TITLE

Nonlinear acoustic technique of crack location

AUTHOR(S)
Didenkulov, I. N.; Sutin, A. M.; Kazakov, V. V.; Ekimov, A. E.; Yoon, S. W.
PUB. DATE
July 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 524 Issue 1, p329
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
It is known that cracks have high nonlinear elasticity. It causes nonlinear acoustic responses, in particular the modulation of an ultrasound wave passing through or reflected from a crack by low frequency vibration. Such responses can be used for nonlinear acoustic nondestructive evaluation (NANDE). Early developed NANDE techniques based on the use of CW acoustic waves cannot give information on crack location. In this paper new methods of nonlinear acoustic crack location are introduced. They are based on modulation of acoustic pulses reflected from a crack in a solid by low frequency vibration. The first method employs the modulation of a single ultrasound pulse by rather high frequency vibration. This modulation is observed inside one ultrasound pulse. The second method utilizes the modulation of long series of pulses by low frequency vibrations. Both methods were experimentally verified in metal rods. Experiments show that the nonlinear modulation pulse technique can be an effective tool for location and identification of cracks.
ACCESSION #
5665268

 

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