Vol 66, No 1 (2014)

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Existence of zero-group velocity modes in an incompressible plate

T. Hussain, F. Ahmad

Arch. Mech. 66 (1), 55-65, 2014

Keywords: Lamb modes; anisotropy; zero-group velocity points.


Abstract


Zero-group velocity (ZGV) Lamb modes are studied in an incompressible orthotropic plate. The existence of such modes critically depends on the anisotropy parameter a = (c11 + c22 − 2c12 − 4c66)/c66. With materials having a > −1, none of the modes possesses any ZGV points and every mode has such a point if a < −1. Several modes have multiple ZGV points.

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