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Approche multimodèle pour la conception de structures composites à renfort tissé

Abstract : In order to optimize aeronautic structures, the manufacturing process must be tailored to the structural needs, with the aim of reducing the density/performance ratio. Polymer composites with woven reinforcements offer a large flexibility due to a vast choice of constituent materials and manufacturing process parameters. However, to entirely exploit their potential, new design methods specifically adapted to this type of material have to be developed. For this purpose, a modeling chain is proposed, which is able to predict the elastic properties of the intact or damaged material, by incorporating the manufacturing process parameters. The chain is built at the mesoscopic scale, to take into account the reinforcement geometry. A special procedure to generate finite element (FE) meshes of mesoscopic representative unit cells of woven composites has been developed, which links the deformation of the reinforcement, obtained from FE calculations, to the other models of the chain (resin injection, curing, and mechanical behavior). Two materials are studied to show the potential of the modeling chain: A four ply lay-up of a plain weave and of a satin weave fabric are considered, each of them having several compaction ratios and different nesting between the plies. With the aim of a validation of the modeling chain, multi-instrumented experimental tests have been carried out on several multi-layer plain weave composites with different thicknesses. In future applications, the proposed strategy will be placed in a toolbox able to design optimum woven composite structures based on local performance requirements.
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Submitted on : Monday, December 16, 2013 - 2:17:10 PM
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  • HAL Id : tel-00919198, version 1

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Gaël Grail. Approche multimodèle pour la conception de structures composites à renfort tissé. Autre. Université d'Orléans, 2013. Français. ⟨NNT : 2013ORLE2014⟩. ⟨tel-00919198⟩

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