Modification of strength criteria and plasticity’s conditions in calculation of pavements

Abstract

The article dwells upon the impact of accumulative damages on strength and placticity of materials. The authors have attempted to modify the original criteria of strength and plasticity’s conditions, based on a conventional method of accounting this phenomenon. This method consists in indroduction of measures of damage’s theory, to which the y continuity of L.M. Kachanov and w damage of Y.N. Rabotnov are traditionally refered in the limiting state equation. One of these measures is contained in a function, which is a multiplier to a stress tensor, that allows to convert the tensor of the undamaged solid into the stress tensor of the damaged solid. There are considered opportunities of such modification, both for simple criteria of Drucker - Prager, Lade-Dunkan, Mattsuoka-Nakai, Mohr-Coulomb and modern multi-surface criteria for the calculation of strength and shear strength, respectively.

Keywords

• критерий прочности
• условие пластичности
• поврежденность ю. н. работнова
• сплошность л. м. качанова
• критерий двойного сдвига