Accession Number : ADP002508

Title :   Stress Induced Effects on the Propagation of Surface Waves,


Personal Author(s) : Sinha,B. K. ; Tanski,W. J. ; Lukaszek,T. ; Ballato,A.

Report Date : 1983

Pagination or Media Count : 8

Abstract : It is known that the propagation characteristics of elastic waves are influenced by the nature of biasing stress distributions in the propagating medium. A knowledge of the magnitude of such effects plays an important role in improving the performance and long term aging characteristics of SAW devices. Generally, SAW devices employ thin plate-like structures as the propagating medium of surface waves. The biasing deformation of such structures due to externally applied forces can be decomposed into extensional and flexural deformations which can have substantially different effects on the change in the time delay between two observation points. This paper describes a study of the fractional change in the time delay of surface waves due to the stress components in terms of which a general deformation can be expressed. The information on the biasing state of thin discs has been employed in a previously reported perturbation procedure for equations of motion for small dynamic fields superposed on a static bias.

Descriptors :   *Acoustic waves, *Surface waves, *Wave propagation, Stresses, Piezoelectric crystals, Quartz, Elastic properties

Distribution Statement : APPROVED FOR PUBLIC RELEASE