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Etude du comportement mécanique à l’impact et en post impact de matériaux composites à fibres végétales

Abstract : The purpose of this PhD project is to study and analyze the mechanical behavior during the impact and post-impact of plant-fiber based composite materials. The conduct of this thesis requires: The manufacturing and characterization of the materials involved in the study : The materials are composed of plant-fiber fabrics (flax and/or hemp) impregnated with thermosetting resin (epoxy type) or thermoplastic resin (PP or PLA). These are manufactured using the vacuum infusion process or using thermocompression, depending on the resin. The materials are plate-shaped. The mechanical characterization will be performed using static mechanical testing and impact testing with a drop tower (over several energy levels). This will be first conducted on unmodified specimens (unimpacted and unaged, with and without fiber reinforcement) then on degraded specimens (impacted with a known energy and/or aged in humidity and temperature). The characterization of damage: It will, from the analysis of the images associated to the techniques of the acoustic emission, locate and identify the various damage mechanisms that intervene in these materials during different stresses. This study will lead to define the degree of harmfulness of such damage while associating to the approach the influence of microstructural parameters such as the nature of the fiber reinforcement and the components (resin and fibers). The identification of behavioral patterns: It consists in suggesting a method to identify the material parameters of behavioral patterns while taking into account the damage level of the material's microstructure (resin and fiber strands). This study will lead to the implementation of a finite element model updating-like method using experimental databases such as kinematic field measurements. The ultimate purpose is to have reliable and predictive models in order to calculate the structures of such materials in the industry
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Submitted on : Monday, May 20, 2019 - 3:45:04 PM
Last modification on : Friday, November 6, 2020 - 3:27:07 AM


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  • HAL Id : tel-02016447, version 2



Amélie Cuynet. Etude du comportement mécanique à l’impact et en post impact de matériaux composites à fibres végétales. Mécanique des matériaux [physics.class-ph]. Université Grenoble Alpes, 2018. Français. ⟨NNT : 2018GREAA017⟩. ⟨tel-02016447v2⟩



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