Effects of Particle Hardness on Shear Thickening Colloidal Suspension Rheology
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Abstract
Concentrated suspensions that reversibly shear thicken have also been reported to show a second shear‐thinning regime at high shear rates and stresses beyond shear‐thickening. We hypothesize that this behavior is due to the elastic particle deformation driven by the high lubrication forces acting between the particles in the hydroclusters. This limiting behavior is described here by an elastohydrodynamic model which predicts a limiting viscosity, η∝γ−1/2 Semi‐quantitative agreement is found by assuming Hertzian contact between the particles and estimating the particle shear modulus. High strain rate compression‐shear split Hopkinson pressure bar (CS‐SHPB) experiments are performed on shear thickening silica dispersions to test for this limiting behavior.
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