Accession Number : AD0702053

Title :   WAVE PROPAGATION IN THREE-LAYERED PLATES. APPLICATION TO ULTRASONIC DELAY LINES.

Descriptive Note : Research rept.,

Corporate Author : POLYTECHNIC INST OF BROOKLYN N Y DEPT OF AEROSPACE ENGINEERING AND APPLIED MECHANICS

Personal Author(s) : Armenakas,Anthony E. ; Keck,Henry E.

Report Date : FEB 1970

Pagination or Media Count : 37

Abstract : The propagation of trains of straight crested harmonic waves in infinitely long isotropic, traction free, three-layered plates is investigated on the basis of the three-dimensional linear theory of elasticity. It is established, that as in the case of waves traveling in homogeneous plates, the face shear motion and the longitudinal - flexural motion exist uncoupled. However, independent symmetric and antisymmetric modes exist only in the case of three-layered symmetric plates; that is, plates having identical outer layers. The frequency equations have been evaluated numerically. The possibility is discussed of utilizing thin three-layered symmetric strings as delay media in guided wave ultrasonic delay lines having a linear delay versus frequency relation. (Author)

Descriptors :   (*DELAY LINES, WAVE PROPAGATION), (*SHEETS, WAVE PROPAGATION), ULTRASONIC RADIATION, SANDWICH CONSTRUCTION, ELASTIC PROPERTIES, PROPAGATION

Subject Categories : Electrical and Electronic Equipment
      Acoustics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE