Theoretical aspects of applying Lamb waves to nondestructive testing of layered anisotropic media are considered. Propagation of Lamb waves is analyzed using a six-dimensional complex Cauchy formalism that allows one to obtain a closed-form equation for determining the dispersion of Lamb waves in media with arbitrary elastic anisotropy. The possibility for applying the higher modes of Lamb waves to nondestructive testing is noted.
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Ilyashenko et al. (2017) studied this question.
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