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IJPAP Vol.44(11) [November 2006] >

Title: Amplitude distribution analysis of acoustic emissions and investigation of the development of brittle fracture in rock
Authors: Rao, M V M S
Lakshmi, K J Prasanna
Keywords: Microcracking
AE b-value
Rock fracture
Issue Date: Nov-2006
Publisher: CSIR
IPC CodeG10K11/16
Abstract: Materials undergoing brittle failure produce large number of acoustic emissions (AE) of varying amplitudes. The most useful way to describe and analyse the AE amplitude distribution is by computing the b-value (slope of the log-linear frequency-magnitude distribution of AE). Conventionally, the b-value of AE is calculated using the methods adopted in seismology since many similarities exist between AE and seismic waves. The b-value is usually obtained either from the cumulative frequency distribution or the discrete frequency distribution of earthquake magnitudes and the same principles hold good for the AE data also. We have carried out the AE amplitude distribution analysis using advanced software (Mistras-2001) and computed the AE b-value using the Gutenberg-Richter relationship for the cumulative frequency distribution data and Aki’s method for the discrete distribution data. The results obtained by both these methods to evaluate the fracture process in a granite rock are compared and discussed as a case study in this paper. Useful inferences about the fractal distribution of crack lengths leading to the dynamic failure of the test rock could also be obtained using the AE b-value data.
Page(s): 820-825
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.44(11) [November 2006]

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