Effect of initial stress on the propagation behavior of Love waves in a layered piezoelectric structure

• Published in: International journal of solids and structures Vol. 38; no. 1; pp. 37 - 51
• Main Authors: Liu, H., Wang, Z.K., Wang, T.J.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 2001; Elsevier Science
• Subjects: Acoustic wave devices, piezoelectric and piezoresistive devices; Acoustics; Applied sciences; Coupled electromechanical factor; Electronics; Exact sciences and technology; Fundamental areas of phenomenology (including applications); General equipment and techniques; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Layered piezoelectric structure; Love wave; Phase velocity; Physics; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing; Solid mechanics; Stress field; Structural and continuum mechanics; Transduction; acoustical devices for the generation and reproduction of sound; Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...); Vibrations and mechanical waves; Love wave; Layered piezoelectric structure; Phase velocity; Coupled electromechanical factor; Stress field; Acoustic wave device; Stress analysis; Prestress; Measurement sensor; Surface wave; Surface transducer; Modeling; Electromechanical coupling; Piezoelectric ceramics
• ISSN: 0020-7683; 1879-2146
• DOI: 10.1016/S0020-7683(00)00009-3

The propagation behavior of Love waves in a layered piezoelectric structure with an initial stress is investigated in this article. It involves a thin piezoelectric layer bonded perfectly to an elastic substrate. Solutions of the mechanical displacement and electrical potential function are obtained for the piezoelectric layer and elastic substrate by solving the coupled electromechanical field equations. The phase velocity equations of the Love wave propagation and the stress fields in the layered piezoelectric structure are obtained for electrical open and short cases on the free surface, respectively. The effect of the initial stress on the phase velocity, the stress fields and the coupled electromechanical factor are discussed, respectively. Three sets of piezoelectric layer–elastic substrate systems are considered, i.e. BaTiO 3 ceramic layer–borosilicate glass substrate, PZT-5H ceramic layer–borosilicate glass substrate, and PZT-5H ceramic layer–SiO 2 glass substrate. It is seen that the phase velocity of the Love wave propagation decreases with the increase of the magnitude of the initial stress. The coupled electromechanical factor increases remarkably, as the magnitude of the initial the stress is greater than 100 MPa. This is useful for the design of acoustic surface wave devices.