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Transient crater growth in granular targets : An experimental study of low velocity impacts into glass sphere targets

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Title: Transient crater growth in granular targets : An experimental study of low velocity impacts into glass sphere targets
Authors: Yamamoto, Satoru Browse this author
Wada, Koji Browse this author
Okabe, Norihisa Browse this author
Matsui, Takafumi Browse this author
Keywords: cratering
impact processes
collisional physics
Issue Date: Jul-2006
Publisher: Elsevier
Journal Title: Icarus
Volume: 183
Issue: 1
Start Page: 215
End Page: 224
Publisher DOI: 10.1016/j.icarus.2006.02.002
Abstract: We experimentally studied the formation and collapse processes of transient craters. Polycarbonate projectiles with mass of 0.49 g were impacted into the soda-lime glass sphere target (mean diameters of glass spheres are not, vert, similar36, 72, and 220 μm, respectively) using a single-stage light-gas gun. Impact velocity ranged from 11 to 329 m s−1. We found that the transient crater collapses even at laboratory scales. The shape (diameter and depth) of the transient crater differs from that of the final crater. The depth–rim diameter ratios of the final and transient craters are 0.11–0.14 and 0.26–0.27, respectively. The rim diameter of both the transient and final crater depends on target material properties; however, the ratio of final to transient crater diameter does not. This suggests that target material properties affect the formation process of transient craters even in the gravity regime, and must be taken into account when scaling experimental results to planetary scales. By observing impacts into glass sphere targets, we show that although the early stage of the excavation flow does not depend on the target material properties, the radial expansion of the cavity after the end of vertical expansion does. This suggests that the effect of target material properties is specifically important in the later part of the crater excavation and collapse.
Type: article (author version)
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 和田 浩二

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