Abstract
Reflection coefficients of ultrasonic longitudinal and transverse waves at a contacting interface between aluminum blocks were measured at different contact pressures. From the measured reflection coefficients, the normal and tangential stiffnesses were obtained as functions of the frequency as well as the contact pressure. These stiffnesses were found to increase both with the frequency and the contact pressure. The frequency dependence of the tangential stiffness was found to be consistent with the corresponding result obtained from the interface wave velocity measurement. Furthermore, the ratio of normal and tangential stiffnesses was found to be dependent on the frequency, while it was only weakly dependent on the contact pressure.
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