scholarly journals Analytical Investigation of Surface Wave Characteristics of Piezoelectromagnetics of Class 6 mm

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Aleksey A. Zakharenko
Keyword(s):  
Surface Wave ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Transversely Isotropic ◽  
Analytical Investigation ◽  
Wave Characteristics ◽  
Surface Wave Propagation ◽  
Theoretical Investigations ◽  
Derivatives Of ◽  
Shear Horizontal

This short work copes with theoretical investigations of some surface wave characteristics for transversely isotropic piezoelectromagnetic composites of class 6 mm. In the composite materials, the surface Bleustein-Gulyaev-Melkumyan wave and some new shear-horizontal surface acoustic waves (SH-SAWs) recently discovered by the author can propagate. The phase velocities of the SH-SAWs can have complicated dependencies on the coefficient of the magnetoelectromechanical coupling (CMEMC) which depends on the electromagnetic constant of the composites. Therefore, the analytical finding of the first and second partial derivatives of the represents the main purpose of this study. It is thought that the results of this short letter can help for theoreticians and experimentalists working in the research arena of opto-acoustoelectronics to completely understand some problems of surface wave propagation in piezoelectromagnetics.

scholarly journals On Discovery of the Twelfth and Thirteenth New Nondispersive SH-SAWs in 6 mm Magnetoelectroelastics

Acoustics ◽  
2019 ◽  
Vol 1 (4) ◽  
pp. 749-762
Author(s):  
Zakharenko
Keyword(s):  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Normal Component ◽  
Transversely Isotropic ◽  
Coupling Mechanism ◽  
Sh Waves ◽  
Magnetoelectroelastic Materials ◽  
Open Case ◽  
Coupling Mechanisms ◽  
Shear Horizontal

This report acquaints the reader with an extra two new shear-horizontal surface acoustic waves (SH-SAWs). These new SH-SAWs can propagate along the free surface of the transversely isotropic (6 mm) magnetoelectroelastic materials. These (composite) materials can simultaneously possess the piezoelectric, piezomagnetic, and magnetoelectric effects. Some competition among these effects can lead to suitable solutions found for the following three possible coupling mechanisms: eα – hε, eµ – hα, εµ – α2. Here, the mechanically free interface between the solid and a vacuum was considered. This report discovers the twelfth (thirteenth) new SH-SAW for the magnetically closed (electrically open) case and continuity of both the normal component of the electrical (magnetic) displacement and the electrical (magnetic) potential when the coupling mechanism eα – hε (eµ – hα) works. The propagation velocities were obtained in explicit forms that take into account the contribution of the vacuum material parameters. The discovered waves were then graphically studied for the purpose of disclosing the dissipation phenomenon (the propagation velocity becomes imaginary) caused by the coupling with the vacuum properties. The obtained results can be useful for further investigations of interfacial and plate SH-waves, constitution of technical devices, nondestructive testing and evaluation, and application of some gravitational phenomena.

Existence and spectral properties of shear horizontal surface acoustic waves in vertically periodic half-spaces

2009 ◽  
Vol 465 (2105) ◽  
pp. 1489-1511 ◽  
Author(s):  
A.L. Shuvalov ◽  
O. Poncelet ◽  
S.V. Golkin
Keyword(s):  
Material Properties ◽  
Acoustic Waves ◽  
Spectral Properties ◽  
Surface Acoustic Waves ◽  
Homogeneous Boundary Condition ◽  
Horizontal Surface ◽  
Infinite Strip ◽  
Discrete Variation ◽  
Time Space ◽  
Shear Horizontal

The paper is concerned with the propagation of shear horizontal surface waves (SHSW) in semi-infinite elastic media with vertically periodic continuous and/or discrete variation of material properties. The existence and spectral properties of the SHSW are shown to be intimately related to the shape of the properties variation profile. Generally, the SHSW dispersion branches represent randomly broken spectral intervals on the ( ω ,  k ) plane. They may, however, display a particular regularity in being confined to certain distinct ranges of slowness s = ω / k , which can be predicted and estimated directly from the profile shape. The SHSW spectral regularity is especially prominent when the material properties at the opposite edge points of a period are different. In particular, a unit cell can be arranged so that the SHSW exists within a single slowness window, narrow in the measure of material contrast between the edges, and does not exist elsewhere or vice versa. Explicit analysis in the ( ω ,  k ) domain is complemented and verified through the numerical simulation of the SH wave field in the time–space domain. The results also apply to a longitudinally periodic semi-infinite strip with a homogeneous boundary condition at the faces.

Surface acoustic waves in piezocrystals: an example of surface wave existence with clamped boundary

Wave Motion ◽  
1994 ◽  
Vol 19 (2) ◽  
pp. 113-123 ◽  
Author(s):  
V.I. Alshits ◽  
A.N. Darinskii ◽  
J. Lothe ◽  
V.I. Lyubimov
Keyword(s):  
Surface Wave ◽  
Acoustic Waves ◽  
Surface Acoustic Waves

Surface Wave Propagation in Thin Silver Films under Residual Stress

2002 ◽  
Vol 57 (1-2) ◽  
pp. 58-64
Author(s):  
A. Njeh ◽  
D. Schneider ◽  
H. Fuess ◽  
M. H. Ben Ghozlen
Keyword(s):  
Residual Stresses ◽  
Phase Velocity ◽  
Surface Waves ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Dispersion Curves ◽  
Silver Films ◽  
Surface Wave Propagation ◽  
Relative Change ◽  
Good Agreement

Investigations using surface acoustic waves provide information on the elastic properties of thin films. Residual stresses change the phase velocity of the surface waves. We have calculated the phase velocity and dispersion of surface waves in thin silver films with a strong [111]-fibre texture. A non-linear description of surface waves propagating along the [110]-direction of the substrate has been developed on the basis of an acoustoelastic theory, taking into account residual stresses. The relative change Δc/c of the velocity v was found to be linear for large excitation frequencies. The dispersion curves were measured using a photoacoustic method. For sputtered polycrystalline thin silver films we found good agreement between the experimental and calculated dispersion curves for frequencies up to 225 MHz

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