%0 Journal Article
%T Sinking in a bed of grains activated by shearing
%+ School of Earth Science and Engineering
%+ Duke University [Durham]
%+ Laboratoire de Mécanique et Génie Civil (LMGC)
%+ Moyens expérimentaux (Servex)
%A Zheng, Hu
%A Wang, Dong
%A Barés, Jonathan
%A Behringer, Robert
%< avec comité de lecture
%@ 2470-0045
%J Physical Review E
%I American Physical Society (APS)
%V 98
%N 1
%8 2018-07-09
%D 2018
%R 10.1103/PhysRevE.98.010901
%K granular matter
%K sinking
%K shearing
%K photoelasticimetry
%Z Engineering Sciences [physics]/Mechanics [physics.med-ph]Journal articles
%X We show how a weak force f enables intruder motion through dense granular materials subject to external mechanical excitations, in the present case, stepwise shearing. A force acts on a Teflon disk in a two-dimensional system of photoelastic disks. This force is much smaller than the smallest force needed to move the disk without any external excitation. In a cycle, the material plus intruder are sheared quasistatically from γ=0 to γmax, and then backwards to γ=0. During various cycle phases, fragile and jammed states form. Net intruder motion δ occurs during fragile periods generated by shear reversals. δ per cycle, e.g., the quasistatic rate c, is constant, linearly dependent on γmax and f. It vanishes as c∝(ϕc−ϕ)a, with a≃3 and ϕc≃ϕJ, reflecting the stiffening of granular systems under shear [J. Ren, J. A. Dijksman, and R. P. Behringer, Phys. Rev. Lett. 110, 018302 (2013)] as ϕ→ϕJ. The intruder motion induces large-scale grain circulation. In the intruder frame, this motion is a granular analog to fluid flow past a cylinder, where f is the drag force exerted by the flow.
%G English
%2 https://hal.science/hal-01878501/document
%2 https://hal.science/hal-01878501/file/Art_Bar%C3%A8s_al_Phys.Rev.E_2018.pdf
%L hal-01878501
%U https://hal.science/hal-01878501
%~ CNRS
%~ LMGC
%~ MIPS
%~ UNIV-MONTPELLIER
%~ UM-2015-2021