Determination of rheological parameters of soft media strained with acceleration and Inertia

As a result of the study of the rheological properties of soft fluids, it was determined that the melt in a certain range of strain rates exhibits the properties of non-Newtonian media. By processing the experimentally obtained soft fluid flow curves and using the averaged type of the rheological equation of the medium deformable accelerated and by inertia, the rheological parameters were determined - linear density coefficients and - limiting dynamic stresses for six intervals of variation of stresses and strain rates by the feed melts. It has been established that with increasing humidity and temperature of soft fluids, limiting stresses and linear densities decrease. The method consists in determining the immersion force of a conic indenter with a constant velocity and a coefficient that takes into account the shear zones, as well as the angle formed by the boundaries of the zone of medium straining. The magnitude of the force, depending on the velocity gradient, is plotted on the graph. In particular, according to the law of Newton viscous flow, under the action of stress, the fluid instantly acquires a strain rate, i.e., it flows, and when the stress is removed, it stops instantaneously. This structure causes one of the characteristic features of mixtures - the presence of linear density expressing an inert resistance to accelerated strains, and depending on accelerated strain. By connecting these simplest models in series and/or parallel, one can obtain a composite model, its parameters being close to the properties of the real body.

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