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Transverse permeability of chopped fibre bundle beds
Affiliation:1. Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia;2. Center of Excellence NAMASTE, Jamova cesta 39, 1000 Ljubljana, Slovenia;3. Institute of Materials Science, Technische Universität Darmstadt, 64287 Darmstadt, Germany;1. Karlsruhe Institute of Technology, Institute of Vehicle System Technology, Karlsruhe, Germany;2. Karlsruhe Institute of Technology, Institute for Applied Materials, Karlsruhe, Germany;3. Karlsruhe Institute of Technology, Institute of Production Science, Karlsruhe, Germany;4. Western University, Dept. of Chemical & Biochemical Engineering, London, ON, Canada;1. Arts et Métiers Paris Tech, PIMM – UMR CNRS 8006, 151 Boulevard de l’Hôpital, 75013 Paris, France;2. Arts et Métiers Paris Tech, LEM3 – UMR CNRS 7239, 4 Rue Augustin Fresnel, 57078 Metz, France;3. Plastic Omnium Auto Exterior, Sigmatech, Sainte Julie, France;1. Fraunhofer ITWM, Fraunhofer-Platz 1, 67663 Kaiserslautern, Germany;2. Fraunhofer LBF, Bartningstrasse 47, 64289 Darmstadt, Germany;3. Fraunhofer EMI, Eckerstrasse 4, 79104 Freiburg, Germany;4. Fraunhofer IIS, Am Wolfsmantel 33, 91058 Erlangen, Germany;5. Fraunhofer IZFP, Campus E3.1, 66123 Saarbrücken, Germany;6. Fraunhofer ICT, Joseph-von-Fraunhofer-Strasse7, 76327 Pfinztal, Germany;7. Dept. of Chemistry, University of Basel, Klingelbergstr. 80, 4056 Basel, Switzerland
Abstract:The out-of-plane permeability of 25 mm-long chopped glass fibre bundle beds was measured. These bundles, used in sheet moulding compound (SMC) composites, have an elliptical cross-section with the major axis perpendicular to the flow direction. An adapted experimental set-up was developed, which prevented flow along the sides of the packed bundle bed. The set-up was tested with needled glass fibre mats, and satisfactory agreement was found with previous results. The transverse permeability of the loose SMC bundle beds was then measured and linked to the bundle sizing type, geometry and volume fraction. Finally, the results could be well described by models taking into account the elliptical nature of the bundles.
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