Journal article

Friction and Hertzian contact in granular glass

We study the jamming process arising in granular systems subjected to decreasing external vibration, which has features similar to the cooling of glass-forming liquids. We modify the friction between grains and observe that jamming occurs 'more easily' for grains with higher surface roughness. To understand the observed behavior we present a detailed analysis of the elastic and tribological phenomena at the length scale of the grains in contact and provide a qualitative model, where the Hertzian nonlinear elastic contact between grains plays a relevant role.


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