Plant fibre composites – porosity and stiffness |
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| Authors: | Bo Madsen Anders Thygesen Hans Lilholt |
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| Affiliation: | 1. Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, P.O. 49, 4000 Roskilde, Denmark;2. Biosystems Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, P.O. 49, 4000 Roskilde, Denmark;1. School of Aerospace, Mechanical & Manufacturing Engineering, RMIT University, GPO Box 2476, Melbourne, Australia;2. Institute for Materials Research and Innovation, University of Bolton, Bolton BL3 5AB, UK;1. School of Engineering, University of Borås, SE-501 90 Borås, Sweden;2. Department of Materials Science, Tampere University of Technology, P.O. Box 589, FI-33101 Tampere, Finland;1. KU Leuven – Department of Materials Engineering, Kasteelpark Arenberg 44 – bus 2450, 3001 Heverlee, Belgium;2. McGill University – Department of Mechanical Engineering, 817 Sherbrooke St. West, Montreal, Quebec H3A0C3, Canada |
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| Abstract: | Plant fibre composites contain typically a relatively large amount of porosity which influences their performance. A model, based on a modified rule of mixtures, is presented to include the influence of porosity on the composite stiffness. The model integrates the volumetric composition of the composites with their mechanical properties. The fibre weight fraction is used as an independent parameter to calculate the complete volumetric composition. A maximum obtainable stiffness of the composites is calculated at a certain transition fibre weight fraction, which is characterised by a best possible combination of high fibre volume fraction and low porosity. The model is validated with experimental data from the literature on several types of composites. A stiffness diagram is presented to demonstrate that the calculations can be used for tailoring and design of composites with a given profile of properties. |
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