Characterization of Acoustic Emission Signalsby Laurence J. Jacobs, Georgia Inst of Technology, Atlanta, United States,
Abstract: Separation of crack growth signals is of fundamental importance for detecting, locating and determining the significance of an internal flaw using acoustic emission techniques. An analytical method is developed to determine the acoustic emission waveform from a growing crack and the results of this analysis are compared to experimentally obtained values. Within the assumptions of linear elastic fracture mechanics, a two dimensional model is developed to examine a semi-finite crack that, after propagating with a constant velocity, suddenly stops. The analytical model employs the integral equation technique for the analysis of problems of dynamic fracture. The experimental procedure uses an interferometric apparatus that makes localized measurements with very high fidelity without acoustically loading the specimen. The experimental results are used to verify the analytical model.
Subject Headings: Cracking | Acoustic techniques | Emissions | Two-dimensional models | Dynamic analysis | Model analysis | Integrals | Integral equations
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