Abstract
A thermodynamic model of the loading diagram for the standard sample as an open system, which has critical points of second-order phase transitions with the formation of dissipative structures (by Prigozhin) and excludes the angular points, is suggested. The model is based on three postulates: the reversible nonlinear elastic deformation (by Cauchy), the parabolic mechanism of dislocation strengthening, and parabolic softening of the defects. The lifetime of the deformation of the sample (the material point) is determined as an integrated evaluation, which depends on coordinates and time. The model can be used to solve elastoplastic problems at small deformation and to evaluate the current lifetime.
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