Boots – shoes – and leggings
Patent
1992-12-08
1996-02-20
Voeltz, Emanuel T.
Boots, shoes, and leggings
364506, 364507, 73577, 73799, 73801, 73668, G01H 1100
Patent
active
054935113
ABSTRACT:
A 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.
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Fulton James P.
Heyman Joseph S.
Namkung Min
Wincheski Buzz A.
Administrator, National Aeronautics and Space Administration
Edwards Robin W.
Helfrich George F.
Voeltz Emanuel T.
Wachsmann Hal P.
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