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Investigation and improvement of interfacial strength between fiber and matrix under impact loading

Research Project

Project/Area Number 21K03779
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 InstitutionDoshisha University

Principal Investigator

Obunai Kiyotaka  同志社大学, 理工学部, 教授 (30614367)

Co-Investigator(Kenkyū-buntansha) 大窪 和也  同志社大学, 理工学部, 教授 (60319465)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords複合材料 / 衝撃 / 界面せん断強度 / 破壊じん性 / 界面強度 / 耐衝撃性 / サブミクロン繊維 / 界面
Outline of Research at the Start

本研究課題では,複合材料総体(マクロな領域)としての衝撃特性および強化繊維-基材樹脂界面というミクロな領域での衝撃特性,具体的には界面せん断強度(IFSS)および,強化繊維-基材樹脂界面に生じる破壊形態のひずみ速度依存性,界面近傍での応力波進展様相を調査する.また,繊維表面処理および樹脂改質によって衝撃荷重下でのIFSS向上を試みる.これらマクロおよびミクロの2方向から得られた知見を総括し関連付けることによって,界面の損傷(ミクロ)から複合材料総体(マクロ)の衝撃特性を予測することを試みる.

Outline of Final Research Achievements

In this research project, various characteristics of composites under impact loading were investigated. Especially, the apparent interfacial shear strength between the reinforcing fibers and the matrix resin under impact loading, which has not been investigated before, was studied. As a result, it was found that in CF/Epoxy composite materials, with an increase in the strain rate, the fracture mode of carbon fibers in the composite changed from tension-dominated to a mixed mode of tension and compression. Additionally, by adding an appropriate amount of submicron glass fibers to the matrix, delamination between the submicron glass fibers and the epoxy resin occurs, suppressing the compressive fracture of carbon fibers and improving the apparent interfacial shear strength.

Academic Significance and Societal Importance of the Research Achievements

本課題では衝撃荷重下における複合材料の強度特性および破壊形態と,繊維-樹脂間の界面せん断強度について調査を行い,両者の関係性を説明するモデルを構築した.本モデルを用いることによって,衝撃荷重下での複合材料の特性を定性的に予測可能となった.また,本課題にて確立した衝撃荷重下における複合材料の界面せん断強度評価手法を応用することによって,衝撃荷重下での複合材料の信頼性向上が可能となる.

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 (7 results) (of which Peer Reviewed: 7 results,  Open Access: 2 results) Presentation (13 results) (of which Int'l Joint Research: 4 results,  Invited: 1 results)

  • [Journal Article] Mechanical characteristics of reclaimed carbon fibre under superheated steam atmosphere and its feasibility for remanufacturing CFRP/CFRTP2024

    • Author(s)
      Obunai K.、Okubo K.
    • Journal Title

      Composites Part A: Applied Science and Manufacturing

      Volume: 176 Pages: 107843-107843

    • DOI

      10.1016/j.compositesa.2023.107843

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 炭素繊維/樹脂間の界面接着せん断強度に及ぼす母材への微細ガラス繊維添加の効果 ‐負荷ひずみ速度の影響‐2024

    • Author(s)
      村山凌太郎,小武内清貴,大窪和也
    • Journal Title

      日本接着学会誌(採択済,印刷中)

      Volume: 60

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effect of Insertion of Controlled Composition Gradient Layer on Mechanical Characteristics of Composite Specimens Made by FDM Type 3D Printer Equipped with Co-axial Extruder2023

    • Author(s)
      Obunai Kiyotaka、Okubo Kazuya、Sanada Kazuki
    • Journal Title

      Seikei-Kakou

      Volume: 36 Issue: 1 Pages: 31-38

    • DOI

      10.4325/seikeikakou.36.31

    • ISSN
      0915-4027, 1883-7417
    • Year and Date
      2023-12-20
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 炭素繊維/樹脂間の界面接着せん断強度に及ぼす繊維表面のサイジング処理効果の負荷ひずみ速度の違いによる変化2023

    • Author(s)
      村山凌太郎,小武内清貴,大窪和也
    • Journal Title

      日本接着学会誌

      Volume: 59 Pages: 65-72

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effect of sub-micron glass fiber addition on CAI strength of UD-CFRP2022

    • Author(s)
      Murayama Ryotaro、Obunai Kiyotaka、Okubo Kazuya
    • Journal Title

      International Journal of Computational Methods and Experimental Measurements

      Volume: 10 Issue: 3 Pages: 271-281

    • DOI

      10.2495/cmem-v10-n3-271-281

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Improvement in Impact Energy Absorption of UD-CFRP by Sub-micron Glass Fiber into Its Matrix2021

    • Author(s)
      Ryotaro Murayama, Kiyotaka Obunai, Kazuya Okubo, Li Bao
    • Journal Title

