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Development of evaluation method of joint strength for cruciform unidirectional composites

Research Project

Project/Area Number 21K03760
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 InstitutionKindai University

Principal Investigator

Noda Junji  近畿大学, 生物理工学部, 准教授 (00398992)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords十字型試験片 / モードI型はく離 / モードIII型はく離 / 結合力要素 / 繊維強化複合材料 / はく離挙動 / グリーンコンポジット / 界面はく離
Outline of Research at the Start

本研究では,桁構造半球体を用いた津波避難シェルターの開発を念頭に,比強度に優れる一方向複合材料を用いた桁構造体の健全性評価を可能とする複合荷重状態での桁接合強度評価法を提案する.十字型UD桁試験片を対象に接合部の曲げ負荷下はく離挙動や面内2次元せん断型はく離挙動を呈する試験法を提案し,その場観察による損傷の定量化および結合力要素を用いた損傷進展シミュレーションを併用することにより,桁接合部のはく離挙動を解明することを目的とする.本試験法の妥当性を検証した後,複雑な桁構造体のはく離を含む破壊シミュレーションを実施することにより本研究の有用性を示す.

Outline of Final Research Achievements

In this study, a joint strength evaluation method under multi-axial loading conditions was proposed to evaluate the reliability of crossbeam structures made of unidirectional composite materials, which are lightweight and high-strength materials. By applying bending and in-plane shear loads to a cruciform unidirectional crossbeam specimen, we established a novel test method that exhibits delamination behavior under bending load and in-plane two-dimensional shear delamination behavior at the joints.
The delamination behavior of crossbeam joints was elucidated by combining in-situ damage quantification and damage propagation simulation based on the finite element method using a cohesive element.

Academic Significance and Societal Importance of the Research Achievements

近年,トポロジー構造最適化した複雑なFRP桁構造物が3Dプリンタによって成形され自転車等に実装される例や人工衛星のラティス構造体の実用等,桁構造がCFRP構造物のより高比強度化に寄与している.FRP桁構造体は,身近な生活から宇宙空間までこれまでの概念を覆す注目される構造であり,未解明であった桁接合体はく離挙動の解明は,その解明手法は学術的意義が高く,その構造体の普及は社会的意義においても価値がある.

Report

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

    (7 results)

All 2024 2023 2022 2021

All Presentation (7 results) (of which Int'l Joint Research: 3 results)

  • [Presentation] 撚糸GC製半球桁構造物の圧縮負荷座屈挙動評価2024

    • Author(s)
      河井優衣,本田勝志,野田淳二
    • Organizer
      第15回日本複合材料会議
    • Related Report
      2023 Annual Research Report
  • [Presentation] 津波シェルター用半球体GC桁構造物の圧縮負荷下座屈挙動評価2023

    • Author(s)
      本田勝志,三宅千里,野田淳二
    • Organizer
      第14回日本複合材料会議
    • Related Report
      2023 Annual Research Report
  • [Presentation] Welding joint strength properties for cruciform natural fiber composite2023

    • Author(s)
      J.Noda, T. Yamanaka and S. Hamada
    • Organizer
      23th International Conference on Composite Materials
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 十字型FRP接合材のはく離挙動に及ぼす強化繊維および母材樹脂の影響2023

    • Author(s)
      濱田眞吾,山中大成,野田淳二
    • Organizer
      日本実験力学会2023年度年次講演会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Delamination behacior of welding joint for cruciform natural fiber composites2022

    • Author(s)
      Junji Noda, Taisei Yamanaka
    • Organizer
      20th European Conference on Composite Materials
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] In-plane shear delamination behavior of welding joint for cruciform natural fiber composites2022

    • Author(s)
      Junji Noda, Taisei Yamanaka, Shingo Hamada
    • Organizer
      6th International Conference on Materials and Reliability
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 十字型試験片を用いたGC溶着接合部の面内せん断型はく離挙動2021

    • Author(s)
      山中大成,野田淳二
    • Organizer
      第46回複合材料シンポジウム
    • Related Report
      2021 Research-status Report

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

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