2021 Fiscal Year Final Research Report
Mechanism of the strength of naturally occurring networks and its application
| Project/Area Number |
19K06171
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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 40020:Wood science-related
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| Research Institution | Kyushu University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | ネットワーク / ゲル / パターン / 粘弾性 / ヴィスカスフィンガリング / ひび割れ / セルロース / 非線形現象 |
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| Outline of Final Research Achievements |
It is found various patterns of shapes in nature, such as branching, networks, and so on. They have unique properties to carry some functions. It is important to understand the relationships between the structures and the properties of them. We thus investigated the relationships between the structures and properties of the patterns. The patterns investigated were: (1) tree-like gels formed by viscous fingering and (2) gels fabricated using cracks as templates. The results for (1) showed that the viscoelastic behavior of the viscous fingering networks was shifted to that of typical gels as the branching became more pronounced. A power law was established between the network modulus and the network concentration, and the power was around 3. On the other hand, another power law was also found for (2): the gels fabricated using cracks have a power of 5. These results indicate that there is a correlation between the pattern and properties for the networks in nature.
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| Free Research Field |
高分子材料学
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| Academic Significance and Societal Importance of the Research Achievements |
自然が見せるネットワークには必然的な美しさと強さがあり、そこに潜む機序を探ることで構成要素が少なくても強度が高いネットワークを構築できる可能性がある。本研究の結果から、樹枝状ネットワークについて、パターン構造と粘弾性にはべき乗型の相関があることが明らかにされた。この成果をもとに、構成要素が最小の分率でかつ最大強度を得られるようなネットワークパターンをデザインすることが可能となる。軽量かつ高強度の複合材料を最小のエレメントを用いて作成することは工業的にも重要であり、本研究は学術的なネットワーク科学（基礎）と社会的に重要な複合材料（応用）の橋渡し的な意義を持っていると言える。
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