2016 Fiscal Year Final Research Report
Study on evolution of small bodies by impact experiments on granular media under different simulated gravity
| Project/Area Number |
25400453
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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 |
Solid earth and planetary physics
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| Research Institution | Kobe University |
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Principal Investigator |
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| Research Collaborator |
KIUCHI MASATO 神戸大学, 大学院理学研究科, 大学院生
OMURA TOMOMI 神戸大学, 大学院理学研究科, 大学院生
GUETTLER CARSTEN 神戸大学, 大学院理学研究科, 学振外国人特別研究員
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Keywords | 小惑星 / 衝突 / 数値シミュレーション / レゴリス |
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| Outline of Final Research Achievements |
In order to understand the impact cratering on the regolith layer of small bodies, we developed a simulated low gravity collision experiment device and conducted a low speed impact crater formation experiment in the range of 0.01 - 1 G at atmospheric pressure and below 10 Pa. It was found that the crater diameter is proportional to about -0.2 power of gravitational acceleration. We also gained an empirical relationship on the gravitational dependence of the porosity of the granular layer. On the other hand, we experimentally show the case where inter-particle force dominates gravity and even if the gravity decreases, the crater diameter does not become larger as expected. On the other hand, numerical simulation showed that the amount of ejecta from impact cratering does not depend on particle interactions, i.e. restitution coefficient and friction coefficient that lead to energy dissipation.
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| Free Research Field |
惑星科学
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