Abstract
The results of experimental studies on the nonlinear elastic properties of a planar interface between two media are presented—an optically polished glass substrate and flat samples with different degrees of roughness. The nonlinear elastic properties of the interfaces between two media were investigated by the spectral method using surface acoustic waves (SAWs). The effect of external pressure applied to the interface on the efficiency of the generation of the second SAW harmonic was studied. Using the measured amplitudes of the first and second harmonics of the SAW that passes along the interface, the second-order nonlinear acoustic parameter was calculated as a function of the external pressure applied to the sample at a fixed amplitude of a probing wave. It was revealed that the nonlinear parameter of the SAW is a nonmonotonic function of the pressure at the boundary. The results were analyzed on the basis of an elastic contact nonlinearity, and it is concluded that these results can be used in nondestructive testing for roughness and waviness of surfaces of flat solids.
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Original Russian Text © A.I. Kokshaiskii, A.I. Korobov, N.V. Shirgina, 2017, published in Akusticheskii Zhurnal, 2017, Vol. 63, No. 2, pp. 152–157.
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Kokshaiskii, A.I., Korobov, A.I. & Shirgina, N.V. Diagnostics of elastic properties of a planar interface between two rough media using surface acoustic waves. Acoust. Phys. 63, 154–158 (2017). https://doi.org/10.1134/S1063771017010031
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DOI: https://doi.org/10.1134/S1063771017010031