Variations in the oscillatory force Fb on the bottom of a rigid, grain filled column, reveal rich granular dynamics when the column is vertically vibrated with an acceleration amplitude significantly less than the gravitational acceleration at the earth's surface. Large changes in Fb occur even though the maximum relative motion of the container bottom with respect to the wall is less than 2nm. For previously unshaken packings or high frequencies, Fb's dynamics are dominated by grain motion. For moderate driving conditions in already shaken samples, grain motion is virtually absent, but Fb nevertheless exhibits strongly nonlinear and hysteretic behavior, evidencing a granular regime dominated by nontrivial force-network dynamics.
|Original language||English (US)|
|Journal||Physical Review E - Statistical, Nonlinear, and Soft Matter Physics|
|State||Published - Sep 2005|
ASJC Scopus subject areas
- Statistical and Nonlinear Physics
- Statistics and Probability
- Condensed Matter Physics