2013/09/27 by Somayeh Farhadi, Farhadi, Somayeh, Robert P Behringer +5
Earth and Planetary Sciences · Engineering · Physics and Astronomy · #FOS: Physical sciences #Granular flow and fluidized beds #High-pressure geophysics and materials #Nonlinear Photonic Systems #Soft Condensed Matter (cond-mat.soft) #cond-mat.soft
paper · pdf · doi:10.48550/arxiv.1309.7147
5 pages
arxiv created 2013/09/27 · openalex publication_date 2013/09/27 · arxiv updated 2013/09/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We have explored isotropically jammed states of semi-2D granular materials through cyclic compression. In each compression cycle, systems of either identical ellipses or bi-disperse 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, ϕm, above which P persists over many cycles; below ϕm, 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, due to the rotational constraints on elliptical particles.