EXPERIMENTAL BACKGROUND FOR THE FATIGUE CRACKS KINETICS SIMULATION

摘要

The paper sets forth the inverse problem of simulating fatigue cracks kinetics, namely, on the basis of the electron microscope analysis of fatigue fractures obtained under harmonic and random loading with variable parameters, to reveal processes inaccessible for direct measurements which take place at the apex of the moving crack, and to construct a kinetics model that fits the processes in question adequately. Experimental foundations for solving this problem have been created. Kinetic effects have been discovered which are testimony to the deep non-linearity of the crack propagation behaviour, which causes a qualitative difference between the nature of the loading amplitude change and the crack propagation rate.