Stress Relaxation for Granular Materials near Jamming under Cyclic Compression.


Journal Article

We have explored isotropically jammed states of semi-2D granular materials through cyclic compression. In each compression cycle, systems of either identical ellipses or bidisperse disks transition between jammed and unjammed states. We determine the evolution of the average pressure P and structure through consecutive jammed states. We observe a transition point ϕ_{m} above which P persists over many cycles; below ϕ_{m}, P relaxes slowly. The relaxation time scale associated with P increases with packing fraction, while the relaxation time scale for collective particle motion remains constant. The collective motion of the ellipses is hindered compared to disks because of the rotational constraints on elliptical particles.

Full Text

Cited Authors

  • Farhadi, S; Zhu, AZ; Behringer, RP

Published Date

  • October 29, 2015

Published In

Volume / Issue

  • 115 / 18

Start / End Page

  • 188001 -

PubMed ID

  • 26565498

Pubmed Central ID

  • 26565498

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/physrevlett.115.188001


  • eng