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Development of life-time monitoring technology of CFRP structures using Rayleigh scattering-based distributed sensors

Research Project

Project/Area Number 20K04182
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 18010:Mechanics of materials and materials-related
Research InstitutionKochi University of Technology

Principal Investigator

Kosaka Tatsuro  高知工科大学, システム工学群, 教授 (80315978)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsComposite materials / Resin flow / Delamination / Optical fiber sensor / Strain measurement / Process monitoring / Structural monitoring / Rayleigh scattering / 損傷モニタリング / 複合材料 / FRP / 層間剥離 / 光ファイバセンサ / レイリー散乱型分布センサ / ひずみ分布測定 / 温度分布測定 / 成形モニタリング / 非破壊検査 / レイリー散乱 / 屈折率測定 / 樹脂流動 / 損傷同定 / プロセスモニタリング
Outline of Research at the Start

本研究では,1本で広範囲測定が可能なレイリー散乱型光ファイバ分布センサを用いて,製造時には樹脂流動と成形ひずみと初期欠陥を,運用時には多重剥離損傷の発生・進展をリアルタイムで同定する手法を確立することを目的とする.センサは製造時にプリフォームに埋め込まれ,製造後にもそのまま用いる.樹脂流動で生じるプリフォームのひずみ分布からフローフロント位置を同定し,加熱成形時には硬化収縮および熱ひずみの分布を測定して初期欠陥の同定を行う.さらに運用中に荷重を受けた場合に生じるひずみ場の乱れと,理論解析によって得られているひずみの乱れ場と剥離損傷形態の関係から,剥離の発生・進展・形状の同定を可能にする.

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.

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.

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (14 results)

All 2023 2021

All Presentation (14 results) (of which Int'l Joint Research: 8 results,  Invited: 1 results)

  • [Presentation] Monitoring of Delamination of FRP by Rayleigh Scattering-Based Sensors2023

    • Author(s)
      Tatsuro Kosaka
    • Organizer
      The International Conference on Leading Edge Manufacturing/Materials&Processing (LEM&P 2023)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] GROWTH MONITORING OF MODE II DELAMINATION BY RAYLEIGH SCATTERING-BASED SENSORS2023

    • Author(s)
      Tatsuro Kosaka
    • Organizer
      12th Asian-Australasian Conference on Composite Materials (ACCM12)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Delamination Detection of CFRP Laminates by Rayleigh Scattering-Based Sensor2023

    • Author(s)
      Seira Nakajima
    • Organizer
      The 2nd Japan-China-Korea Joint Symposium on Composite Materials Symposium
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] レイリー散乱型センサを用いた表面ひずみ分布測定による CFRP 積層板の剥離検出2023

    • Author(s)
      中島 星良
    • Organizer
      日本機械学会 中国四国支部 第62 期総会・講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] レイリー散乱型分布センサを用いた温度分布測定による CFRP 積層板の損傷検出2023

    • Author(s)
      田尻 史弥
    • Organizer
      日本機械学会 中国四国支部 第62 期総会・講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] レイリー散乱型分布センサによる剥 離進展モニタリング2023

    • Author(s)
      高坂達郎
    • Organizer
      JCCM-12 (第12回日本複合材料会議)
    • Related Report
      2022 Research-status Report
  • [Presentation] レイリー散乱型センサによる FRP の 2 次元剥離検出2023

    • Author(s)
      中島 星良
    • Organizer
      機械学会中四国支部 第 53 回学生員卒業研究発表講演会
    • Related Report
      2022 Research-status Report
  • [Presentation] Monitoring of Delamination of FRP by Rayleigh Scattering-Based Sensors2023

    • Author(s)
      Tatsuro Kosaka
    • Organizer
      Leading Edge Manufacturing/Material and Processing (LEM&P2023)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Monitoring of Impregnation Process of VARTM by Rayleigh Scattering Optical Fiber Sensors2021

    • Author(s)
      Tatsuro Kosaka
    • Organizer
      17th Japan International SAMPE symposium and exhibition (JISSE-17)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] レイリー散乱型分布センサのCFRP積層板き裂進展モニタリングへの適用2021

    • Author(s)
      高坂達郎
    • Organizer
      日本機械学会第29回機械材料・材料加工技術講演会(M&P2021)
    • Related Report
      2021 Research-status Report
  • [Presentation] レイリー散乱型分布センサを用いたCFRP積層板の モードⅡ損傷モニタリング2021

    • Author(s)
      大西 一輝
    • Organizer
      第46回複合材料シンポジウム
    • Related Report
      2021 Research-status Report
  • [Presentation] Growth Monitoring of Delamination and Adhesive Debonding of CFRP Structures by Rayleigh Scatting-Based Distribution Sensors2021

    • Author(s)
      Kazuki Ohnishi
    • Organizer
      American society for composites, 36th technical conference
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Monitoring of impregnation process of VaRTM by Rayleigh scattering optical fiber sensors2021

    • Author(s)
      Tatsuro Kosaka
    • Organizer
      American Society for Composites 36th Technical Conference, College Station, TX September 19 - 21, 2021
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Growth monitoring of delamination and adhesive debonding of CFRP structures by Rayleigh scatting-based distribution sensors2021

    • Author(s)
      Kazuki Onishi
    • Organizer
      American Society for Composites 36th Technical Conference, College Station, TX September 19 - 21, 2021
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research

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Published: 2020-04-28   Modified: 2025-01-30  

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