Wave characteristics in magneto-electro-elastic laminated composites with different layering directions

We compare the dispersion curves and mode shapes in magneto-electro-elastic laminated composites with different layering directions. We use the generalized pseudo-Stroh formulation and propagator matrix approach to investigate the wave characteristics of the piezoelectric and piezomagnetic laminates with the layering direction either along y-axis or z-axis. The polarization direction of the piezoelectric and piezomagnetic materials [001] is along z-axis. In particular, both BaTiO₃/CoFe₂O₄/BaTiO₃ and BaTiO₃/Terfenol-D/BaTiO₃ sandwich composites are considered in the numerical example and the wave characteristics of the Lamb wave and SH wave are computed. Differences of the dispersion curves and the mode shapes of the sandwich plates show the important role of the layering direction. The decoupling feature of the Lamb wave and SH wave is consistent with that of the static case if the layering direction is along y-axis, but different from the static case when the layering direction is along z-axis.