TITLE:
Investigation of SH-Wave Fundamental Modes in Piezoelectromagnetic Plate: Electrically Closed and Magnetically Closed Boundary Conditions
AUTHORS:
Aaleksey Anatolievich Zakharenko
KEYWORDS:
Piezoelectromagnetics, Magnetoelectric Effect, Acoustic SH-Waves in Plates, Wave Dispersion
JOURNAL NAME:
Open Journal of Acoustics,
Vol.4 No.2,
June
18,
2014
ABSTRACT: It is theoretically considered the propagation (first evidence) of new
dispersive shear-horizontal (SH) acoustic waves in the piezoelectromagnetic
(magnetoelectroelastic) composite plates. The studied two-phase composites
(BaTiO3-CoFe2O4 and PZT-5H-Terfenol-D) possess
the piezoelectric phase (BaTiO3, PZT-5H) and the piezomagnetic phase
(CoFe2O4, Terfenol-D). The mechanical, electrical, and
magnetic boundary conditions applied to both the upper and lower free surfaces
of the plate are as follows: the mechanically free, electrically closed, and
magnetically closed surfaces. As a result, the fundamental modes of two new
dispersive SH-waves recently discovered in book [Zakharenko, A.A. (2012) ISBN:
978-3-659-30943-4] were numerically calculated. It was found that for large
values of normalized plate thickness kd (k and d are the wavenumber and plate
half-thickness, respectively) the velocities of both the new dispersive
SH-waves can approach the nondispersive SH-SAW velocity of the
piezoelectric exchange surface Melkumyan (PEESM) wave. It was also discussed
that for small values of kd, the
experimental study of the new dispersive SH-waves can be preferable in
comparison with the nondispersive PEESM wave. The obtained results can be
constructive for creation of various technical devices based on (non)dispersive
SH-waves and two-phase smart materials. The new dispersive SH-waves propagating
in the plates can be also employed for nondestructive testing and evaluation. Also,
it is obvious that the plates can be used in technical devices instead of the
corresponding bulk samples for further miniaturization.