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We present the results of investigations of the influence of the duration of cyclic loading on the kinetics of fracture of A-3 structural steel. We show that the results of testing of specimens for different numbers of loading cycles are similar to the results of testing of the same material in the intact state with concentrators of variable stiffness.
We determine the parameters of acoustic emission that characterize different stages of the process of accumulation of damage, including the onset of the process of coalescence of pores and the initiation and growth of a macrocrack. It is shown that the process of initiation of a tensile macrocrack depends on the size of the stress concentrator, i.e., on the type of stressed state, to a greater extent...