      Open Journal of Composite Materials

      Volume: 11 Issue: 04 Pages: 82-93

    • DOI

      10.4236/ojcm.2021.114007

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 母材へのセルロースナノファイバ(CNF)添加によるCFRPの振動減衰特性の改善2021

    • Author(s)
      野村 知正,小武内 清貴,大窪 和也
    • Journal Title

      日本複合材料学会誌

      Volume: 47 Pages: 131-136

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] 落錘による面外衝撃負荷下でのUD-CFRPのエネルギ吸収率の改善 ‐母材への微細ガラス繊維添加の効果‐2024

    • Author(s)
      村山 凌太郎,小武内 清貴,大窪 和也
    • Organizer
      日本複合材料会議 JCCM 14
    • Related Report
      2023 Annual Research Report
  • [Presentation] Influence of addition sub-micron glass fibers on energy absorption of UD-CFRP under out-of-plane impact loading due to drop weight2023

    • Author(s)
      Ryotaro Murayama , Kiyotaka Obunai, Kazuya Okubo
    • Organizer
      CANADA-JAPAN COMPOSITES (CJWC13)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 摩擦攪拌穿孔された CFRTP 積層板を用いたボルト締結継手の面圧破壊強度2023

    • Author(s)
      南梨子,小武内清貴,大窪和也
    • Organizer
      日本材料学会 2022年度JCOM若手シンポジウム
    • Related Report
      2022 Research-status Report
  • [Presentation] 母材へのセルロースナノファイバ(CNF)添加によるCFRP積層板のボルト軸力保持率の改善2023

    • Author(s)
      宇賀神友康,小武内清貴,大窪和也,小倉孝太,大坪雅之,峯村淳
    • Organizer
      第14回 日本複合材料会議 JCCM-14
    • Related Report
      2022 Research-status Report
  • [Presentation] Effect of sub-micron glass fiber addition on CAI strength of UD-CFRP2022

    • Author(s)
      Ryotaro Murayama, Kiyotaka Obunai, Kazuya Okubo
    • Organizer
      HPSM/OPTI/SUSI2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Improvement of Damping Properties of Carbon Fiber Reinforced Plastic Modified with Natural Callulose Nano Fibers - Influence of Aspect Ratio -2022

    • Author(s)
      Kazuya Okubo, Kiyotaka Obunai, Tomomasa Nomura
    • Organizer
      The 11th International Conference on Green Composites
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] セルロースナノファイバーを添加したエポキシ系接着剤を用いた接着継手の衝撃強度2022

    • Author(s)
      宇賀神友康,小武内清貴,大窪和也,小倉孝太,大坪雅之,峯村淳
    • Organizer
      材料学会第71期学術講演会
    • Related Report
      2022 Research-status Report
  • [Presentation] 摩擦回転により穿孔された炭素繊維強化熱可塑性プラスチック(CFRTP)板のボルト 継ぎ手強度2022

    • Author(s)
      南梨子,小武内清貴,大窪和也
    • Organizer
      66th FRP CON-EX 2022
    • Related Report
      2022 Research-status Report
  • [Presentation] 同軸押出ノズルを用いて積層造形した異材樹脂複合造形品の機械的特性2022

    • Author(s)
      眞田一輝,小武内清貴,大窪和也
    • Organizer
      プラスチック成型加工学会第30回秋季大会成形加工シンポジア'22
    • Related Report
      2022 Research-status Report
  • [Presentation] UD-CFRPのCAI強度に及ぼす微細ガラス繊維の添加の影響2022

    • Author(s)
      村山 凌太郎,小武内 清貴,大窪 和也
    • Organizer
      第13回 日本複合材料会議 JCCM-13
    • Related Report
      2021 Research-status Report
  • [Presentation] Influence of Bending Bending-Twisting Coupling Deformation on Pure Bending Strength and Fracture Morphology of CFRP Angle -Ply Laminate2022

    • Author(s)
      Kazuki Terasaki, Kiyotaka Obunai and Kazuya Okubo
    • Organizer
      6th International Conference on Material Engineering and Manufacturing
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 繊維/樹脂間の見掛けの界面せん断強度に及ぼす負荷ひずみ速度および繊維表面のサイジング処理の影響2021

    • Author(s)
      村山 凌太郎,小武内清貴,大窪 和也
    • Organizer
      日本材料学会 第70期通常総会
    • Related Report
      2021 Research-status Report
  • [Presentation] 落錘衝撃負荷を受けるUD-CFRPの衝撃吸収エネルギに及ぼす微細ガラス繊維添加の影響2021

    • Author(s)
      村山 凌太郎,小武内清貴,大窪 和也
    • Organizer
      日本材料学会 JCOM若手ウェビナー
    • Related Report
      2021 Research-status Report

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

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