Abstract
A model of cracking in fuel isotropic material weakened by a doubly periodic system of cooling cylindrical channels of round cross section is mathematically described. It is assumed that with increasing intensity of the heat in the material its elastic properties become temperature dependent, and nucleation of cracks and failure of the material occur. It is assumed that the zone of cracks nucleation is a finite length layer containing a material with partially broken connections between separate structural elements in plastic flow state at constant stress. The determination of unknown parameters characterizing the initiating crack is reduced to the solution of a singular integral equation. An analysis of the ultimate state of the zone of the weakened interparticle bonds of the material is realized on the basis of the criterion of critical opening of prefracture zone faces.
Published Version
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