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Perturbative Frictional Jamming
Speaker Prof. Maruthi Mahesh Bandi, Okinawa Institute of Science and Technology
Graduate University
Date 30 July 2019 (Tuesday)
Time 15:30 - 17:00
Venue Room 4502 (Lift 25-26), HKUST

It is well known that external perturbations evolve a frictional granular pack jammed in an initial metastable configuration to an eventual stable one. Beneficial in achieving efficient packing, athermal perturbations can also cause failure. Understanding pack response to perturbations naturally carries both fundamental and applied significance. In a related context, the power-law pressure P increase against packing fraction X is considered one signature of the frictionless jamming transition. In contrast, independent studies reveal frictional jamming exhibits an initial exponential pressure rise before deviating towards the putative power-law. The range of Φ over which pressure rises exponentially is marked by a marginally stable solid (fragile state) sensitive to perturbations. In this talk, I report experiments on frictional granular pack pressure response to controlled perturbations in this fragile state.