Multipoint cure monitoring of CFRP laminates using a flexible matrix sensor |
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| Authors: | Seiji Kobayashi Ryosuke Matsuzaki Akira Todoroki |
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| Affiliation: | 1. Graduate student, Tokyo Institute of Technology, 2-12-1-I1-58, O-okayama Meguro-ku, Tokyo 152-8552, Japan;2. Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, 2-12-1-I1-66, O-okayama Meguro-ku, Tokyo 152-8552, Japan;3. Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, 2-12-1-I1-58, O-okayama Meguro-ku, Tokyo 152-8552, Japan;1. Department of Civil Engineering, Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212013, China;2. Department of Civil and Environmental Engineering, University of Wisconsin–Madison, Madison, WI 53706, USA;1. Airbus APWorks GmbH, Willy-Messerschmitt-Str. 1, 82024 Taufkirchen, Germany;2. Airbus Group Innovations, Composites Technologies, 81366 Munich, Germany;3. Institute for Carbon Composites, Technische Universität München, 85748 Garching, Germany;1. Department of Mechanical Engineering, University of Chester, Chester, CH2 4NU, UK;2. State Key Laboratory for Manufacturing Systems Engineering, Xian Jiaotong University, 28 West Xianning Road, Xian, 710049, China;3. Key Laboratory of Electronic Equipment Structure Design, Ministry of Education, Xidian University, Xi''an, 710071, China |
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| Abstract: | Since a carbon fiber reinforced plastic (CFRP) structure is complicated in the adoption of integral molding, local molding faults such as under curing and dry spots are liable to occur. To solve this problem, the distribution of the degree of curing for the entire composite structure must be measured. In the present study, we propose a patch-type flexible matrix sensor based on permittivity measurements. Multiple electrodes and wirings are readily fabricated simultaneously using a photolithographic process. Moreover, the sensor has only m + n wirings for m × n sensors, and is thereby suitable for multipoint cure monitoring. We also constructed a method for estimating the degree of curing considering the effect of frequency dependence of the permittivity of resin and viscosity variation due to temperature change. Experiments of multipoint cure monitoring are carried out using a CFRP plate and an actual aircraft structure. As a result, we confirmed the effectiveness of this method by comparing with results using a conventional differential scanning calorimeter. |
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