In situ process monitoring of hierarchical micro-/nano-composites using percolated carbon nanotube networks |
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| Affiliation: | 1. Department of Mechanical Engineering, Inha University, Inha-ro 100, Nam-gu, Incheon 402-751, Republic of Korea;2. Department of Mechanical Engineering, Ulsan National Institute of Science and Technology, UNIST-gil 50, Eonyang-eup, Ulju-gun, Ulsan 689-798, Republic of Korea;1. Department of Mechanical Engineering, Ulsan National Institute of Science and Technology, UNIST-gil 50, Eonyang-eup, Ulju-gun, Ulsan 689-798, Republic of Korea;2. Department of Mechanical Design Engineering, Youngsan University, 288 Junam-ro, Yangsan-si, Kyungnam-do 626-790, Republic of Korea;1. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China;2. Department of Aeronautical and Aviation Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China;3. School of System Design and Intelligent Manufacturing, Southern University of Science and Technology, Shenzhen, 518055, PR China;4. The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, 518057, PR China;5. School of Astronautics, Northwestern Polytechnical University, Xi''an, 710072, PR China;1. Institute for Microsensors, Actuators and Systems (IMSAS), Otto- Hahn- Allee, NW1, 28359 Bremen, Germany;2. Faserinstitut Bremen e.V., IW3, Am Biologischen Garten 2, 28359 Bremen, Germany;3. Fraunhofer ICT, Branch Functional Lightweight Design (FIL), Am Technologiezentrum 2, 86159 Augsburg, Germany;1. School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, China;2. School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai, China;3. Shanghai Institute of Special Equipment Inspection and Technical Research, Shanghai, China |
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| Abstract: | We report a method to monitor the manufacturing process of hierarchical micro-/nano-composites that uses integrated and percolated multi-walled carbon nanotube (MWCNT) networks with the aim of reducing part-to-part variability. Composites were fabricated by VARTM. Fiber textiles were spray-coated with MWCNTs, electrodes were embedded prior to vacuum bagging. In situ process monitoring was achieved by measurement of the electrical resistance of electrode pairs. The effects of MWCNT density and length on the ability to monitor the manufacturing process were evaluated. Experiments showed that monitoring the changes in resistance between electrode pairs on the conductive MWCNT network allowed various events during the manufacturing process, including part infusion, onset of crosslinking, and gel point of the resin, which are necessary for accurate evaluation of part quality. Our simple yet effective method to monitor the manufacturing processes and predict the final-part quality of multiscale composites can be integrated into existing processes with minimal modifications. |
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| Keywords: | A. Nano-structures D. Process monitoring E. Cure E. Resin flow |
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