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Observation and mechanics of 3D + fatigue failure precursor phenomenon of CFRP interface region with ultra-high precision X-ray microscope

Research Project

Project/Area Number 20H02028
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 18010:Mechanics of materials and materials-related
Research InstitutionKyoto University

Principal Investigator

Hojo Masaki  京都大学, 工学研究科, 名誉教授 (70252492)

Co-Investigator(Kenkyū-buntansha) 木村 正雄  大学共同利用機関法人高エネルギー加速器研究機構, 物質構造科学研究所, 教授 (00373746)
西川 雅章  京都大学, 工学研究科, 准教授 (60512085)
松田 直樹  福井大学, 学術研究院工学系部門, 准教授 (90756818)
大島 草太  東京都立大学, システムデザイン研究科, 助教 (90885112)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2022: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2021: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
Fiscal Year 2020: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
KeywordsCFRP / 破壊力学特性 / メゾスケール / X線CT顕微鏡(CT) / イメージベイスドモデル / X線顕微鏡(CT) / X線CT顕微鏡(CT) / X線顕微鏡(CT)
Outline of Research at the Start

本課題では,メゾレベルおよびナノレベルでの空間分解能を有するX線顕微鏡(CT)によりき裂先端損傷領域での静的および疲労破壊の前駆現象を3次元かつ時間経過とともに観察する.3次元画像に基づくモデル解析を併用することにより,マクロな破壊の前駆現象である損傷領域の微視的な損傷の発生と進展の力学原理を解明する.これにより,より高性能な複合材料及び構造開発のための微視的観点からの材料開発指針を得る.

Outline of Final Research Achievements

In order to elucidate the microscopic factors controlling the fracture mechanics properties (fracture toughness and crack growth characteristics) of CFRP (Carbon Fiber Reinforced Plastics), we observed the crack-tip region of CFRP under Mode-I and Mode-I/II mixed loadings based on in-situ nanoscopic synchrotron radiation X-ray computed tomography. We revealed the precursor phenomena of failure initiation at interface region for CFRP and three-dimensional mechanism of fracture, using mechanical models.

Academic Significance and Societal Importance of the Research Achievements

X線顕微鏡(CT)によりCFRPのモードI負荷および混合モード下におけるき裂先端損傷領域での損傷を詳細に観察する実験法を確立した.観察結果を基に,3次元画像に基づくモデル解析を検討し,有限要素法に基づく数値解析を用いて,繊維間距離や最大主応力,静水圧応力,応力三軸度の関係について評価するモデルを構築した.これにより,CFRPのき裂先端領域において,界面はく離が先行し,樹脂破壊が遅れて発生する力学原理が明らかとなり,学術的に新規性の高い知見を得ることができた.CFRPを用いた材料・構造設計において,メゾスケールからのCFRP破壊力学特性の設計につながる実用的な成果が得られた.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (10 results)

All 2023 2022 2021 Other

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (7 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results) Remarks (1 results)

  • [Journal Article] Nano- to Macroscale In Situ Observation of Microcrack Formation in Carbon Fiber-Reinforced Plastic under Loading Using Synchrotron Transmission X-ray Microscopy2023

    • Author(s)
      Masao Kimura, Toshiki Watanabe, Sota Oshima, Yasuo Takeichi,Yoshihiro Niwa, Rumi Kitazawa, Tomohiro Ishii, Yuji Seryo, Masaki Hojo
    • Journal Title

      AIP Conf. Seri

      Volume: 230 Pages: 109332-109332

    • DOI

      10.1016/j.compscitech.2022.109332

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] High-resolution in situ characterization of micromechanisms in CFRP laminates under mode II loading2022

    • Author(s)
      Sota Oshima, Aya Mamishin, Masaki Hojo, Masaaki Nishikawa, Naoki Matsuda, Manato Kanesaki
    • Journal Title

      Engineering Fracture Mechanics

      Volume: 260 Pages: 108189-108189

    • DOI

      10.1016/j.engfracmech.2021.108189

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] CFRPの圧縮特性評価に対するDGD法を用いた損傷モデルの適用2022

    • Author(s)
      高塚尚輝
    • Organizer
      第60回飛行機シンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] Experimental investigations and finite element analysis on bearing strength of high performance Thin-Ply fibre metal laminates2022

    • Author(s)
      B. Koetter, K. Yamada, J. Koerbelin, K. Kawabe, M. Nishikawa, M. Hojo and B. Fiedler
    • Organizer
      The 2022 Asia-Pacific International Symposium on Aerospace Technology (APISAT 2022)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Why Mode I fatigue delamination under different stress ratio is controlled by Kmax2021

    • Author(s)
      M. Hojo, K. Miyaki, S. Oshima, N. Matsuda, M. Nishikawa
    • Organizer
      The 8th International Conference on Fatigue of Composites
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Microscopic triaxial stress state analysis to explain damages around crack tip in CFRP observed with 50 nm-resolution X-CT2021

    • Author(s)
      Yuji Seryo, Sota Oshima, Kosuke Miyaki, Masao Kimura, Toshiki Watanabe, Masaki Hojo, Masaaki Nishikawa, Naoki Matsuda
    • Organizer
      1st Virtual ESIS TC4 Conference on Fracture of Polymers, Composites and Adhesives
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] CFRPのモードI層間はく離疲労き裂伝ぱの応力比依存性がKmaxに支配されるメカニズム2021

    • Author(s)
      北條正樹,宮木孝輔,大島草太,松田直樹,西川雅章
    • Organizer
      第20回破壊力学シンポジウム
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] CFRPのモードII破壊じん性試験におけるき裂進展開始前のコンプライアンス非線形性の検討2021

    • Author(s)
      福田竜士,宮木孝輔,北條正樹,西川雅章,松田直樹
    • Organizer
      第12回日本複合材料会議(JCCM-12)
    • Related Report
      2020 Annual Research Report
  • [Presentation] CFRPの微視的構造がき裂先端近傍の三軸応力状態に及ぼす影響2021

    • Author(s)
      瀬領勇司,大島草太,宮木孝輔,木村正雄,渡邊稔樹,北條正樹,西川雅章,松田直樹
    • Organizer
      第12回日本複合材料会議(JCCM-12)
    • Related Report
      2020 Annual Research Report
  • [Remarks] 研究室ホームページ

    • URL

      https://ams.me.kyoto-u.ac.jp

    • Related Report
      2022 Annual Research Report 2021 Annual Research Report 2020 Annual Research Report

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Published: 2020-04-28   Modified: 2024-01-30  

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