Аннотация:The processes on the boundary of two contacting flat bodies are one of the main mechanisms of structural acoustical nonlinearity. The impact of this nonlinearity could be
much higher than the impact of classical nonlinearity in solids. The presence of inhomogeneities on the boundary of two surfaces brings a significant change in nonlinear
elastic properties of the studied structures. The goal of this study is understanding how the roughness of the boundary of two solids surfaces effects their nonlinear elastic
properties and the possible usage of these results for the solid state surface diagnostic.