Impregnation mechanisms in fibrous mediums: Modelling and application for the elaboration of composite materials with long fibers
Identifieur interne : 000717 ( Main/Exploration ); précédent : 000716; suivant : 000718Impregnation mechanisms in fibrous mediums: Modelling and application for the elaboration of composite materials with long fibers
Auteurs : Mohamed Amine Ben Abdelwahed [France]Source :
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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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mechanisms</term><term>Interconnectivities</term><term>LCM processes</term><term>Model networks</term><term>Wetting</term></keywords><keywords scheme="mix" xml:lang="fr"><term>Bulles</term><term>Inter-connectivités</term><term>Macropore</term><term>Micropore</term><term>Millifluidique</term><term>Mouillabilité</term><term>Mécanismes d'imprégnation</term><term>Procédés LCM</term><term>Régimes d'écoulement</term><term>Réseaux modèles</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">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.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Haute-Normandie</li><li>Région Normandie</li></region><settlement><li>Le Havre</li></settlement><orgName><li>Université du Havre</li></orgName></list><tree><country name="France"><region name="Région Normandie"><name sortKey="Ben Abdelwahed, Mohamed Amine" sort="Ben Abdelwahed, Mohamed Amine" uniqKey="Ben Abdelwahed M" first="Mohamed Amine" last="Ben Abdelwahed">Mohamed Amine Ben Abdelwahed</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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