Stress versus strain controlled shear: Yielding and relaxation of concentrated colloidal suspensions

In rheological experiments, the relationship between stress and strain is determined. transient regime, this may depend on which of these properties applied measured. general, data collected using one or other as control parameter are not necessarily equivalent. Moreover, assumed steady state relaxation following might whether has been applied. We examined colloidal suspensions with concentrations around glass transition compared their response to strain, in particular, after start-up shear, state, cessation shear. After behavior was found significantly sample exposed a constant shear rate stress. Nevertheless, transients lead that independent how it reached, long yielding occurred corresponding under shows both similarities differences. This quantified based on, e.g., hydrodynamic, Brownian, residual well recovered strain. addition, responses rheometers abrupt changes have characterized. The technical presented taken into account interpretation.