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Couplages fluide / milieu poreux en grandes déformations pour la modélisation des procédés d'élaboration par infusion

Abstract : In the present work, an overall model for the study of a non isothermal fluid flow across a highly compressible porous medium is proposed. This model is used here to study dry composite manufacturing processes by infusion across the fabric thickness (Liquid Resin Infusion-LRI and Resin Film Infusion- RFI ). These processes consist in mixing during the manufacturing stage, the reinforcements and the liquid resin transversely to the fabrics planes, yielding cost reductions while avoiding filling problems. These processes are however still poorly controlled and the characteristics of the finished part are not easily predictable (mainly the thickness and the porosity). A numerical predictive model would be a proper candidate to help in developing and finalizing new composite solutions with cost saving. Physically, liquid resin infusion is mainly induced across the compressed preform thickness, as a result of a pressure prescribed over the preform/resin stacking. From the modeling point of view, problems of this multiphysical analysis are two fold. First, one faces ill-posed boundary conditions, regarding the coupling of liquid regions, where a Stokes flow prevails, with the fibrous preform regions modeled as porous medium governed by a Darcy's law and a non-linear mechanical response. Second, the interaction phenomena due to the resin flow in the highly compressible preform are not classical. The model developed here includes a modified Beaver-Schaffman-Joseph condition to couple Stokes and Darcy zones, and is based on an ALE formulation of the liquid flow across the deformable porous medium in which finite strains are accounted for with an updated Lagrangian scheme. This mechanical model is also coupled with thermo-chemical models, accounting for resin reticulation under the temperature cycle. In the present work, numerical tools and new formulations have been developped in order to simulate the whole LRI or RFI process with a finite element software. These tools are studied individually and compared separately with analytical or other numerical results before being used in the LRI / RFI models. Numerical studies of infusion are then presented, commented, and a first comparison with experimental test is investigated.
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Submitted on : Friday, October 12, 2012 - 11:20:12 AM
Last modification on : Wednesday, June 24, 2020 - 4:18:19 PM
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  • HAL Id : tel-00741260, version 1


Pierre Celle. Couplages fluide / milieu poreux en grandes déformations pour la modélisation des procédés d'élaboration par infusion. Mécanique des matériaux [physics.class-ph]. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2006. Français. ⟨NNT : ⟩. ⟨tel-00741260⟩



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