Abstract
It was shown that the use of Burgers' model and introduction of the effective viscosity function make it possible to account for general trends in rheologic behavior of different isotropic liquid and solidlike materials: stress relaxation and strain delay, influence of loading or shear rate on a strain curve, curve hysteresis on loading and unloading, and the presence of a stress maximum and its shift at different shear rates for nonlinear-viscous systems. Generally, the rheological model consists of the binomial rheological equation and the modified Maxwell and Kelvin–Voigt differential equations. The model was tested for the case of tangential stresses when studying the polyacrylamide–aluminium acetate solutions and for the normal stresses, when studying the strain of the rock samples saturated with oil.
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