Low-speed impact craters in loose granular media

被引：215
|
作者：
Uehara, JS [1 ]
Ambroso, MA [1 ]
Ojha, RP [1 ]
Durian, DJ [1 ]
机构：
[1] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
来源：
PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 19期
关键词：
D O I：
10.1103/PhysRevLett.90.194301
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report on craters formed by balls dropped into dry, noncohesive, granular media. By explicit variation of ball density rho(b), diameter D-b, and drop height H, the crater diameter is confirmed to scale as the 1/4 power of the energy of the ball at impact: D-c similar to (rho(b)D(b)(3)H)(1/4). Against expectation, a different scaling law is discovered for the crater depth: d similar to (rho(b)(3/2)D(b)(2)H)(1/3). The scaling with properties of the medium is also established. The crater depth has significance for granular mechanics in that it relates to the stopping force on the ball.
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页数：4
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