Accession Number : ADA301833

Title :   Controlled Dispersion of the Extensional Wave in Composite Isotropic and Transversely Isotropic Rods.

Descriptive Note : Final rept.,

Corporate Author : NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV RI

Personal Author(s) : Berliner, Marilyn J.

PDF Url : ADA301833

Report Date : 14 AUG 1995

Pagination or Media Count : 52

Abstract : The dispersion of extensional waves in composite isotropic and transversely isotropic rods is investigated. The equations of motion of an infinitely long, layered rod with a transversely isotropic core and transversely isotropic casing are developed using the three-dimensional equations of elasticity. Simplifications to the equations of motion for axisymmetric modes of wave propagation and for material isotropy are presented. Methodologies for controlling the range of dispersion or the maximum phase velocity of extensional waves in composite rods consisting of an isotropic core and isotropic casing are discussed. A model of the maximum phase velocity of the extensional wave in a rod consisting of an isotropic core and transversely isotropic casing is developed. It is found that the maximum phase velocity of this system can be controlled within two bounding velocities. The frequency spectra of the extensional waves for several cases are developed, and the dispersion characteristics are discussed. (MM)

Descriptors :   *COMPOSITE MATERIALS, *RUBBER, VELOCITY, EQUATIONS OF MOTION, DISPLACEMENT, FIBER REINFORCED COMPOSITES, ELASTIC PROPERTIES, COMPOSITE STRUCTURES, WAVE PROPAGATION, BOUNDARY VALUE PROBLEMS, ISOTROPISM, AXISYMMETRIC, RODS, TRANSVERSE, SILICA GLASS.

Subject Categories : Laminates and Composite Materials
      Elastomers and Rubber

Distribution Statement : APPROVED FOR PUBLIC RELEASE