2012 Fiscal Year Final Research Report
Study on Relation between Morphological Change of Crack Pattern in Powder Solid and Slow Dynamics
| Project/Area Number |
22540425
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Biophysics/Chemical physics
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| Research Institution | Kanagawa Industrial Technology Center |
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Principal Investigator |
TSURUSAKI Kyoichi 神奈川県産業技術センター, 化学技術部, 主任研究員 (90426388)
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| Co-Investigator(Kenkyū-buntansha) |
SHIRASAKI Ryoen 横浜国立大学, 工学研究院, 准教授 (90251751)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 固形粉体 / 破壊パターン / ガラス転移 / ジャミング転移 |
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| Research Abstract |
The morphological change of broken powder solids defined as fragile solid-like materials, in which a lot of adhesive powders with random sizes are glued each other, has been investigated according to analogies with two transitions in particle systems, the glass and jamming transitions. Concerning to a dynamical property of the adhesive powders, the slow dynamics, which is a typical phenomenon in glassy materials, is observed near the transition point of the morphological change from cracking to crumbling. On the other hand, concerning to a static property of the powder materials such as the mean contact number per a particle versus the volume fraction, the power law function is observed, but the value of the exponent differs from that of reported value near the jamming transition point which is considered to be a universal value as a scaling exponent. Thus, we suggest that the morphological change is not directly related to the jamming transition at least from the view point of the critical phenomena.
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