2017 Fiscal Year Final Research Report
Measurement of electromagnetic waves generated by impact fracture of igneous rocks and sedimentary rocks and solution of its mechanism
| Project/Area Number |
15K05676
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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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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Osaka University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
谷垣 健一 大阪大学, 基礎工学研究科, 助教 (40631875)
堀川 敬太郎 大阪大学, 基礎工学研究科, 准教授 (50314836)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Keywords | 人工水晶 / 花崗岩 / 斑れい岩 / 閃緑岩 / 圧縮破壊 / ホプキンソン棒法 / 電磁波 / 二点ゲージ計測法 |
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| Outline of Final Research Achievements |
In first two years, we studied about the clarification of the relationship between the mechanical properties of synthetic quartz and the electromagnetic phenomena during its fracture A series of uniaxial compression tests were carried out at quasi-static and dynamic rates. Not only the stress-strain curves but also the electromagnetic waves generated during the fracture of specimens were measured in a shield box made of permalloy plates. The dynamic compressive strength was greater than those in static tests and there is strain-rate dependence in their strength of synthetic quartz. It was also found that the electromagnetic phenomenon does not depend on the loading direction even at dynamic rate.
In the 3-rd year, some uniaxial compression tests for granite, gabbro and diorite were performed at quasi-static and dynamic rates. Relatively large electromagnetic waves were measured when these rocks fractured even at quasi-static rates.
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| Free Research Field |
構造強度学、材料力学、植物バイオミメティックス
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