Effect of carbon nanotube modified epoxy adhesive on CFRP-to-steel interface |
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| Affiliation: | 1. Sir Lawrence Wackett Aerospace Research Centre, School of Engineering, RMIT University, GPO Box 2476, Melbourne, VIC 3001, Australia;2. Department of Mechanical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK;3. School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney NSW 2052, Australia;1. College of Architecture and Civil Engineering, Xihua University, Chengdu 610039, China;2. Department of Civil and Environmental Engineering, North Dakota State University, Fargo, ND 58105, USA;1. School of Mechanical and Materials Engineering, University College Dublin, Dublin, Ireland;2. Department of Mechanical Engineering, Imperial College London, SW7 2AZ, UK;3. FAC Technology, London, UK |
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| Abstract: | The effects of carbon nanotube (CNT) modified epoxy adhesive on CFRP-to-steel interfaces were investigated using double strap joints. The bond behaviours studied were failure modes, bond interface at microlevel, bond strength, effective bond length, CFRP strain distribution and bond-slip relationships.For the first time, a novel type of failure in the CFRP-steel joint was discovered, attributable to weak bonding between woven mesh and CFRP fibres. This failure mode prevented exploitation of the full potential of the carbon fibres and the CNT modified epoxy adhesive. Joints bonded with CNT-epoxy adhesive had an effective bond length of about 60 mm, whereas that of joints bonded with pure epoxy was about 70 mm. The CNT-epoxy adhesive can transfer more load from the host structure to the bonded CFRP laminates, consequently modifying bond behaviour. It is therefore expected that CNT-epoxy nanocomposites will assist in the strengthening and rehabilitation of steel infrastructures using CFRP laminates. |
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| Keywords: | A Carbon fibre A Particle-reinforcement B Interface/interphase D Mechanical testing |
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