2023 Fiscal Year Final Research Report
Development of life-time monitoring technology of CFRP structures using Rayleigh scattering-based distributed sensors
| Project/Area Number |
20K04182
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 18010:Mechanics of materials and materials-related
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| Research Institution | Kochi University of Technology |
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Principal Investigator |
Kosaka Tatsuro 高知工科大学, システム工学群, 教授 (80315978)
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | Composite materials / Resin flow / Delamination / Optical fiber sensor / Strain measurement / Process monitoring / Structural monitoring / Rayleigh scattering |
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| Outline of Final Research Achievements |
Recently, real-time monitoring methods for the molding condition and internal damage of FRP structures have been proposed to improve efficiency and safety. This study aims to establish a method to detect resin flow in RTM molding and FRP delamination using a Rayleigh scattering optical fiber distribution sensor. Experimental and analytical results showed that the flow-front position of resin flow in RTM molding can be measured using the sensor embedded into preform and arranged on a grid. In addition, we focused on Mode I delamination (DCB test), Mode II delamination (ENF test), and adhesive delamination (SLJ test). From the experimental and FEM analytical results, it was found that all types of delamination could be detected with 1mm special resolution from the surface strain distribution measurement results. It was also found that internal delamination can be detected by measuring the temperature of the back surface during heating.
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| Free Research Field |
Composite materials
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| Academic Significance and Societal Importance of the Research Achievements |
レイリー散乱型光ファイバ分布センサを用いた樹脂流動は世界に例が無く，またひずみ分布測定による剥離検出の例も多くない．よって本研究はオリジナリティが高く，また検出の仕組みを明らかにすることには学術的な価値が高い．これらの成果は，FRP製造における歩留まりを改善し，また開発コストを低下させる．さらに運用時のFRP構造のリアルタイム剥離検出は，航空機の安全性を高め，また定期検査のコストを軽減することから，航空機業界では重要な命題である．本研究成果を応用すれば1本のセンサで小型航空機構造全体のモニタリングが可能であり，特に近年話題の空飛ぶクルマの安全性確保において重要な意義があると考えている．
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