Вісник № 1-2. Математичне моделювання в техніці та технологіях
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Документ Mathematical model of the development of a single twin layer inmetal crystals(Національний технічний університет "Харківський політехнічний інститут", 2021) Bosin, Mark Yevgenovych; Gomozov, Yevgen Pavlovych; Drygach, Tetyana GrygorivnaBy analyzing the experimental data available in the scientific literature, a mathematical model of the development of a singletwin layer in metal crystals has been obtained. The model has the form of a differential equation, the order of which is determined by the required accuracy of obtaining the results associated with the solution of this equation. Even in the linear approximation of one of the main parameters of the phenomenological model, the latter gives qualitatively the same dependences of the development of single twins under different loading conditions compared to the experiment. Despite a large number of experimental works devoted to twinning, there is still no rigorous quantitative theory of the development of twinning layers in different media and under different conditions. However, in these works, the mathematical approach was demonstrated only inrelation to elastic twins. This work is an introduction to the creation of a quantitative theory of twinning in metal crystals. Comparisons with the experimental results of the proposed phenomenological model were limited in this work to the task of demonstrating the performance of the model in thesense of predicting the most specific effects of the development of twins under various conditions and loading modes. In particular, the model implies the effect of loss and subsequent restoration of hardening by twin boundaries during stress pulsations, the Bauschinger effect upon a change in the sign of the applied voltage, and a number of other effects observed experimentally on a number of different metal crystals.