Abstract
A homogeneous, isotropic elastic medium having initial axial stresses in two orthogonal directions is considered. The dynamic equations for superimposed small deformations are stated. The propagation of plane waves in such a medium is discussed. It is shown that pure longitudinal and shear waves can propagate only in certain specific directions which are defined. The present analysis corrects a fundamental error in a recent paper in this Journal [J. Acoust. Soc. Am. 72, 255–263 (1982)].
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