Abstract
The steady-state viscosity, stress relaxation, and stress growth function were measured for a 3.0% by weight dispersion of fumed silica in poly(dimethylsiloxane); using a two-step shear rate history. For short rest times the stress growth function η + increased monotonically towards steady-state, while at long rest times η + exhibited large overshoot followed by a monotonic decrease to steady-state. For intermediate rest times η + exhibited more complicated transient behaviour. The effect of both shear rates in the two-step shear-rate history on η + have been studied, and the resulting rheological behaviour is discussed in terms of phenomenological microstructural models.
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