Controlled Dispersion of the Extensional Wave in Composite Isotropic and Transversely Isotropic Rods.
NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV RI
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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
- Laminates and Composite Materials
- Elastomers and Rubber