Abstract
Interpretational limitations of the commonly known models of shear fracture are indicated. Fundamental relationships between brittle and shear fracture occurring at the liquid nitrogen temperature of 77 K are discussed. In particular, the effect of grain size and the condition of grain boundaries on the propagation of shear fracture of 0.09% low-carbon steel at the temperature of 77 K has been determined. An experimental-analytical relation defining the influence of temperature (77–293 K) and grain size on the value of limiting displacements from the perspective of the nucleation and propagation of shear fracture in low- and medium-carbon steels has been formulated. Similarity has been found between the mechanisms of shear fracture at temperatures of 293 and 77 K.
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