Abstract
Two additional criteria for the existence of cusp points on elastic wave surfaces are developed.
A previously published method [1] is extended to give a simple necessary and sufficient condition for cusps about (1, 1, 0) axes in cubic and tetragonal media. This criterion is plausibly adapted to provide a simple inequality applicable to any section of slowness surface represented by separable quadratic and quartic equations.
Two tables of numerical examples are presented.
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Musgrave, M.J.P. Further criteria for elastic waves in anisotropic media. J Elasticity 9, 105–112 (1979). https://doi.org/10.1007/BF00040985
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DOI: https://doi.org/10.1007/BF00040985