The role of friction in the yielding of adhesive non-Brownian suspensions

Abstract

Yielding behavior is well known in attractive colloidal suspensions. Adhesive non-Brownian suspensions, in which the interparticle bonds are due to finite-size contacts, also show yielding behavior. We use a combination of steady-state, oscillatory and shear-reversal rheology to probe the physical origins of yielding in the latter class of materials, and find that yielding is not simply a matter of breaking adhesive bonds, but involves unjamming from a shear-jammed state in which the micro-structure has adapted to the direction of the applied load. Comparison with a recent constraint-based rheology model shows the importance of friction in determining the yield stress, suggesting novel ways to tune the flow of such suspensions.

8 pages, 6 figures

References in corpus (4)

• Jamming of frictional spheres and random loose packing
• Onset of mechanical stability in random packings of frictional spheres
• Shear thickening and migration in granular suspensions
• Competing Time Scales Lead to Oscillations in Shear-Thickening Suspensions

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