Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
800814 | Mechanics Research Communications | 2015 | 6 Pages |
•We use a new approach where polarization depends on macro and micro-deformations.•Consequences of dipole, quadrupole and electric field on acoustic modes are new.•Coupling of modes are easily described adopting a simple micropolar model.•Attenuation and frequency cutoff are shown to depend on the electric field.
A recent electro-magneto-elastic extension of microcontinuum elasticity is exploited to estimate the consequences of electro-elastic interactions, due to intrinsic polarization in ferroelectrics, on the propagation of acoustic modes. The model is applied and compared to a micromechanical analysis of perovskite-like structures developed in the past and reducible to a micropolar continuum model. Qualitative and quantitative effects due to electric dipole and quadrupole densities are discussed concerning phase speeds, cutoff frequencies and attenuation.