RAYLEIGH-LAMB WAVE PROPAGATION IN ANISTOTROPIC MEDIA.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
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The stiffness matrix relating stress to strain in the generalized Hookes Law can, for anisotropic materials, be written in terms of the isotropic matrix plus a set of perturbation terms. This matrix and the Rayleigh-Lamb displacement field are used to determine special forms of the equilibrium equations for anisotropic Rayleigh-Lamb waves. The forms of anisotropy were restricted to the hexagonal, orthorhombic, cubic, and tetragonal crystal classes, and a frequency equation which is an anisotropic analog to the equation published by Lamb in 1917 was developed for these materials. Perturbation effects on the frequency equations were then examined. Author
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