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Abstract
A modified criterion of brittle fracture, a necessary condition of which, the condition of origin of microcracks, is plastic deformation until some value of ɛ0 dependent upon temperature, is experimentally substantiated. An experimental-calculation method is developed for determination of the relationship of ɛ0 to temperature T, on the basis of which the ɛ0(T) relationship is obtained for type 15Kh2MFA steel. It is shown that the proposed formulation of the criterion of brittle fracture makes it possible to consistently describe the fracture processes with different stressed and strained states of the material.
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