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Shear stress

  Isaac Newton was the first to express the basic law of rheology describing the flow behavior of an ideal fluid:

199(21.1)

    where 201 is shear stress in fluid, 202 is apparent viscosity of fluid and 202 1 is shear rate. Apparent viscosity coefficient 202 needn’t be a constant as will be shown in this work.

For simple shear rate rules:

200(21.2)