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Caractérisation mécanique et suivi par émission acoustique des mécanismes d’endommagement des composites à fibres hybrides lin/carbone

Abstract : The use of natural fibers as reinforcement makes it possible to improve the environmental performance of the composite materials as well as their damping properties. Nevertheless, these natural fiber composites have lower mechanical performance than synthetic fiber composites. In this context, this study proposes to develop composite structures with hybrid reinforcement made of flax and carbon fibers. The objective of this hybridization is to find a compromise between the mechanical and dissipative properties. First, the static behavior of flax fiber, carbon fiber and flax/carbon hybrid composites was analyzed. The principal elastic characteristics of a UD ply in plane stresses are thus determined. Moreover, a monitoring and an analysis of the mechanisms of damage were carried out by means of the technique of acoustic emission associated with microscopic observations. In order to better meet industrial needs, the behavior of composites subjected to cyclic fatigue tests must be studied. In fact, the fatigue behavior of these materials with non-hybrid and hybrid reinforcements was analyzed under tensile stress and three-point bending. The influence of hybridization on the fatigue life of these composites has been established. Finally, an experimental study and a finite element modeling of the vibratory behavior of non-hybrid and hybrid composites were carried out. Thus, the role of different fibers, fiber orientations, stacking sequences in vibration damping has been discussed.
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https://tel.archives-ouvertes.fr/tel-02886773
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Submitted on : Wednesday, July 1, 2020 - 5:53:10 PM
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2019LEMA1039.pdf
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  • HAL Id : tel-02886773, version 1

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Mariem Ben Ameur. Caractérisation mécanique et suivi par émission acoustique des mécanismes d’endommagement des composites à fibres hybrides lin/carbone. Acoustique [physics.class-ph]. Université du Maine; École nationale d'ingénieurs de Sfax (Tunisie), 2019. Français. ⟨NNT : 2019LEMA1039⟩. ⟨tel-02886773⟩

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