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Theses

Endommagement par fatigue et durée de vie de structures en matériaux composites à fibres continues pour application liaison au sol

Abstract : The reduction of fuel consumption and greenhouse gas emissions is one of the most important challenges facing the automotive industry. An efficient strategy to meet these targets is by reducing the weight of vehicle. In this work, we are interested in introducing composite materials in automotive structural parts and especially in suspensions which are subjected in service to high-cycle fatigue loadings. Therefore, a good prediction of fatigue life is required. As continuous fibre-reinforced composites provide good mechanical properties combined with a low density, they have been increasingly used in many lightweight structures. However, the fatigue behaviour of composites has not been widely investigated. This work aims at developing an approach to predict the lifetime in service of structural automotive components, made with woven glass / epoxy composite. This approach has to be easy to use by design engineers at the scale of the structure. The first step is the characterization of the material. Then, the processes involved in degradation of the composite subjected to both monotonic and cyclic loadings were identified.Given the experimental results and the existing approaches, a multiaxial fatigue criterion is proposed. An optimization of the identification protocol is also performed to reduce the quantity of needed experimental data. Finally, the fatigue life prediction model criterion is validated by tests on notched coupons and on composite vehicle's suspension.
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https://pastel.archives-ouvertes.fr/tel-03081259
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Submitted on : Friday, December 18, 2020 - 9:55:58 AM
Last modification on : Sunday, December 20, 2020 - 3:29:34 AM

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  • HAL Id : tel-03081259, version 1

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Rim Ben Toumi. Endommagement par fatigue et durée de vie de structures en matériaux composites à fibres continues pour application liaison au sol. Matériaux. Ecole Nationale Supérieure des Mines de Paris, 2015. Français. ⟨NNT : 2015ENMP0064⟩. ⟨tel-03081259⟩

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