Analysis of the curve of cyclic elastoplastic fracture of a specimen with a crack. Report no. 2

A new method is used to experimentally establish the laws governing the cyclic and quasistatic final fracture of compact specimens of steels 30 and 45. Specimen thicknesses are 10, 20, and 40 mm. It is proposed that the curve describing the cyclic elastoplastic fracture of a specimen be constructed with allowance for the actual load acting on the specimen during final fracture (the CEPFSC Q-curve). Q-curves are analyzed for specimens of different thicknesses and a method is described for constructing a curve that generalizes (for specimens of different sizes) both types of CEPFSC curves for the given steels on the basis of suitable similarity transformations.