Studying the evolution of the power spectra of acoustic radiation during the destruction of a solid body

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

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作者简介

V. Belikov

Institute of Geophysics UrB RAS

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Email: belik2a@mail.ru
俄罗斯联邦, 620016 Yekaterinburg, Amundsen st., 100

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2. Fig. 1. Amplitude-frequency spectra of AE at time points t1 and t2. The dotted line is the moment of time t1, the solid line is the moment of time t2.

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3. Fig. 2. Distribution of relative values of acoustic radiation power Cr rel : b = 0.1 microns (a); b = 0.4 microns (b); b = 0.7 µm (c); b = 1 µm (d). The dashed line is the moment of time t1, the solid line is the moment of time t2.

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