Abstract
In this paper, the flow curve (the constitutive relation between shear stress and rate of shear) of a non-Newtonian fluid (liquid) is investigated on the basis of the first author's inelastic deformation theory. The theory is the combined deformation mechanism model and was proposed to explain the inelastic behavior of solids in the previous paper. The application of the theory to the flow curves of Newtonian, pseudoplastic, Bingham, plastic, and dilatant fluids leads to the possibility of the systematic explanation for these flow curves. The effect of temperature on the flow curve is also well explained. The theoretical considerations of the measurement values obtained by various researchers lead to the establishment of a maximum limit of rate of shear, which is assumed in the proposed constitutive equation.
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