Abstract
In this work we study shear reversals of dense non-Brownian suspensions composed of cohesionless elliptical particles. By numerical simulations, we show that a new fragility appears for frictionless ellipses in the flowing states, where particles can flow indefinitely in one direction at applied shear stresses but shear jam in the other direction upon shear stress reversal. This new fragility, absent in the isotropic particle case, is linked to the directional order of the elongated particles at steady shear and its reorientation at shear stress reversal, which forces the suspensions to pass through a more disordered state with an increased number of contacts in which it might get arrested.
Highlights
Both granular matter and dense suspensions have been studied extensively during the last decades due to their industrial and geological relevance and rich physics [1]
One remarkable property of suspensions is that even though the particles flow in a Stokes flow, particles do not always respect reversibility when exposed to shear reversal [12,13], a property usually associated with Stokes flows [14]
Increasing the packing fraction further, shear-jammed states start to appear upon shear reversal [see Figs. 1(c) and 1(d)]
Summary
Both granular matter and dense suspensions have been studied extensively during the last decades due to their industrial and geological relevance and rich physics [1]. Small oscillatory strains seem to deactivate frictional forces, leading to higher shear-jamming packing fractions for frictional particles [19]. Increasing the packing fraction further, shear-jammed states start to appear upon shear reversal [see Figs.
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