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Modélisation numérique des procédés LCM à l’échelle des milieux homogènes équivalents en cours de déformation – intégration de la pression capillaire lors de l’infusion et équilibrage post-infusion

Abstract : The LRI process consists in impregnating a fibrous preform through its thickness, under the pressure gradient created by pulling the vacuum. This out-of-autoclave process was developed to reduce manufacturing costs and ensure proper filling of large parts; hence the increasing interest of the aeronautical industry in this technique. This work, within the framework of the Hexcel-Mines Saint-Etienne Chair, aims to establish a predictive numerical tool to simulate the main physical phenomena occurring during the process at macroscale. In order to properly model the complex and multi-scale phenomena during the infusion process, a numerical approach based on finite-element method is developed to model the capillary effects during the filling stage and to model the post-filling stage. Capillary effects are represented by a capillar stress tensor acting at the bi-fluid interface of the flow modelled by Darcy's equations. By generating a pressure jump, it requires a local pressure enrichment of the elements crossed by the fluid front. The results are validated with a convergence analysis and a confrontation with experimental data. The model is adapted to the mesoscale to simulate the flow through the tows. A first approach of post-filling stage modeling is proposed, which describes the interaction between the preform deformation and the resin flow after the filling. Modeling this stage allows to study the influence of fluid-solid coupling on the final part regarding the dimensional tolerances, and to predict the evolution of the fibre volume fraction which determines the part mechanical properties. The first simulation tests reveal a high potential for industrial simulators.
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https://tel.archives-ouvertes.fr/tel-02921453
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Submitted on : Tuesday, August 25, 2020 - 11:18:02 AM
Last modification on : Thursday, August 27, 2020 - 3:06:29 AM

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Koloina Andriamananjara. Modélisation numérique des procédés LCM à l’échelle des milieux homogènes équivalents en cours de déformation – intégration de la pression capillaire lors de l’infusion et équilibrage post-infusion. Autre. Université de Lyon, 2019. Français. ⟨NNT : 2019LYSEM005⟩. ⟨tel-02921453⟩

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