Unification of the Rheological Physics of Yield Stress Fluids
Krutarth M. Kamani, Gavin J. Donley, Simon A. Rogers
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.
Topics & Concepts
ViscoplasticityRheologyYield (engineering)Stress relaxationDeformation (meteorology)Stress (linguistics)ViscoelasticityMaterials scienceMechanicsRelaxation (psychology)PhysicsThermodynamicsConstitutive equationComposite materialCreepFinite element methodSocial psychologyPhilosophyLinguisticsPsychologyRheology and Fluid Dynamics StudiesPolymer crystallization and propertiesInjection Molding Process and Properties