A Pressure Effect on the Nonlinear Reflection of Elastic Waves from the Boundary of Two Solid Mediaстатья
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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
Аннотация:Abstract—Experimental studies of how static pressure affects the features of reflection of a monochromatic longitudinal elastic wave from the boundary of two rough metal surfaces with different interface layers were performed. The following layers were investigated: (a) two flat metal surfaces; (b) two metal surfaces with a layer of 10_μm_thick foil between them; (c) a one_dimensional layer of steel spheres between two metal surfaces; and (d) a one_dimensional layer of steel spheres with 10_μm_thick foil between the spheres and one of the surfaces. Apart from a wave at the fundamental frequency, a second_harmonic wave was observed in the reflected_wave spectrum. The reflected_wave amplitudes depended on the value of the static pressure applied to the layer. It is pointed out that the structural elastic nonlinearity at the solid–layer interface significantly exceeds the elastic nonlinearity related to the anharmonicity of molecular forces in the investigated materials.
Keywords: nonconsolidated granulated media, Hertz contact, generation of elastic harmonics, nonclassical nonlinearity, nonlinear reflection, nonlinear parameter