Rolling constraints let frictional force chains in dense suspensions stay stable without orthogonal support, producing fewer hubs, more rattlers, and lower jamming fractions.
The role of friction in the yielding of adhesive non-Brownian suspensions
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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.
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Frictional Contact Network in Dense Suspension Flow
Rolling constraints let frictional force chains in dense suspensions stay stable without orthogonal support, producing fewer hubs, more rattlers, and lower jamming fractions.