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High speed thin plate fatigue crack monitorA device and method are provided which non-destructively detect crack length and crack geometry in thin metallic plates. A non-contacting vibration apparatus produces resonant vibrations without introducing extraneous noise. Resulting resonant vibration shifts in cracked plates are correlated to known crack length in plates with similar resonant vibration shifts. In addition, acoustic emissions of cracks at resonance frequencies are correlated to acoustic emissions from known crack geometries.
Document ID
20080004148
Acquisition Source
Headquarters
Document Type
Other - Patent
Authors
Wincheski, Buzz A.
Heyman, Joseph S.
Namkung, Min
Fulton, James P.
Date Acquired
August 24, 2013
Publication Date
February 20, 1996
Subject Category
Structural Mechanics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-5,493,511
Patent Application
US-PATENT-APPL-SN-988084

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