The article establishes a connection between the crack resistance of low and medium-strength steels and the grain structure of the material, its strain hardening, temperature and strain rate. A method is proposed for determining the temperature dependence of the static and dynamic crack resistance of these steels by testing a cylindrical sample at one (room) temperature.

This work solves one of the key problems in the field of fracture mechanics, namely, the determination of the crack resistance of the most widely used structural steels, in which the determination of this characteristic according to the existing standard requires testing samples with a crack weighing more than a ton, and according to the method used in this work, testing smooth cylindrical samples without a crack in uniaxial tension.