TY - JOUR
T1 - Experimental and computational studies of jamming
AU - Song, Chaoming
AU - Wang, Ping
AU - Potiguar, Fabricio
AU - Makse, Hernán A.
PY - 2005/6/22
Y1 - 2005/6/22
N2 - Jamming is a common feature of out-of-equilibrium systems showing slow relaxation dynamics. Here we review our efforts in understanding jamming in granular materials using experiments and computer simulations. We first obtain an estimation of an effective temperature for a slowly sheared granular material very close to jamming. The measurement of the effective temperature is realized in the laboratory by slowly shearing a closely packed ensemble of spherical beads confined by an external pressure in a Couette geometry. All the probe particles, independent of their characteristic features, equilibrate at the same temperature, given by the packing density of the system. This suggests that the effective temperature is a state variable for the nearly jammed system. Then we investigate numerically whether the effective temperature can be obtained from a flat average over the jammed configuration at a given energy in the granular packing, as postulated by the thermodynamic approach to grains.
AB - Jamming is a common feature of out-of-equilibrium systems showing slow relaxation dynamics. Here we review our efforts in understanding jamming in granular materials using experiments and computer simulations. We first obtain an estimation of an effective temperature for a slowly sheared granular material very close to jamming. The measurement of the effective temperature is realized in the laboratory by slowly shearing a closely packed ensemble of spherical beads confined by an external pressure in a Couette geometry. All the probe particles, independent of their characteristic features, equilibrate at the same temperature, given by the packing density of the system. This suggests that the effective temperature is a state variable for the nearly jammed system. Then we investigate numerically whether the effective temperature can be obtained from a flat average over the jammed configuration at a given energy in the granular packing, as postulated by the thermodynamic approach to grains.
UR - http://www.scopus.com/inward/record.url?scp=21044455162&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=21044455162&partnerID=8YFLogxK
U2 - 10.1088/0953-8984/17/24/025
DO - 10.1088/0953-8984/17/24/025
M3 - Article
AN - SCOPUS:21044455162
VL - 17
SP - S2755-S2770
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
SN - 0953-8984
IS - 24
ER -