Measuring and testing – Vibration – By mechanical waves
Patent
1996-04-30
1998-02-03
Williams, Hezrone E.
Measuring and testing
Vibration
By mechanical waves
73652, G01N 2914, G01N 2924
Patent
active
057146870
ABSTRACT:
An apparatus for detecting and measuring cracks in plate-like structures using acoustic emission technique is disclosed. A false aperture transducer is formed by bonding a mass-loading component to and partially covering a small circular portion of the center surface of a larger aperture piezoelectric disk. In this manner, only a small part of the piezoelectric material in the center of the disk is mass-loaded and very sensitive to low frequency flexure waves created by out-of-plane sources while the remainder of the disk is unloaded and sensitive to high frequency extensional and shear waves created by in-plane sources.
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patent: 5029474 (1991-07-01), Schulze
patent: 5191558 (1993-03-01), Gorman et al.
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"Plate Wave Acoustic Emission"; Michael R. Gorman; J. Acoustics Society of America (Jul. 1991).
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"Experimental Far-Field Wideband Acoustic Waves in Wood Rods and Plates"; M. A. Hamstad et al.; Proceedings of the 9th International Symposium on Nondestructive Testing of Wood; Conferences & Institutes, Washington State University (1994).
"Accurate Simulation of Acoustic Emission Sources in Composite Plates"; W. H. Prosser and M.R. Gorman; 1994 ASNT Spring Conference (1994).
"The DECI Report"; H.L. Dunegan (Jun. 1995).
"The Use of Plate Wave Analysis in Acoustic Emission Testing to Detect and Measure Crack Growth in Noisy Environments"; H.L. Dunegan; 1996 Structural Materials Technology NDE Conference (1996).
Miller Rose M.
Williams Hezrone E.
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