Acoustic emission due to nucleation of a microcrack in the proximity of a macrocrack |
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| Authors: | JD Achenbach K-I Hirashima K Ohno |
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| Institution: | 1. Department of Civil Engineering, Northwestern University, Evanston, Illinois 60201, U.S.A.;2. On leave from the Faculty of Engineering, Yamanashi University, Japan |
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| Abstract: | Acoustic emission generated by the nucleation of a microcrack in the proximity of a macrocrack is discussed in this paper. On the basis of some simple approximations the acoustic emission from a crack-opening event is directly related to its crack-opening volume as a function of time. It is shown that the nucleation of a microcrack in the immediate vicinity of a macrocrack generates additional crack-opening volumes for both the macrocrack and the microcrack, whose signals tend to be much larger than those that would emanate from a nucleating solitary microcrack. |
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