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Évaluation des capacités prédictives d’un modèle avancé pour la prévision de la tenue de plaques stratifiées perforées

Abstract : This work focuses on laminated composite open-hole tensile strength prediction, with a new generation carbon/epoxy material. This PhD takes part in a project named MARCOS, led by ONERA and DASSAULT AVIATION.It aims at proposing a fair level of complexity approach to predict laminated composite open-hole tensile strength in order to reduce design office criteria conservatism and performing its validation on industrial test cases. Open-hole tensile test and analysis available in the scientific literature show that matrix cracking and delamination are two mechanisms acting on final failure. We will first perform a mechanical test campaign to characterize the studied material. A material model, written at the ply scale will be proposed.Damage is described thanks to a crack density variable, the model identification will rely on the experimental test results.Numerical difficulties occurring in finite-element computations using advanced approaches will be investigated.Then, an experimental open-hole tensile test campaign led by ONERA and DASSAULT AVIATION, will exhibit a hole size effect, as commonly observed on composite materials, but also a width effect. The width effect consists in a strength increase when the ratio between the open-hole width and the hole diameter is greater than 5 Very few studies focused on the width effect, hence, it will be investigated. We will then use the important instrumentation used on these test to explain this effect and evaluate the proposed approach predictive capabilities.
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Submitted on : Friday, September 18, 2020 - 3:01:14 AM
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Jérémy Germain. Évaluation des capacités prédictives d’un modèle avancé pour la prévision de la tenue de plaques stratifiées perforées. Mécanique des solides [physics.class-ph]. Université Paris-Saclay, 2020. Français. ⟨NNT : 2020UPASN004⟩. ⟨tel-02941547v2⟩

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