Transmission of oscillations through a layer of a nonlinear elastic medium

ISSN： 1063-7710

Source： Acoustical Physics, Vol.56, Iss.6, 2010-11, pp. : 893-903

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Abstract

The transmission of shear one-dimensional periodic perturbations through a layer of a nonlinearly elastic medium under the conditions close to resonance is considered. The layer separates two half-spaces consisting of a medium that is much more rigid, as compared to the medium in the layer. A system of differential equations is obtained for describing the slow variations in the amplitude and waveform of nonlinear strain and stress oscillations at the fixed boundary that occur because of the nonlinear properties of the medium while the other boundary performs arbitrary periodic motions in its plane. The period of these oscillations is close to the period of natural oscillations of the layer. It is shown that, in addition to continuous strain variations at the fixed boundary, strain variations containing strong discontinuities are possible. Relations at the discontinuities are obtained. The analogy between the equations derived for the case under study and the equations describing the propagation of strain waves in a homogeneous anisotropic elastic medium is pointed out.