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Damage evaluation and lifetime prediction of CFRP composites initiated from microdefects

Research Project

Project/Area Number 21K14047
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 18010:Mechanics of materials and materials-related
Research InstitutionTokyo Metropolitan University

Principal Investigator

Oshima Sota  東京都立大学, システムデザイン研究科, 助教 (90885112)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords複合材料 / 欠陥 / 亀裂 / 破壊力学 / 疲労破壊 / 有限要素解析 / 炭素繊維強化複合材料 / 微視的損傷 / その場観察 / 破壊メカニズム / 破壊メカニズム 3.研究課題名 / 炭素繊維複合材料 / トランスバースクラック
Outline of Research at the Start

炭素繊維複合材料の積層板における最も初期の破壊モードであるトランスバースクラックは、微視的欠陥を起点に生じることが多く、発生箇所の予測が難しい。このため、その発生・進展プロセスの実験的評価は困難とされてきた。本研究では、超微細な人工欠陥を炭素繊維複合材料中に導入し、その場観察を行うことで、繰返し荷重下におけるトランスバースクラックの発生・進展のメカニズムを実験的に解明する。さらに、有限要素法を用いた微視的損傷進展解析を行うことで、トランスバースクラック発生・進展の予測手法を確立する。これにより、積層板の疲労寿命を正確に予測できるようになり、複合材料構造の信頼性向上に貢献する。

Outline of Final Research Achievements

Carbon fiber composite polymers (CFRPs) are widely used in the aerospace industry because of their strength and weight. The presence of defects is inevitable during the manufacturing process of CFRPs. In this study, the damage progression behavior was evaluated initiated from defects. Artificial defects with different sizes were introduced in CFRPs. The minimum size of the artificial defects was as small as 2.5 μm. Cracks initiation and propagation from the defects were observed using a high-magnification optical microscope. A trigger system synchronized with the testing machine was developed to capture crack growth behavior under cyclic (fatigue) loading. In addition, the stress distribution around the defects was visualized using a numerical approach.

Academic Significance and Societal Importance of the Research Achievements

炭素繊維複合材料中の欠陥は寸法や位置、分布を制御できないため従来は欠陥を起点とする亀裂進展挙動を定量的に評価することは困難とされてきた。本研究では位置と大きさが制御された欠陥をひとつだけ材料中に導入できるため、欠陥の影響を定量的に評価することが可能となった。これにより、これまでは「材料のばらつき」として取り扱われてきた積層板の寿命をより正確に予測できるようになることが期待される。これは航空宇宙分野をはじめとした複合材料の信頼性が求められる分野で重要な知見である。

Report

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

    (20 results)

All 2024 2023 2022 2021

All Journal Article (6 results) (of which Peer Reviewed: 6 results,  Open Access: 1 results) Presentation (14 results) (of which Int'l Joint Research: 2 results,  Invited: 3 results)

  • [Journal Article] DIC法を用いた亀裂検出システムの開発とCFRP積層板における疲労亀裂進展評価2024

    • Author(s)
      大島草太、日下貴之、野村泰稔
    • Journal Title

      日本複合材料学会誌

      Volume: 50 Pages: 55-61

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Experimental characterization of cracking behavior initiating from microdefects in cross-ply CFRP laminates2023

    • Author(s)
      Oshima Sota、Higuchi Ryo、Kobayashi Satoshi
    • Journal Title

      Engineering Fracture Mechanics

      Volume: 281 Pages: 109116-109116

    • DOI

      10.1016/j.engfracmech.2023.109116

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Cooling rate-dependent mechanical properties of polyphenylene sulfide (PPS) and carbon fiber reinforced PPS (CF/PPS)2023

    • Author(s)
      Oshima Sota、Higuchi Ryo、Kato Masaya、Minakuchi Shu、Yokozeki Tomohiro、Aoki Takahira
    • Journal Title

      Composites Part A: Applied Science and Manufacturing

      Volume: 164 Pages: 107250-107250

    • DOI

      10.1016/j.compositesa.2022.107250

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Experimental data for cooling rate-dependent properties of Polyphenylene Sulfide (PPS) and Carbon Fiber Reinforced PPS (CF/PPS)2023

    • Author(s)
      Oshima Sota、Higuchi Ryo、Kato Masaya、Minakuchi Shu、Yokozeki Tomohiro、Aoki Takahira
    • Journal Title

      Data in Brief

      Volume: 46 Pages: 108817-108817

    • DOI

      10.1016/j.dib.2022.108817

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] In situ optical observation of damage and failure process in adhesively bonded CFRP joints under mixed-mode loading2023

