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The yielding of concentrated cohesive suspensions can be deformation-ratedependent. One consquence of this is that a single suspension can present inone several different ways, depending upon how it is tested, or more generally,how it is caused to flow. We have seen variously Herschel-Bulkley flow, highlynon-monotonic flow curves and highly erratic or chaotic yield, all in onesuspension. In controlled-rate testing one sees a systematic effect ofdeformation rate. In controlled stress testing, matters are more subtle.Whereas step-stress creep testing will elicit reproducible behaviour, anyattempt to determine a flow curve by, e.g. stepping up or sweeping stress at aninappropriate rate can lead to highly irreproducible behaviour.

The yielding of concentrated cohesive suspensions can be deformation rate dependent