Abstract
Pulsed 2.1-MHz leaky waves on an adhesively bonded titanium-aluminum interface have been generated and detected by aluminum Rayleigh wave mode conversion. Specimens were prepared by bonding 0.95-cm × 1.27-cm etched titanium alloy bars to large aluminum substrates and compressing so the thickness of the adhesive layer was much smaller than the acoustic wavelength. Total losses of less than 12 dB due to mode conversion and attenuation along the 1.27-cm interface have been observed. The adhesive bond geometry is modeled as a liquid layer of thickness H separating two isotropic solid half-spaces [A. R. Banghar, G. S. Murty, and I. V. V. Raghavacharyulu, J. Acoust. Soc. Am. 60, 1071–1078 (1976)]. Measured leaky wave velocity is approximately predicted by the case where H approaches zero and the viscosity of the liquid becomes large [D. A. Lee and D. M. Corbly, IEEE Trans. Sunics Ultrason. SU-24, 206–212 (1977)]. Particle displacements near the boundary in both the titanium and the aluminum are derived for this case and changes in leaky wave attenuation due to small variations in H are predicted. [Work partially supported by NSF.]
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