The influence of a thermoplastic toughening interlayer and hydrothermal conditioning on the Mode-II interlaminar fracture toughness of Carbon/Benzoxazine composites |
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| Affiliation: | 1. College of Aerospace Engineering, Chongqing Key Laboratory of Heterogeneous Material Mechanics, Chongqing University, Chongqing, 400044, PR China;2. The State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing, 400044, PR China;3. School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology (QUT), Brisbane, QLD 4001, Australia;4. College of Mechanical and Vehicle Engineering, Hunan University, Changsha 412008, PR China;1. North West Composites Centre, School of Materials, University of Manchester, Manchester M13 9PL, UK;2. Beijing Institute of Aeronautical Materials, Beijing, China;1. Faculty of Materials Science and Engineering, Warsaw University of Technology, ul. Wo?oska 141, 02-507, Warsaw, Poland;2. Air Force Institute of Technology, ul. Ksi?cia Boles?awa 6, 01-494, Warsaw, Poland;1. School of Mechanical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310, Johor Bahru, Malaysia;2. UTM Centre for Low Carbon Transport in Cooperation with Imperial College London, Universiti Teknologi Malaysia, 81310, Johor Bahru, Malaysia;3. Institute for Vehicle System & Engineering (IVeSE), Universiti Teknologi Malaysia, 81310, Johor Bahru, Malaysia |
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| Abstract: | Carbon fibre/Benzoxazine laminates with and without non-woven polyamide (PA) fibre veils at the interlaminar regions were manufactured using vacuum assisted resin transfer moulding (VARTM). The effect of the interlaminar thermoplastic veils on the Mode-II critical strain energy release rate (GIIC), under both wet and dry conditions, was determined using two commercially available Benzoxazine resins: a toughened system and an untoughened system. In all samples the toughened system outperformed the untoughened system. The overall resistance to Mode-II crack growth was significantly improved by the inclusion of the interlaminar veils due to an increase in the thickness of the matrix-rich interlaminar region, plastic deformation of the PA fibres and a crack-pinning mechanism. Moisture caused an increase in matrix ductility, which improved the resistance to crack initiation; however, this was counteracted by a reduction in fibre/matrix interfacial strength causing a reduction in resistance to crack growth. |
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| Keywords: | A Carbon fibre A Thermosetting resin B Fracture toughness B Environmental degradation |
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