An analysis is presented for the propagation of free harmonic waves in fluid-conveying, thin-walled, circular cylindrical shells of orthotropic material. The shell motion is modeled by using the dynamic orthotropic version of Love’s first-approximation linear shell theory and the fluid forces are described by applying linear potential flow theory. Frequency spectra are presented for both axisymmetric and unsymmetric types of modes, using an exact solution. Also, simplified approximate expressions are presented for some cases of practical importance. Emphasis is placed upon the difference between the behavior of pipe constructed of fiberglass-epoxy composite material and that of steel pipe.

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