MODELLING OF NON-MONOTONOUS FLOW CURVES USING EMPIRICAL CONSTITUTIVE EQUATIONS

摘要

A number of parameters appearing in the 'classical' empirical constitutive equations usually oscillate between two and five. With the onset of new Theologically more complex materials exhibiting non-monotonous behaviour of flow curves this range (2-5) is no longer tenable and more additional parameters are required for a proper description of the flow curves. The present paper analyses this problem for the cases: shear viscosity vs. shear rate and shear viscosity vs. shear stress.