Abstract
A technique for the study of acoustic emission during high-cycle-fatigue crack propagation has been developed. Difficulties resulting from complex emission behavior and the low signal-to-noise ratio encountered in this type of test are rectified by three methods: minimization of mechanical noise; separation of noise causes according to position in the loading cycle; and rejection of noise from sources other than the crack by a short-time correlation method. The approaches are discussed and data from a fatigue test are presented demonstrating accoustic-emission behavior for crack-growth rates from 3×10−6 in./cycle to 70×10−6 in./cycle.
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References
Tatro, C. A., “Experimental Considerations for Acoustic Emission Testing,”Matl. Res. and Stand., MTRSA,11 (3),17 (March1971).
Morton, T.M., Lewis, R. E. andHarrington, R. M., Acoustic Emission Research-1971, LMSC D266144, Lockheed Missiles & Space Company, Inc., Sunnyvale, CA (1972).
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This work was funded by the Lockheed Independent Research Program.
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Smith, S., Morton, T.M. Acoustic-emission detection techniques for high-cycle-fatigue testing. Experimental Mechanics 13, 193–198 (1973). https://doi.org/10.1007/BF02322652
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DOI: https://doi.org/10.1007/BF02322652