The behaviour of elastic surface waves polarized in a plane of material symmetry. III. Orthorhombic and cubic media

The results obtained in part II for symmetric elastic surface waves in monoclinic media are specialized first to orthorhombic, then to cubic symmetry. A complete account is given of the configurations in which the S-tensors, and hence the surface-wave function and the secular equation, can be determined explicitly. The theoretical developments are complemented by extensive numerical computations, presented in the context of elastodynamic classifications of orthorhombic and cubic materials evolved by Musgrave and Chadwick & Smith respectively. The transitions between subsonic and supersonic surface-wave propagation encountered in part II recur in considerable abundance, but stand in a clear relationship to the classification only in the case of cubic media.

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