    • Author(s)
      Oshima Sota、Mikami Tomoisa、Yoshimura Akinori、Hirano Yoshiyasu、Ogasawara Toshio
    • Journal Title

      Composite Structures

      Volume: 305 Pages: 116453-116453

    • DOI

      10.1016/j.compstruct.2022.116453

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [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 Research-status Report
    • Peer Reviewed
  • [Presentation] Experimental characterization of R curve during transverse crack growth in unidirectional CFRP laminates using size-effect law2024

    • Author(s)
      Sota Oshima, Keishiro Fukayama, Tousei Noma, Haruki Hirai, Chong Gao, Takayuki Kusaka
    • Organizer
      48th International Conference and Expo on Advanced Ceramics and Composites (ICACC2024) 2024年1月22日
    • Related Report
      2023 Annual Research Report
  • [Presentation] Micromechanisms of defect induced cracking in cross-ply CFRP laminates2024

    • Author(s)
      Sota Oshima, Ryo Higuchi, Satoshi Kobayashi
    • Organizer
      48th International Conference and Expo on Advanced Ceramics and Composites (ICACC2024)
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] CFRPの層内樹脂割れに対する亀裂進展抵抗の評価2023

    • Author(s)
      大島草太
    • Organizer
      第24回高分子基複合材料の成形加工に関する研究会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Cracking behavior in cross-ply CFRP laminates initiating from microdefects under monotonic and cyclic loading2023

    • Author(s)
      Sota Oshima, Ryo Higuchi, Satoshi Kobayashi
    • Organizer
      2023 US-Japan Joint Symposium for Composite Materials
    • Related Report
      2023 Annual Research Report
  • [Presentation] Experimental characterization of fatigue crack growth in cross-ply CFRP laminates initiating from microdefects2023

    • Author(s)
      Sota Oshima, Ryo Higuchi, Satoshi Kobayashi
    • Organizer
      9th International Conference on Fatigue of Composites (ICFC9)
    • Related Report
      2023 Annual Research Report
  • [Presentation] CFRP直交積層板における欠陥を起点としたトランスバースクラックの進展挙動評価2023

    • Author(s)
      大島草太, 樋口諒, 小林訓史
    • Organizer
      第14回日本複合材料会議
    • Related Report
      2022 Research-status Report
  • [Presentation] Crack growth behavior in CFRP laminates under mode II loading characterized by high-resolution microscopy2023

    • Author(s)
      Sota Oshima
    • Organizer
      JSPS-DST, Japan-India Workshop 2023, Innovative Carbon Fiber Polymer Composite Structures: Material, Design and Application
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] CFRP積層板における欠陥を起点としたトランスバースクラックの損傷進展過程2022

    • Author(s)
      大島草太, 樋口諒, 小林訓史
    • Organizer
      日本界面学会2022年度年次大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Experimental and numerical evaluation of cracking behavior in cross-ply CFRP laminates initiated from micro defect2022

    • Author(s)
      Sota Oshima, Ryo Higuchi, Satoshi Kobayashi
    • Organizer
      International Conference on Materials & Processing 2022 (ICM&P2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] CFRP直交積層板におけるトランスバースクラックの発生・進展に及ぼす欠陥寸法の影響2022

    • Author(s)
      大島草太、樋口諒、小林訓史
    • Organizer
      第64回構造強度に関する講演会
    • Related Report
      2022 Research-status Report
  • [Presentation] ミクロスケールの欠陥を起点とするトランスバースクラックの進展挙動評価2021

    • Author(s)
      大島草太、樋口諒
    • Organizer
      第46回複合材料シンポジウム
    • Related Report
      2021 Research-status Report
  • [Presentation] 微視的欠陥がトランスバースクラックの発生・進展に及ぼす影響の実験的評価2021

    • Author(s)
      大島草太
    • Organizer
      2021年度JCOM若手ウェビナー
    • Related Report
      2021 Research-status Report
  • [Presentation] CFRP構造のき裂進展挙動に及ぼす微視的損傷の影響2021

    • Author(s)
      大島草太
    • Organizer
      日本材料学会第174回破壊力学部門委員会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Deformation Behavior of Neat Epoxy Resin under Loading and Unloading Conditions2021

    • Author(s)
      Sota Oshima, Masaki Hojo, Kohei Yamada, Toshio Ogasawara
    • Organizer
      8th International Conference on Fatigue of Composites (ICFC8)
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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