Elastic waves trapped by a homogeneous anisotropic semicylinder

S. A. Nazarov

Sbornik. Mathematics, Tome 204 (2013) no. 11, pp. 1639-1670

Résumé

It is established that the problem of elastic oscillations of a homogeneous anisotropic semicylinder (console) with traction-free lateral surface (Neumann boundary condition) has no eigenvalues when the console is clamped at one end (Dirichlet boundary condition). If the end is free, under additional requirements of elastic and geometric symmetry, simple sufficient conditions are found for the existence of an eigenvalue embedded in the continuous spectrum and generating a trapped elastic wave, that is, one which decays at infinity at an exponential rate. The results are obtained by generalizing the methods developed for scalar problems, which however require substantial modification for the vector problem in elasticity theory. Examples are given and open questions are stated. Bibliography: 53 titles.

Détail

Keywords: homogeneous anisotropic semicylinder, trapped waves, point spectrum on the continuous spectrum, artificial boundary conditions.

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