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Fatigue-fluage du Polyamide 6,6 renforcé

Abstract : This work aims at completing the existing description and understanding of the fatigue behavior and damage mechanisms of short-glass fibers reinforced thermoplastic polymers.After a state of the art review the work focuses on the evaluation of fatigue and quasi-static damage mechanisms in SFRP as observed by micro-tomography and microscopy.In order to fully address the polymer damage mechanisms additional observations are performed on the neat polymer matrix and evidence a full scenario of intra-spherulitic fatigue damage growth.Microstructure modeling is used to complete the understanding of damage mechanisms accordingly to local mechanical fields.Based on the similarities of fatigue damage mechanisms with those observed for creep loading, a fatigue life assessment model based on the cyclic strain rate is introduced.It proved very effective at unifying the SFRP fatigue behavior over a wide range of loading conditions including R ratio effect, frequency effect, fiber orientation effect and humidity.The proposed criterion is also adapted for application to notched specimens and yielded promising results.
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  • HAL Id : tel-02612939, version 2

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Ilan Raphael. Fatigue-fluage du Polyamide 6,6 renforcé. Autre [cond-mat.other]. Ecole nationale supérieure d'arts et métiers - ENSAM, 2019. Français. ⟨NNT : 2019ENAM0048⟩. ⟨tel-02612939v2⟩

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