Fracture of paste: microstructures governing memory and roles of plastic deformation
| Project/Area Number |
18K03560
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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 13040:Biophysics, chemical physics and soft matter physics-related
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| Research Institution | Nara Women's University |
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Principal Investigator |
Kitsunezaki So 奈良女子大学, 自然科学系, 教授 (00301284)
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| Co-Investigator(Kenkyū-buntansha) |
大信田 丈志 鳥取大学, 工学研究科, 助教 (50294343)
中原 明生 日本大学, 理工学部, 教授 (60297778)
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| Project Period (FY) |
2018-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
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| Keywords | ペーストの破壊 / 記憶効果 / 塑性変形 / レオロジー / ソフトマター |
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| Outline of Final Research Achievements |
Paste-like mixtures of granular material and liquid exhibit the distinctive property of memorizing external perturbation and then forming anisotropic crack patterns. In this research we investigated samples of paste with such memory of shaking or a magnetic field, that were prepared in systematically chosen conditions, and obtained their 3D images by using micro-focus X-ray computerized tomography at the large synchrotron radiation facility Spring-8. Image analysis indicated that the direction of external perturbation is retained as the arrangement or directions of particles, in particular, density fluctuation forming the structure of interstices affects the direction of crack growth. We also reproduced anisotripic arrangements of neighboring particles numerically and revealed the relation between anistropic fracture properties and crack patterns.
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| Academic Significance and Societal Importance of the Research Achievements |
粒子密度が大きく測定や理論的解明が困難であったペースト状物質特有のレオロジーや破壊特性をミクロな構造から解明し、同時に乾燥途中のペースト内部の粒子や成長途中の亀裂をX線CTで可視化できることを示した。この結果は記憶効果の理解とともに、粒子構造の異方性から加えられた外力を推定する方法や、破壊特性の制御につながると期待できる。
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Report
(5 results)
Research Products
(28 results)
