Stick-slip and force chain evolution in a granular bed in response to a grain intruder
Antoinette Tordesillas, James E Hilton, Steven T Tobin
PHYSICAL REVIEW E | AMER PHYSICAL SOC | Published : 2014
The mechanical response of granular beds under applied stresses is often characterized by repeated cycles of stick-slip. Using the discrete element method, we examine stick-slip from a concentrated force loading-imposed by a single grain that is drawn through a densely packed, periodic granular bed via a stiff virtual spring. Force chains continually form and collapse ahead of the intruder grain. A comprehensive characterization of the birth-death evolution of these load-bearing structures, along with their surrounding contact cycles, reveals a well-defined shear zone of around eight particle diameters from the intruder, encapsulating: (i) long force chains that form buttresses with the fixe..View full abstract
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Awarded by Australian Research Council
Awarded by US Army Research Office
We thank Jack Hopper for assistance in the preparation of this manuscript. We acknowledge the support of the Australian Research Council (Discovery Grant No. DP120104759), the US Army Research Office (Single Investigator Grant No. W911NF1110175), and the Melbourne Energy Institute.