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Analyse des mécanismes d'endommagement et du comportement vibratoire d'un composite à constituants naturels dans un environnement hydrique

Abstract : In recent decades, polymer composites reinforced with plant fibers have received significant attention from scientists. The use of reinforcing vegetable fibers makes it possible to improve the environmental performance of these materials reaching higher specific properties. Nevertheless, a major lock still hinders the development of these materials. Indeed, their sensitivity to water ageing, due to their hydrophilic nature, restricts their use. In this context, we propose, as part of this thesis, to analyze the effect of water ageing on static and dynamic behavior, to identify and monitoring the damage mechanisms of a sandwich structure biobased and its constituents. The composites used consist of a greenpoxy resin associated with flax fibers and a cork core for sandwich materials. In the first part of this work, we studied the static an dynamic behavior of the resin, the composites, cores and sandwich structures. This study led on the one hand to the determination of the mechanical characteristics and to the identification and the follow-up of the mechanisms of damage by acoustic emission and microscopic observations and on the other hand to the determination of the dynamic characteristics. In the second part, we first analyzed the kinetics of water diffusion in resin, skins, cores and sandwichs by identification of their diffusion parameters by the Fick model approach. Then, we are interested in the impact of water ageing on the behavior and mechanical properties iof sandwichs and its constituents.
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Submitted on : Wednesday, October 9, 2019 - 3:54:16 PM
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Malloum Abakar. Analyse des mécanismes d'endommagement et du comportement vibratoire d'un composite à constituants naturels dans un environnement hydrique. Acoustique [physics.class-ph]. Université du Maine, 2019. Français. ⟨NNT : 2019LEMA1020⟩. ⟨tel-02309804⟩

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