Shtayura S. Estimation of static crack growth resistance deformation parameters of middle- and low-strength steels.

The dissertation is devoted to the problems of experimental has been determination of basic parameters for deformation models of fracture. The experimental - analytical approach for determination of crack tip opening displacement and cohesive stress for middle- and low-strength steels proposed. The influence of several factors on critical crack tip opening displacement is considered and the dominant influence on it of plastic component of its faces displacement is shown. The requirements standard for determination of crack tip opening are specified, the invariance of cohesive stress concerning, the force loading condition, scale factor and its dependence on tempering temperature is established. The characteristics of generalized dс-model are determined, the deformation criterion of fracture for brittle bodies with splits of arbitrary curvature radius is formulated. The results of researches are used for of specialists training.