Fracture toughness improvement of CFRP laminates by dispersion of cup-stacked carbon nanotubes |
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| Authors: | Tomohiro Yokozeki Yutaka Iwahori Masaru Ishibashi Takashi Yanagisawa Kazunari Imai Masahiro Arai Tatsuhiro Takahashi Kiyoshi Enomoto |
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| Affiliation: | 1. Department of Aeronautics and Astronautics, The University of Tokyo, 7-3-1-Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;2. Aerospace Research and Development Directorate, Japan Aerospace Exploration Agency, Japan;3. Nano Technology Development Project, GSI Creos Corporation, Japan;4. Composite Group, Arisawa Manufacturing Co., Ltd., Japan;5. Department of Mechanical Systems Engineering, Shinshu University, Japan;6. Department of Organic Device Engineering, Yamagata University, Japan;g R & D Institute of Metals and Composites for Future Industries, Japan |
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| Abstract: | Several techniques are introduced to enhance the interlaminar fracture toughness of CFRP laminates using cup-stacked carbon nanotubes (CSCNTs). Prepared CSCNT-dispersed CFRP laminates are subject to Double Cantilever Beam (DCB) and End Notched Flexure (ENF) tests in order to obtain mode-I and mode-II interlaminar fracture toughness. The measured fracture toughnesses are compared to that of CFRP laminates without CSCNT to evaluate the effectiveness of CSCNT dispersion for the improvement of fracture toughness. All CSCNT-dispersed CFRP laminates exhibit higher fracture toughness, and specifically, CSCNT-dispersed CFRP laminates with thin epoxy interlayers containing short CSCNTs have three times higher fracture toughness than CFRP laminates without CSCNT. SEM observation of fracture surfaces is also conducted to investigate the mechanisms of fracture toughness improvement. Crack deflection mechanism is recognized in the CSCNT-dispersed CFRP laminates, which is considered to contribute the enhancement of interlaminar fracture toughness. |
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| Keywords: | A. Polymer-matrix composites (PMCs) A. Carbon nanotubes A. Laminate B. Fracture toughness |
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