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Unification of the Rheological Physics of Yield Stress Fluids
Krutarth Kamani1, Gavin J Donley1, Simon A Rogers1
1Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Illinois 61801, USA.
Abstract:
The physics above and below the yield stress is unified by a simple model for viscoplasticity that accounts for the nonlinear rheology of multiple yield stress fluids. The model has a rate-dependent relaxation time, allows for plastic deformation below the yield stress, and indicates that rapid elastic deformation aids yielding. A range of commonly observed rheological behaviors are predicted, including the smooth overshoot in the loss modulus and the recently discovered contributions from recoverable and unrecoverable strains in amplitude sweeps.
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