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An experimental study of low-velocity impacts into granular material in reduced gravity

Murdoch, Naomi and Martinez, Iris Avila and Sunday, Cecily and Zenou, Emmanuel and Cherrier, Olivier and Cadu, Alexandre and Gourinat, Yves An experimental study of low-velocity impacts into granular material in reduced gravity. (2017) Monthly Notices of the Royal Astronomical Society, vol. 468 (n° 2). pp. 1259-1272. ISSN 0035-8711

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Official URL: https://doi.org/10.1093/mnras/stw3391

Abstract

In order to improve our understanding of landing on small bodies and of asteroid evolution, we use our novel drop tower facility \citep{sunday2016} to perform low-velocity (2 - 40 cm/s), shallow impact experiments of a 10 cm diameter aluminum sphere into quartz sand in low effective gravities (~0.2 - 1 m/s^2). Using in-situ accelerometers we measure the acceleration profile during the impacts and determine the peak accelerations, collision durations and maximum penetration depth. We find that the penetration depth scales linearly with the collision velocity but is independent of the effective gravity for the experimental range tested, and that the collision duration is independent of both the effective gravity and the collision velocity. No rebounds are observed in any of the experiments. Our low-gravity experimental results indicate that the transition from the quasi-static regime to the inertial regime occurs for impact energies two orders of magnitude smaller than in similar impact experiments under terrestrial gravity. The lower energy regime change may be due to the increased hydrodynamic drag of the surface material in our experiments, but may also support the notion that the quasi-static regime reduces as the effective gravity becomes lower.

Item Type:Article
Additional Information:Thanks to Oxford University Press editor. The definitive version is available at https://academic.oup.com/mnras/article-abstract/468/2/1259/2804516/An-experimental-study-of-low-velocity-impacts-into?redirectedFrom=fulltext
HAL Id:hal-01514901
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Ecole nationale supérieure des Mines d'Albi-Carmaux - IMT Mines Albi (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > National Aeronautics and Space Administration - NASA (USA)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > California Institute of Technology - Caltech (USA)
Laboratory name:
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Deposited By: Naomi Murdoch
Deposited On:26 Apr 2017 13:39

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