Impregnation mechanisms in fibrous mediums: Modelling and application for the elaboration of composite materials with long fibers
Identifieur interne : 000341 ( Hal/Checkpoint ); précédent : 000340; suivant : 000342Impregnation 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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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Impregnation mechanisms in fibrous mediums: Modelling and application for the elaboration of composite materials with long fibers</title><title xml:lang="fr">Mécanismes d'imprégnation en milieux fibreux : Modélisation et application à la mise en oeuvre des matériaux composites à fibres longues</title><author><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><affiliation wicri:level="1"><hal:affiliation type="laboratory" xml:id="struct-56485" status="VALID"><orgName>Laboratoire Ondes et Milieux Complexes</orgName><orgName type="acronym">LOMC</orgName><desc><address><country key="FR"></country></address><ref type="url">http://www.univ-lehavre.fr/recherche/lomc/</ref></desc><listRelation><relation active="#struct-300317" type="direct"></relation><relation name="FRE1302" 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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><hal api="V3"><titleStmt><title xml:lang="en">Impregnation mechanisms in fibrous mediums: Modelling and application for the elaboration of composite materials with long fibers</title><title xml:lang="fr">Mécanismes d'imprégnation en milieux fibreux : Modélisation et application à la mise en oeuvre des matériaux composites à fibres longues</title><author role="aut"><persName><forename type="first">Mohamed Amine</forename><surname>Ben Abdelwahed</surname></persName><email>mohamed.ben-abdelwahed@univ-lehavre.fr</email><idno type="halauthor">742823</idno><affiliation ref="#struct-56485"></affiliation></author><editor role="depositor"><persName><forename>Mohamed Amine</forename><surname>Ben Abdelwahed</surname></persName><email>mohamed.ben-abdelwahed@univ-lehavre.fr</email></editor></titleStmt><editionStmt><edition n="v1" type="current"><date type="whenSubmitted">2012-07-09 15:30:43</date><date type="whenModified">2012-07-09 16:00:08</date><date type="whenReleased">2012-07-09 16:00:08</date><date type="whenProduced">2011-11-28</date><date type="whenEndEmbargoed">2012-07-09</date><ref type="file" target="https://tel.archives-ouvertes.fr/tel-00715952/document"><date notBefore="2012-07-09"></date></ref><ref type="file" n="1" target="https://tel.archives-ouvertes.fr/tel-00715952/file/ThA_se-BEN_ABDELWAHED-VF-21-05-12.pdf"><date notBefore="2012-07-09"></date></ref></edition><respStmt><resp>contributor</resp><name key="174518"><persName><forename>Mohamed Amine</forename><surname>Ben Abdelwahed</surname></persName><email>mohamed.ben-abdelwahed@univ-lehavre.fr</email></name></respStmt></editionStmt><publicationStmt><distributor>CCSD</distributor><idno type="halId">tel-00715952</idno><idno type="halUri">https://tel.archives-ouvertes.fr/tel-00715952</idno><idno type="halBibtex">benabdelwahed:tel-00715952</idno><idno type="halRefHtml">Mécanique des matériaux [physics.class-ph]. Université du Havre, 2011. Français</idno><idno type="halRef">Mécanique des matériaux [physics.class-ph]. Université du Havre, 2011. Français</idno></publicationStmt><seriesStmt><idno type="stamp" n="CNRS">CNRS - Centre national de la recherche scientifique</idno><idno type="stamp" n="UNIV-LEHAVRE">Université du Havre</idno></seriesStmt><notesStmt></notesStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Impregnation mechanisms in fibrous mediums: Modelling and application for the elaboration of composite materials with long fibers</title><title xml:lang="fr">Mécanismes d'imprégnation en milieux fibreux : Modélisation et application à la mise en oeuvre des matériaux composites à fibres longues</title><author role="aut"><persName><forename type="first">Mohamed Amine</forename><surname>Ben Abdelwahed</surname></persName><email>mohamed.ben-abdelwahed@univ-lehavre.fr</email><idno type="halAuthorId">742823</idno><affiliation