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Predictions of remaining lifetime and residual strength of CFRP under cyclic loading based on entropy damage criterion

Research Project

Project/Area Number 21KK0063
Research Category

Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 18:Mechanics of materials, production engineering, design engineering, and related fields
Research InstitutionTokyo University of Science

Principal Investigator

Koyanagi Jun  東京理科大学, 先進工学部マテリアル創成工学科, 教授 (60386604)

Co-Investigator(Kenkyū-buntansha) 樋口 諒  東京大学, 大学院工学系研究科(工学部), 特任准教授 (00815946)
佐藤 光桜  国立研究開発法人宇宙航空研究開発機構, 航空技術部門, 研究開発員 (90914664)
Project Period (FY) 2021-10-07 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥18,980,000 (Direct Cost: ¥14,600,000、Indirect Cost: ¥4,380,000)
Fiscal Year 2023: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000)
Fiscal Year 2022: ¥7,540,000 (Direct Cost: ¥5,800,000、Indirect Cost: ¥1,740,000)
Fiscal Year 2021: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
KeywordsCFRP / 疲労 / エントロピー / 数値シミュレーション / 繰り返し負荷 / 強度低下 / 有限要素解析 / 強度劣化
Outline of Research at the Start

東京理科大-東大-JAXAとシンガポール国立大学(NUS)の国際共同研究として繰り返し負荷下におけるCFRPの正確な余寿命・残存強度の定量化に取り組む.従来の実験式・経験則に基づいた耐久性研究の範囲から逸脱すべく,エントロピー損傷に基づいた根拠あるCFRPの劣化モデルを構築する.高分子材料の見えない劣化を分子の動きから計量されるエントロピー値で定量化し,マクロな寿命予測へ接続する.このような画期的な研究アイデアを日本側は有するものの,この実装にはシンガポール国立大学が有する計算力学に関するノウハウが必須である.

Outline of Final Research Achievements

This study developed the world's first model for simulating the fatigue characteristics and strength degradation behavior of carbon fiber reinforced plastics (CFRP) based on entropy. The model incorporates an entropy-based strength degradation scheme, allowing for the simulation of strength reduction and delayed failure without an increase in strain. Using this model, the fatigue failure of CFRP was simulated, and numerical analyses were conducted considering the effects of different stress ratios and frequencies. The results obtained are consistent with experimental findings, providing a new approach for numerically predicting the long-term durability of CFRP. This research enhances the design efficiency of CFRP structures and contributes to the Sustainable Development Goals (SDGs).

Academic Significance and Societal Importance of the Research Achievements

本研究は、炭素繊維強化プラスチック(CFRP)の長期耐久性をエントロピーに基づいて数値的に予測する新しいアプローチを提供する。従来の実験的手法に代わり、信頼性の高い数値モデルを用いることで、CFRP構造物の設計と評価の効率が大幅に向上する。このモデルは、疲労特性や強度低下挙動の詳細なシミュレーションを可能にし、異なる応力条件や環境下でのCFRPの挙動を予測するツールとして有用である。また、この研究は持続可能な開発目標(SDGs)に貢献し、材料の使用寿命を延ばし、資源の効率的な利用を促進することで、環境負荷の低減にも寄与する。

Report

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

    (13 results)

All 2024 2023 2022 Other

All Int'l Joint Research (2 results) Journal Article (9 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 9 results,  Open Access: 9 results) Presentation (2 results) (of which Int'l Joint Research: 1 results)

  • [Int'l Joint Research] National University of Singapore(シンガポール)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] National University of Singapore(シンガポール)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Identification of Internal Damage in CFRP Cross-Ply Laminates Subjected to Cyclic Loadings by Thermal Measurement2024

    • Author(s)
      Koyanagi Jun、Yoshida Honoka、Morita Mayu、Isozaki Minori
    • Journal Title

      Procedia Structural Integrity

      Volume: 52 Pages: 187-194

    • DOI

      10.1016/j.prostr.2023.12.019

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Identification of invisible fatigue damage of thermosetting epoxy resin by non-destructive thermal measurement using entropy generation2023

