Abstract
Based on the analysis of the strength σNF in the sample fracture with stress concentrators (SC), criteria for the brittleness of metals and alloys was formulated in Communication 2 based on the critical fracture toughness of a metal (Brb, BrCb) under uniaxial tension of samples without SC and with SC (BrNFb, BrNFCb) in a complex stress state. The type of stress-strain state on the strength index of the steel’s structural suitability in the strength-range levels σ0.2 = 150–1200 N/mm2 is shown, as well as on the temperature range of cold resistance of steels ΔT, determined by the load-bearing capacity σNF > σ0.2 for samples with SC. The complex parameter’s key role is noted, which controls the cold resistance level of steel ΔT in the product form of σ0.2 and the critical fracture toughness threshold BrCb, determined experimentally or by calculation using the basic mechanical characteristics of the metal.
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