ref="#struct-56485"></affiliation></author></analytic><monogr><imprint><date type="dateDefended">2011-11-28</date></imprint><authority type="institution">Université du Havre</authority><authority type="school">Ecole Doctorale SPMII Sciences Physiques, Mathématiques et de l'Information pour l'Ingénieur</authority><authority type="supervisor">Joël Bréard(joel.breard@univ-lehavre.fr)</authority><authority type="jury">Eric Arquis (président)</authority><authority type="jury">José Bico (rapporteur)</authority><authority type="jury">Christophe Binétruy (rapporteur)</authority><authority type="jury">Patrice Laure (examinateur)</authority><authority type="jury">Annie Colin (examinateur)</authority><authority type="jury">Laurent Bizet (co-encadrant)</authority><authority type="jury">Joël Bréard (directeur)</authority></monogr></biblStruct></sourceDesc><profileDesc><langUsage><language ident="fr">French</language></langUsage><textClass><keywords scheme="author"><term xml:lang="en">Impregnation mechanisms</term><term xml:lang="en">LCM processes</term><term xml:lang="en">Flow regimes</term><term xml:lang="en">Bubbles</term><term xml:lang="en">Model networks</term><term xml:lang="en">Wetting</term><term xml:lang="en">Interconnectivities</term><term xml:lang="fr">Mécanismes d'imprégnation</term><term xml:lang="fr">Procédés LCM</term><term xml:lang="fr">Régimes d'écoulement</term><term xml:lang="fr">Bulles</term><term xml:lang="fr">Réseaux modèles</term><term xml:lang="fr">Millifluidique</term><term xml:lang="fr">Mouillabilité</term><term xml:lang="fr">Inter-connectivités</term><term xml:lang="fr">Macropore</term><term xml:lang="fr">Micropore</term></keywords><classCode scheme="halDomain" n="phys.meca.mema">Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph]</classCode><classCode scheme="halDomain" n="spi.meca.mema">Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph]</classCode><classCode scheme="halTypology" n="THESE">Theses</classCode></textClass><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.</abstract><abstract xml:lang="fr">L'objectif de ce travail est de contribuer à l'amélioration des mécanismes d'imprégnation d'un renfort fibreux par une résine polymère dans les procédés de mise en œuvre de matériaux composites de type LCM (Liquid Composite Molding). Les études théoriques et expérimentales réalisées se sont focalisées sur les anomalies d'imprégnation pouvant apparaître lors des écoulements. Les défauts couramment observés sont des vides pouvant s'assimiler à des bulles et provenant, en partie, d'une compétition entre les régimes gouvernant les écoulements intra-mèche et inter-mèches. L'analyse de la formation et du transport des bulles au sein d'une structure fibreuse demeure délicate à réaliser du fait de l'architecture complexe de la préforme. Afin de s'exonérer des difficultés rencontrées lors de la visualisation au sein du renfort et pour répondre à cette problématique de vide créé, nous avons fait le choix d'étudier les mécanismes d'imprégnation ainsi que la formation et le transport de bulles dans des réseaux modèles. Une analyse multi-échelles a été adoptée pour nos expérimentations faisant appel à une approche micro et millifluidique où les forces de mouillabilité sont prépondérantes. Les résultats obtenus montrent, dans un premier temps, l'influence de ces forces dans les mécanismes de génération et de transport de bulles et permet de justifier certaines observations proposées dans ce sujet. Un modèle simple basé sur des configurations d'inter-connectivités micropore/macropore a été proposé. Ce modèle permet d'envisager différentes analyses paramétriques selon des configurations géométriques et des régimes d'écoulement variés. Sur cette base, il est possible de prendre en compte différents facteurs et de les comparer à certaines contributions de la littérature dans le domaine de l'imprégnation des milieux fibreux et de la mise en œuvre des composites.</abstract></profileDesc></hal></record>Pour manipuler ce document sous Unix (Dilib)
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