    • Author(s)
      Kudo Natsuko、Fujita Ryohei、Oya Yutaka、Sakai Takenobu、Nagano Hosei、Koyanagi Jun
    • Journal Title

      Advanced Composite Materials

      Volume: 33 Issue: 2 Pages: 233-249

    • DOI

      10.1080/09243046.2023.2230687

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Durability Analysis of CFRP Adhesive Joints: A Study Based on Entropy Damage Modeling Using FEM2023

    • Author(s)
      Li Yutong、Deng Huachao、Takamura Maruri、Koyanagi Jun
    • Journal Title

      Materials

      Volume: 16 Issue: 20 Pages: 6821-6821

    • DOI

      10.3390/ma16206821

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Micro-Scale Numerical Simulation of Fatigue Failure for CFRP Subjected to Multiple-Amplitude Cyclic Loadings Based on Entropy Damage Criterion2023

    • Author(s)
      Deng Huachao、Toda Keitaro、Sato Mio、Koyanagi Jun
    • Journal Title

      Materials

      Volume: 16 Issue: 18 Pages: 6120-6120

    • DOI

      10.3390/ma16186120

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Numerical simulation for the tensile failure of randomly oriented short fiber reinforced plastics based on a viscoelastic entropy damage criterion2023

    • Author(s)
      Kagawa Hikaru、Umezu Yuta、Sakaue Kenichi、Koyanagi Jun
    • Journal Title

      Composites Part C: Open Access

      Volume: 10 Pages: 100342-100342

    • DOI

      10.1016/j.jcomc.2022.100342

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] A Molecular Dynamics Simulation for Thermal Activation Process in Covalent Bond Dissociation of a Crosslinked Thermosetting Polymer2023

    • Author(s)
      Yamada Naoki、Oya Yutaka、Kato Nobuhiko、Mori Kazuki、Koyanagi Jun
    • Journal Title

      Molecules

      Volume: 28 Issue: 6 Pages: 2736-2736

    • DOI

      10.3390/molecules28062736

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Numerical and Experimental Studies for Fatigue Damage Accumulation of CFRP Cross-Ply Laminates Based on Entropy Failure Criterion2022

    • Author(s)
      Deng Huachao、Mochizuki Asa、Fikry Mohammad、Abe Shun、Ogihara Shinji、Koyanagi Jun
    • Journal Title

      Materials

      Volume: 16 Issue: 1 Pages: 388-388

    • DOI

      10.3390/ma16010388

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Finite element model for simulating entropy-based strength-degradation of carbon-fiber-reinforced plastics subjected to cyclic loadings2022

    • Author(s)
      Koyanagi Jun、Mochizuki Asa、Higuchi Ryo、Tan V.B.C.、Tay T.E.
    • Journal Title

      International Journal of Fatigue

      Volume: 165 Pages: 107204-107204

    • DOI

      10.1016/j.ijfatigue.2022.107204

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Evaluation of Microscopic Damage of PEEK Polymers under Cyclic Loadings Using Molecular Dynamics Simulations2022

    • Author(s)
      Iwamoto Shun、Oya Yutaka、Koyanagi Jun
    • Journal Title

      Polymers

      Volume: 14 Issue: 22 Pages: 4955-4955

    • DOI

      10.3390/polym14224955

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Numerical Simulation for Fatigue Damage Accumulation of CFRP cross-ply Laminates Based on Entropy-Damage Model2023

    • Author(s)
      Koyanagi Jun; Kudo Natsuko; Toda Keitaro; Yamada Naoki; Takamura Maruri
    • Organizer
      ICCS26 - 26th International Conference on Composite Structures & MECHCOMP8 - 8th International Conference on Mechanics of Composites
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 散逸エネルギーに基づく損傷を考慮したCFRPの疲労破壊モデルの構築2022

    • Author(s)
      望月 諒(東理大院),星名 滉(東理大),樋口 諒(東大),小柳 潤(東理大)
    • Organizer
      第13回日本複合材料会議(JCCM-13)
    • Related Report
      2021 Research-status Report

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Published: 2021-10-22   Modified: 2025-01-30  

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