Sensitivity of Granular Force Chain Orientation to Disorder-Induced Metastable Relaxation

Sensitivity of Granular Force Chain Orientation to Disorder-Induced Metastable Relaxation

A two-dimensional system of photoelastic disks subject to vertical tapping against gravity was experimentally monitored from ordered to disordered configurations by varying bidispersity. The packing fraction ϕ, coordination number Z, and an appropriately defined force-chain orientational order param...

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Bibliographic Details
Published in:Physical review letters Vol. 116; no. 12; p. 128001
Main Authors: Iikawa, N, Bandi, M M, Katsuragi, H
Format: Journal Article
Language:English
Published: United States 25-03-2016
Subjects:
Coordination numbers
Disks
Disorders
Gravitation
Metastability
Order parameters
Tapping
Two dimensional
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Summary:A two-dimensional system of photoelastic disks subject to vertical tapping against gravity was experimentally monitored from ordered to disordered configurations by varying bidispersity. The packing fraction ϕ, coordination number Z, and an appropriately defined force-chain orientational order parameter S all exhibit as similar sharp transition with a small increase in disorder. A measurable change in S, but not ϕ and Z, was detected under tapping. We find disorder-induced metastability does not show configurational relaxation, but can be detected via force-chain reorientations.
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ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.116.128001