Studying the Evolution of the Power Spectrum of Acoustic Emission during Solid Body Destruction

When interpreting acoustic emission (AE) observation data, a model of a crack in the form of a cavity shaped like an oblate ellipsoid of revolution is used. When the length of its minor semiaxis tends to zero, the ellipsoid models a circular disk-shaped crack. Distributions of the acoustic emission power along the lengths of the semiaxes of the ellipsoidal cavities are constructed using the data from two amplitude-frequency AE spectra recorded during the destruction of a concrete sample. It is shown that by the time the second spectrum is recorded, a redistribution of acoustic emission occurs in favor of a discrete set of growing main cracks with high semimajor axis lengths and a small opening value.