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Mécanismes d'imprégnation en milieux fibreux : Modélisation et application à la mise en oeuvre des matériaux composites à fibres longues

Abstract : The aim of this work is to contribute in improving fibrous preforms impregnation for Liquid Composite Molding (LCM) processes. Theoretical and experimental investigations were focused on void that may be appearing during resin injection. Voids or bubbles are mainly formed due to the flow competition inside and outside the yarns. However, the experimental characterization of void formation and transport through the flow inside a fibrous media remains delicate. Since the direct visualization of the liquid flow and the entrapped bubbles in a practical material is uneasy, we use model networks to study the formation of bubbles and their transport. For our experimental studies, a multi-scales approach was adopted considering microfluidic and millifluidic analysis where wetting forces are significant. The obtained results show the influence of those forces on the bubble formation and transport mechanism. A simple model taking into account the interconnectivities between micropore and macropore was suggested. Several geometrical configurations and different flow regimes could be considered by the proposed model. Finally, using this simplified approach it can be possible to compare the forecast results and those obtained in the range of fibrous media impregnation and composites elaboration.
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https://tel.archives-ouvertes.fr/tel-00715952
Contributor : Mohamed Amine Ben Abdelwahed <>
Submitted on : Monday, July 9, 2012 - 3:30:43 PM
Last modification on : Tuesday, February 5, 2019 - 11:41:20 AM
Long-term archiving on: : Wednesday, October 10, 2012 - 3:50:11 AM

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  • HAL Id : tel-00715952, version 1

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Mohamed Amine Ben Abdelwahed. Mécanismes d'imprégnation en milieux fibreux : Modélisation et application à la mise en oeuvre des matériaux composites à fibres longues. Mécanique des matériaux [physics.class-ph]. Université du Havre, 2011. Français. ⟨tel-00715952⟩

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