Abstract
The state of the art in the field of estimating the fracture toughness of ductile steels using the parameters of indentation by a spherical indenter is considered. Relations to calculate the specific indentation energy of a sphere using the diameter of a recovered impression are received. A method is developed to estimate the critical stress intensity factor for the plane strain state of pipeline and vessel steels using the parameters of indentation by a spherical indenter performed on a standard stationary Brinell hardness tester.
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