TITLE

Coating evaluation using analytical and experimental dispersion curves

AUTHOR(S)
Knight, B.; Hussain, M.; Frankel, J.; Cox, J. F.; Braunstein, J.; Cote, P. J.; Abbate, A.
PUB. DATE
May 2000
SOURCE
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p263
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A useful means of increasing the S/N ratio when using laser generated ultrasonic surface waves is to generate in a circular annulus and detect at the center of the circle with a laser interferometer. We have generated in a circle or arc, to study electroplated chromium coatings on steel. The coating and substrate properties can be discussed in terms of the velocities of different surface wave frequencies. The velocities and hence the dispersion curves were obtained by a wavelet technique in specimens where coating quality and heat treatment were varied. Analytically we formulate the problem as a finite plate on an unbounded medium using three-dimensional dynamical equations. Generation is in a circle or an infinite line. To distinguish the response due to a cracked or weakly bonded interface we compute the dispersion curves under different boundary conditions. Our experimental data is discussed in terms of these results. © 2000 American Institute of Physics.
ACCESSION #
6029123

 

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