Abstract
In the paper a one-dimensional model with the mixed combination of three nonlinear viscous elements is considered, and the influence of the model parameters on the adequate description of the characteristic properties of the superplastic processes is inves-tigated. Inessential parameters are excluded analytically, and the types of the stress vs. strain rate dependencies, obtained by the numerical modelling, are classified. Domains in the parameter space of the nonlinear viscous elements are found where the su-perplastic curve is sigmoid.
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