Internal granular dynamics, shear-induced crystallization, and compaction steps

被引:113
作者
Tsai, JC [1 ]
Voth, GA
Gollub, JP
机构
[1] Univ Penn, Dept Phys, Philadelphia, PA 19104 USA
[2] Haverford Coll, Dept Phys, Haverford, PA 19041 USA
关键词
D O I
10.1103/PhysRevLett.91.064301
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Internal imaging using index matching, and sensitive volume measurement, are used to investigate the spatial order and dynamics of a deep disordered layer of spheres sheared under a fixed load. Shearing triggers a crystallization transition accompanied by a step compaction event. The delay preceding the transition depends strongly on the layer thickness and can require a translation of about 10(5) particle diameters. The mean velocity varies with depth by more than five decades, and its profile is qualitatively altered by the transition.
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页数:4
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