2023 Fiscal Year Final Research Report
Quantification of heterogeneity of epoxy structure and fatigue properties
| Project/Area Number |
21K03752
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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 | University of Hyogo |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | エポキシ樹脂 / 不均一構造 / 動的粘弾性 / 疲労特性 |
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| Outline of Final Research Achievements |
The aim of this project is to clear effect of epoxy network structure on fatigue crack propagation resistance by investigating the relation between network structure and fracture process near the fatigue threshold. First, epoxy materials with different network structure was formed and static and fatigue crack propagation resistance of the bulk epoxy and the adhesive structure was investigated. The enhancement in the inhomogeneity of epoxy network lead to the decrease in the fatigue crack propagation resistance of both bulks and adhesives. Second, It was tried to evaluate the inhomogeneity of network structure by the dynamic mechanical analysis of the epoxy materials with moisture absorption. many types of epoxy-curing agent combination had the inhomogeneous crosslink density. The inhomogeneous structure also could be observed clearly by moisture absorption.
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| Free Research Field |
高分子材料強度学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では，エポキシ樹脂の架橋不均一性に着目し，その可視化に成功し，架橋不均一性が疲労き裂伝ぱ抵抗に影響を及ぼすことを明らかにした。構造用接着剤や繊維強化複合材料では疲労抵抗が重要な特性であり，本結果はミクロな構造を制御することにより疲労抵抗を改善する新たな樹脂組成設計を可能とする。また，今後発展するであろうマテリアルインフォマッティクスを用いた材料設計においてもミクロな構造制御という鍵となる要素の端緒を担うものである。
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