NONLINEAR SHEAR SURFACE-WAVES AT INTERFACES AND PLANAR DEFECTS OF CRYSTALS

An exact solution has been constructed for the equations of nonlinear elasticity theory, describing monochromatic shear surface waves, supported by the interface between a uniaxial nonlinear crystal and a layer of a "linear" crystal of arbitrary thickness, and by the interface between a nonlinear crystal and another nonlinear crystal (both semi-infinite and in the form of a thin layer). We consider the propagation of surface waves in which the maximum of the amplitude is located at a finite depth under the boundary of the nonlinear self-focusing crystal. Shear surface waves not existing in linear theory are predicted at the interface between two semi-infinite crystals and at the interface betwwen a nonlinear crystal and an "accelerating" elastic layer. In particular, nonlinear shear surface waves with vanishingly small amplitude at the interface are described. © 1990.