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Abstract The change in the spatial distribution of acoustic emission sources in the course of the deformation and fracture of samples of materials and rocks is accompanied by changes in the amplitude distribution of the received signals because of the geometric spread of the elastic wave front. It is customary to characterize the amplitude distributions of acoustic emission signals in terms of the b value (the slope of the differential amplitude distribution). In particular, the localization of the sources may cause a decrease in the b value, which is usually interpreted as a precursor of macrofracture. A correct interpretation of the decrease in the b value is only possible if the location of the sources in space is accomplished and a correction for the spread and attenuation of elastic waves is introduced.
Acoustical Physics – Springer Journals
Published: Jun 1, 2005
Keywords: Acoustics
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