2023 Fiscal Year Final Research Report
Investigation and improvement of interfacial strength between fiber and matrix under impact loading
| Project/Area Number |
21K03779
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 18010:Mechanics of materials and materials-related
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| Research Institution | Doshisha University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
大窪 和也 同志社大学, 理工学部, 教授 (60319465)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 複合材料 / 衝撃 / 界面せん断強度 |
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| 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.
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| Free Research Field |
複合材料
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| 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．
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