Abstract

A physicomechanical analysis is made of the conditions under which brittle fracture occurs in bcc metals. A criterion of brittle fracture is formulated on the basis of a quantitative description of the nucleation, starting, and propagation of microscopic cleavage cracks in a substructure that undergoes alteration in the course of deformation. A theoretical analysis is made of the effect of microstresses and the deformational substructure of the material on the critical stress for brittle fracture, and the propagation of brittle microcracks within the substructure is studied experimentally. An examination is made of the general laws that govern the effect of preliminary plastic deformation on the parameters in the brittle fracture criterion and on the fracture toughness of the material.

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