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The phenomenon of shear-induced jamming is a factor in the complexrheological behavior of dense suspensions. Such shear-jammed states arefragile, i.e., they are not stable against applied stresses that areincompatible with the stress imposed to create them. This peculiar flow-historydependence of the stress response is due to flow-induced microstructures. Toexamine jammed states realized under constant shear stress, we perform dynamicsimulations of non-Brownian particles with frictional contact forces andhydrodynamic lubrication forces. We find clear signatures that distinguishthese fragile states from the more conventional isotropic jammed states.

Shear jamming and fragility in dense suspensions