Cyclic Elasto-Plastic Fracture Diagram as Applied to a Specimen with Crack

This Analytical and experimental method for the estimation of crack growth resistance under cyclic elasto-plastic deformation based on measuring of local plastic strain near the crack tip and is proposed. Diagram of cyclic elasto-plastic fracture of a specimen with crack is constructed as an integral characteristic in terms of nonlinear fracture mechanics. This diagram is the dependence between stress intensity factor determined with the account of plasticity and transverse component of residual strain. A set of cyclic crack growth resistance parameters of plastic steel is determined according to this diagram. Introduction Analytical and experimental method for the estimation of crack growth resistance under cyclic elasto-plastic deformation based on measuring of local plastic strain near the crack tip and is proposed. Diagram Construction Method. The section headings are in boldface capital and lowercase letters. Considering that plastic steel was subjected to test an estimation of applicability of basic formulas of linear elastic fracture mechanics was made. Observance of flat deformation conditions was checked by criteria [14]: ; 5 , 2 / σ 2 , 0 0 * t K K I I   (1)