Many diverse materials, including some which are very unlikely to have a structure such as is postulated byCasson, obey his equation for shear-thinning plastic bodies. When the data range over only one or one and a half decades, as is usual, the curves cannot be visually distinguished from those using theHerschel andBulkley equation for which some explanation, depending much less on any specific type of structure, is already available. It also seems probable that the two equations are indistinguishable if both are transformed to allow for small “negative yield-values” in dilatant systems.
KeywordsPolymer Half Decade Plastic Body Diverse Material Dilatant System
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