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Analyse rapide d’images 3D de matériaux hétérogènes : identification de la structure des milieux et application à leur caractérisation multi-échelle

Abstract : Digital simulation is a wide-spreading tool for composite materials design and choice. Indeed it allows to generate and test digitally various structures more easily and quickly than with real manufacturing and tests processes. A feedback is needed following the choice and the fabrication of a virtual material in order to simultaneously validate the simulation and the fabrication process. With this aim, models similar to generated virtual structures are obtained by digitization of manufacturing materials. The same simulation algorithms can then be applied and allow to verify the forecasts. This thesis is also about the modelling of composite materials from 3D images, in order to rediscover in them the original virtual material. Image processing methods are applied to images to extract material structure data, i.e. each constituent localization, and orientation if applicable. These knowledge theoretically allow to simulate thermal and mechanical behavior of structures constituted of studied material. However to accurately represent composites requires practically a very small discretization step. Therefore behavior simulation of a macroscopic structure needs too much discretization points, and then time and memory. Hence a part of this thesis focuses also on determination of equivalent homogeneous material problem, which allows, when resolved, to lighten calculation time for simulation algorithms.
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https://tel.archives-ouvertes.fr/tel-01431187
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Submitted on : Tuesday, January 10, 2017 - 3:38:34 PM
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Amaury Walbron. Analyse rapide d’images 3D de matériaux hétérogènes : identification de la structure des milieux et application à leur caractérisation multi-échelle. Mathématiques générales [math.GM]. Université d'Orléans, 2016. Français. ⟨NNT : 2016ORLE2015⟩. ⟨tel-01431187⟩

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