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Analyse multi-échelles du comportement mécanique d’un éco-composite, constitué d’une matrice à base de résine thermoplastique renforcée de fibres de lin

Abstract : The search for alternative solutions to the use of composites wholly or partly derived from renewable resources represents a major environmental challenge and a lever for economic development for future generations. The present study considers the choice of a bio-based composite made from flax fibers associated with a thermoplastic resin. The objective of the research is to analyze the overall mechanical behavior, to identify the main observed physical phenomena, then to analyze their associated mechanisms. An experimental analysis of the mechanical behavior in static and fatigue of unidirectional and cross laminate composites is presented. The techniques of the acoustic emission and micro-meso-macroscopic observations are the main means used for the characterization of the damage phenomena. Then, an experimental study of the vibratory behavior of the composite beams is realized. At first, the dynamic properties of stratified, healthy and damaged composites were determined. Namely, the flexural modulus and the loss factor are evaluated from the frequency responses obtained in linear mode. In a second step, the nonlinear vibration behavior of healthy and damaged composites is explored. Finally, an analytical model that takes into account the components specific to elasticity, plasticity, damage and coupling parameters is identified and used to simulate the overall mechanical behavior of the composite material. Predictive numerical simulations are proposed to evaluate the effect of impact stresses at low speeds / energies on the mechanical behavior of the studied composites.
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  • HAL Id : tel-02886625, version 1

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Mondher Haggui. Analyse multi-échelles du comportement mécanique d’un éco-composite, constitué d’une matrice à base de résine thermoplastique renforcée de fibres de lin. Acoustique [physics.class-ph]. Université du Maine; École nationale d'ingénieurs de Sfax (Tunisie), 2019. Français. ⟨NNT : 2019LEMA1037⟩. ⟨tel-02886625⟩

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