FIELD: measurement technology.
SUBSTANCE: invention relates to the field of measurements, in particular to the investigation of the characteristic of fracture toughness of parts and structures, and is aimed to increase the productivity, information value of the method and expansion of its scope. Essence: a diamond tetrahedral pyramid is pushed into the surface of the test material, followed by a full discharge, during the test, the indentation diagram is continually recorded in the coordinates “load-depth of impression” and then due to the first fracture on the load line of the indentation diagram, the load Fc and related to the load depth of the imprint tc are determined, upon which the specific work of elastoplastic deformation is calculated ωc, necessary for the formation of the first crack, as: 
, where 
– absolute work of elastoplastic deformation under reaching Fc and tc, 
– elastoplastic volume of footprint with depth tc.
EFFECT: increase in productivity, informative value of the method and expansion of its scope.
1 cl, 1 dwg
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