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Theses

Développement de modèles multi-échelle et multi-physiques pour la conception de composites à base de liège

Abstract : This thesis focuses on the development of multi-scale and multi-physical models of the cork agglomerate with the aim of developing a first contribution to characterise the behaviour of cork-based composites. This work contributes to the development of new design methods based on systematic approaches. The thesis’s work is focused on white agglomerates. A first 2D numerical model of the agglomerate at the mesoscopic scale has been developed in order to understand the local thermomechanical behaviour of cork granules. This made it possible to study the influence of some design parameters on the thermoelastic properties of the agglomerate at the macroscopic scale. Following this first work, the 2D numerical model of the agglomerate has been generalised and a new 3D numerical model has been proposed. A homogensation strategy, based on a stochastic approach, has been introduced to study the influence of the variability of the elastic properties of natural cork on the elastic properties of the agglomerate as a function of temperature. The results obtained thanks to these works can be useful for the design of the agglomerate by the trial/error method. Finally, the pre-stress state into the agglomerate, made by the compression moulding, has been evaluated by means of the simulation of the compression process. The proposed approach is based on a simulation of the mould filling phase followed by a compression phase. The time dependent stress-strain curves of the granulate, at different strain states, represent a first useful result as input data in a design approach that takes into account the effects of manufacturing process.
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Submitted on : Monday, July 11, 2022 - 12:01:15 PM
Last modification on : Friday, August 5, 2022 - 2:54:01 PM

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  • HAL Id : tel-03719513, version 1

Citation

Marco Delucia. Développement de modèles multi-échelle et multi-physiques pour la conception de composites à base de liège. Génie des procédés. HESAM Université, 2022. Français. ⟨NNT : 2022HESAE036⟩. ⟨tel-03719513⟩

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