Fundamental modes of new dispersive SH-waves in piezoelectromagnetic plate

Abstract

Fundamental modes of new dispersive shear-horizontal (SH) acoustic waves propagating in the (6 mm) piezoelectromagnetic plate are studied. These SH-waves can propagate when the following boundary conditions are exploited for both the upper and lower surfaces of the plate: (1) when the surfaces are mechanically free, electrically and magnetically closed and (2) when the surfaces are mechanically free, electrically and magnetically open. The SH-waves depend on the electromagnetic wave speed \(V_{\rm EM} =1/ {\sqrt {(\varepsilon\mu)}}\) and can only exist when the electromagnetic constant \(\alpha \ne 0\). The calculations (first evidence) were performed for the PZT-5H–Terfenol-D which is a composite with a large value of α. The limit cases of large values of α (α2 = 0.5eμ, α2 = 0.9eμ, and α2 = 0.99eμ) are studied because they satisfy the limitation condition of α2 < eμ.