Assessment of semi-impregnated fabrics in honeycomb sandwich structures |
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| Authors: | S Sequeira Tavares V Michaud J-AE Månson |
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| Affiliation: | 1. IMDEA Materials Institute, C/Eric Kandel 2, 28906 Getafe, Madrid, Spain;2. Department of Materials Science, Polytechnic University of Madrid, E. T. S. de Ingenieros de Caminos, 28040 Madrid, Spain;1. Institute for Carbon Composites, Technische Universität München, Faculty of Mechanical Engineering, Boltzmannstrasse 15, D-85748 Garching b. München, Germany;2. Department of Mechanical Engineering, McGill University, 817 Sherbrooke St. West, Montreal, Quebec H3A 0C3, Canada;1. School of Polymer Engineering, Institute of Engineering,Suranaree University of Technology, Nakhon Ratchasima, Thailand;2. Center of Excellence on Petreochemical and Materials TechnologyChulalongkorn University Bangkok, Thailand |
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| Abstract: | Semi-impregnated fabrics, or semipregs, are fabrics alternating dry and resin impregnated areas along the fibre bed surface. Due to their increased initial through thickness permeability to gas flow, these could constitute an alternative to prepreg in the skins of vacuum-bagged honeycomb sandwich structures, reducing the pressure in the honeycomb. The semipreg through thickness air permeability before cure is measured and is approximately three orders of magnitude higher than that of a unidirectional prepreg impregnated with the same resin. A model is proposed for the air permeability change during cure, as dry areas get infiltrated. Due to resin pouring inside the honeycomb cells, this type of semipreg is viable as a skin only if combined with a material that has low permeability to resin, e.g., a prepreg. |
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