Nonlinear surface acoustic waves in crystals

A theory for nonlinear surface acoustic waves in isotropic solids [E. A. Za bolotskaya, J. Acoust. Sec. Am. 91, 2569-2575 (1992)] is generalized to inc lude the anisotropy of crystals. There is no restriction to material symmet ry, orientation of the free surface with respect to crystal axes, or propag ation direction in the plane of the free surface. Numerical simulations of waveform distortion, shock formation, and harmonic propagation curves are p resented for two different cuts of potassium chloride. (C) 1999 Acoustical Society of America. [S0001-4966(99)02802-7].