Toughening effect of carbon nanotubes and carbon nanofibres in epoxy adhesives for joining carbon fibre laminates |
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| Affiliation: | 1. Foundation for the Research, Development and Application of Composite Materials (FIDAMC), Avda. Rita Levi-Montalcini 29, Getafe, 28906 Madrid, Spain;2. Department of Materials Science and Engineering, University Rey Juan Carlos, ESCET, c/Tulipán s/n, Móstoles, 28933 Madrid, Spain;1. Key Laboratory of Road Construction Technology and Equipment, MOE, Chang''an University, Xi''an 710064, PR China;2. School of Mechanical and Chemical Engineering, University of Western Australia, Perth, WA 6009, Australia;1. Mechanical Engineering Department, Necmettin Erbakan University, Konya, 42140, Turkey;2. Mechanical Engineering Department, Selcuk University, Konya, 42075, Turkey;1. Nanomaterials and Devices Research Laboratory, School of Nano Science and Technology, National Institute of Technology Calicut, NITC Campus P.O., Calicut, Kerala, 673 601, India;2. Department of Mechanical Engineering, National Institute of Technology Calicut, NITC Campus P.O., Calicut, Kerala, 673 601, India;3. Department of Mechanical Engineering, MLR Institute of Technology, Dundigal, Hyderabad, Telangana, 500 043, India |
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| Abstract: | The effect of carbon nanotubes (CNTs) and carbon nanofibres (CNFs) on mode I adhesive fracture energy (GIC) of double cantilever beam (DCB) joints of carbon fibre-reinforced laminates bonded with an epoxy adhesive has been studied. It was observed that the presence of carbon nanofillers in the epoxy adhesive results in a significant increase in the propagation value of mode I adhesive fracture energy with CNTs producing the largest increase. The toughening mechanisms, analysed using scanning electron microscopy (SEM), for the two nanofiller systems differed: pull-out with CNFs, and pull-out and crack bridging with CNTs. At the macroscopic level there was also a change in the failure mode, with an increased proportion of delamination occurring in the nanoreinforced joints in comparison with the unreinforced. Two different surface treatments were also applied to the laminates: grit blasting and atmospheric plasma. The highest fracture energy was obtained in the grit blasted joints. |
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| Keywords: | Carbon nanotubes Epoxides Surface treatment Fracture toughness Carbon nanofibres Scanning electron microscopy (SEM) |
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