GROUP-VELOCITY FORMULAS FOR THE SYMMETRY PLANES OF A STRESSED ANISOTROPIC ELASTIC SOLID

This paper presents analytic formulas for the group velocity of quasil ongitudinal, quasitransverse, and shear-horizontally (SH) polarized pu re-transverse modes propagating in an arbitrary direction on the symme try planes of a stressed anisotropic elastic medium with orthotropic o r higher symmetry. The group velocity equations are expressed in terms of the thermodynamic elastic stiffness coefficients and stresses acti ng on the medium. An example is provided with a (001) silicon crystal compressed at uniaxial stress. (C) 1997 Acoustical Society of America. [S0001-4966(97)00511-0].