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Development of Fatigue Simulation Method Considering the Microscopic Damage Mechanisms in CFRP and Prediction of Fatigue Life

Research Project

Project/Area Number 22K20400
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Aoki Ryoma  東京大学, 大学院工学系研究科(工学部), 助教 (60967868)

Project Period (FY) 2022-08-31 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords炭素繊維強化複合材料 / 疲労負荷 / 微視的損傷進展 / 有限要素解析 / 残留強度評価 / 炭素繊維複合材料 / 疲労損傷進展 / 微視的損傷 / 疲労寿命
Outline of Research at the Start

本研究では,CFRP(炭素繊維強化プラスチック)の長期使用時の健全性評価に向けて,繰り返し負荷(疲労負荷)によって生じる微視的損傷を考慮した疲労損傷進展解析モデルを確立することを目指す.本手法により,CFRP積層板の層内の巨視的なき裂が形成されるまでにどれだけ微視的損傷が発生・進展するかを定量的に評価し,微視的損傷の累積メカニズムを明らかにする.さらには,微視的損傷がCFRP積層板の残留剛性・強度に与える影響を評価し,疲労寿命の予測に繋げる.

Outline of Final Research Achievements

This study aimed to evaluate the integrity of carbon fiber reinforced plastics (CFRP) during long-term operation by developing a fatigue damage model that considers microscopic damage. The cumulative mechanism of microscopic damage due to fatigue loading was clarified through numerical analysis, enabling the quantitative evaluation of microscopic damage up to the formation of cracks. Additionally, the analysis was extended to handle combined fatigue conditions with two different load levels. Furthermore, a method to predict the residual strength after fatigue was established as the durability evaluation. By comparing the predicted residual strength data with experimental data from several types of CFRP laminates, the accuracy of the predictions was validated, demonstrating the utility of the method in predicting the residual strength after fatigue.

Academic Significance and Societal Importance of the Research Achievements

CFRPの微視的損傷を考慮した疲労解析手法を開発し、巨視的なき裂形成に至るまでの損傷累積メカニズムを明らかにし、その損傷を定量的に評価することが可能となった。さらに、耐久性評価にとって重要な疲労後の残留強度を予測することも可能となった。これにより本手法は、航空機などの航空宇宙構造物だけでなく、近年注目を集める高圧水素タンクなどに対しても、耐久性評価を含めた設計支援技術として期待できる。

Report

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

    (9 results)

All 2024 2023

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (8 results) (of which Int'l Joint Research: 6 results,  Invited: 1 results)

  • [Journal Article] Progressive damage and residual strength of open-hole thin-ply CFRP laminates under tensile fatigue loading2023

    • Author(s)
      Aoki Ryoma、Higuchi Ryo、Yokozeki Tomohiro
    • Journal Title

      Composite Structures

      Volume: 314 Pages: 116973-116973

    • DOI

      10.1016/j.compstruct.2023.116973

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] Numerical prediction of fatigue damage progress and residual strength after fatigue in composite pressure vessel2024

    • Author(s)
      Ryoma Aoki, Tomohiro Yokozeki, Tetsuya Matsuda, Masahito Ueda, Wataru Iwase
    • Organizer
      21th European Conference on Composite Materials
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Material characterization on temperature dependency of fatigue stiffness degradation of CFRP laminate manufactured by filament winding using three-point bending test2024

    • Author(s)
      Takeshi Watanabe, Ryoma Aoki, Tomohiro Yokozeki, Yuta Urushiyama
    • Organizer
      21th European Conference on Composite Materials
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Evaluation on fatigue degradation and residual strength of composite pressure vessel2024

    • Author(s)
      Ryoma Aoki, Tomohiro Yokozeki, Tetsuya Matsuda, Masahito Ueda, Wataru Iwase
    • Organizer
      American Society for Composites 39th Annual Technical Conference
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Evaluation of fatigue degradation of laminate stiffness using intra-laminar damage model considering the effects of ply thickness2023

    • Author(s)
      Ryoma Aoki, Ryo Higuchi, Tomohiro Yokozeki, Takahira Aoki
    • Organizer
      9th International Conference on Fatigue of Composites
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Simulation of Residual Property after Fatigue in CFRP Laminates Manufactured by Filament Winding Using Intra-laminar Damage Models2023

    • Author(s)
      Takeshi Watanabe, Ryoma Aoki, Tomohiro Yokozeki, Yuta Urushiyama
    • Organizer
      9th International Conference on Fatigue of Composites
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Prediction of filled-hole tensile strength of CFRP laminates with various ply thicknesses2023

    • Author(s)
      Ryoma Aoki, Ryo Higuchi, Tomohiro Yokozeki, Kazuyuki Aoki, Shigekazu Uchiyama, Toshio Ogasawara
    • Organizer
      44th International Conference and Exposition on Advanced Ceramics and Composites
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] CFRP積層板の板厚・積層比率が有孔引張強度・破壊特性に与える影響2023

    • Author(s)
      青木涼馬,樋口諒,横関智弘,青木一行,内山重和,小笠原俊夫
    • Organizer
      第14回日本複合材料会議
    • Related Report
      2022 Research-status Report
  • [Presentation] FW製CFRP積層試験片の三点曲げ疲労損傷後の引張物性評価2023

    • Author(s)
      渡邉健,青木涼馬,横関智弘, 漆山雄太
    • Organizer
      第14回日本複合材料会議
    • Related Report
      2022 Research-status Report

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Published: 2022-09-01   Modified: 2025-01-30  

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