Microcrack at the extension of dislocation core

Keywords

fracture mechanics, microcrack, internal pressure, deformation energy, surface energy, stress intensity factor.

Cite as

Stashchuk M. H. Microcrack at the extension of dislocation core. Physico­chemical Mechanics of Materials. 2022. 58(2), 095-102.

Abstract

The stress-strain state in a solid crystalline body is determined by solving the problem of the theory of elasticity for an edge dislocation with a cavity on its extension. The cavity is modeled by a microcrack. The relation for the calculation of the energy of a body with such a microcrack under pressure is obtained. The geometrical parameters of the crack-like dislocation cavity and the values ​​of the equilibrium and nonequilibrium crack lengths are given. The critical pressure at which the crack starts at the continuation of the disloca­tion defect is indicated. Stress intensity coefficients are also calculated for such a crack.

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