grain interfaces. By orienting themselves mainly in the plane (Oxy), the fibres form an anisotropic networkwhich is added to the anisotropy of the material. However, the deformation mechanisms do not seem to be modified by this addition of reinforcements.
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Submitted on : Friday, December 20, 2019 - 10:15:16 AM
Last modification on : Thursday, January 6, 2022 - 3:46:56 AM
Long-term archiving on: : Saturday, March 21, 2020 - 2:42:49 PM

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  • HAL Id : hal-02420739, version 1

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Louise Le Barbenchon, Jean-Benoit Kopp, Jérémie Girardot, Agnès de Montbrun, Romain Quinton, et al.. Influence de fibres courtes sur la microstructure et comportement mécanique d'un liège aggloméré. 21ème Journées Nationales sur les Composites, École Nationale Supérieure d'Arts et Métiers (ENSAM) - Bordeaux, Jul 2019, Bordeaux, Talence, France. ⟨hal-02420739⟩

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