Abstract
Abstruct-A series of direct optical measurements of ultrasonic waves which propagate along the boundaries between solids is reported in this paper. Specifically, the normal component of wave motion at the interface has been measured for several pairs of substrates which approximately satisfy the material relationships required for Stoneley wave existence. Superimposed standing and traveling interface waves have been generated on these pairs by surface and bulk acoustic wave mode conversion. Qualitatively similar wave motions have been observed on the interfaces between polished substrates 1) optically wrung together, 2) mechanically held togethzr in compression, and 3) bonded using adhesive layers which are thin compared to the thicknesses of the substrates and the wavelength of the interface waves. Additionally, interface wave attenuation with propagation distance has been measured for variations in surface roughness induced on the surface of one of the substrates prior to adhesive bonding. All of these measurements suggest potential applications of interface wave techniques in the nondestructive evaluation of bonded structural components.
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