Thin plate wave modulus

Thin plate wave modulus (plane strain or two-dimensional Young modulus)... 

The difference between a specimen that is effectively a semi-infinite halfspace and one that has a boundary at a finite depth is illustrated in the V(z) curves of two glass specimens in Fig. 10.7. The dashed curve is V(z) for a microscope slide 2 mm thick. The solid curve is V(z) for a glass cover-slip 0.11 mm thick. In a thin plate such as a cover-slip Lamb waves can be excited (Auld 1973). At low frequencies the lowest-order symmetric mode is like a longitudinal wave, except that, because the plate is thin, the modulus governing the velocity is cn — c2n/cn (Table 6.1). If the frequency is increased until... 

For a viscoelastic material both K and G are complex quantities. When the material sample has finite dimensions other modes of wave propagation may occur as a result of multiple scattering from the material boundaries. Mode conversion from longitudinal wave to shear wave, and vice versa, occurs on reflection at a solid boundary. For material samples in the form of thin rods or plates the modes of wave propagation are extenional waves (with speed determined by the Young s modulus, or the plate modulus), and flexural (bending) waves [8]. 

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See also in sourсe #XX -- [ ]

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