Propagation and scattering of elastic waves in laminated circular cylinders

Propagation and scattering of guided elastic waves in circular cylinders are investigated. An analytical method is formulated to study wave propagation in laminated isotropic cylinders while Rayleigh-Ritz type approximations are developed for laminated composite cylinders where the analytical solutions are unattainable. The effects of circumferential wavenumber, thickness to radius ratio, ply lay-up configuration, and layering on dispersion characteristics of free guided waves are investigated through these techniques.;The problem of reflection of waves normally incident upon the free end of cylinders is studied as a special case of wave scattering problems. A wave functions expansion procedure is employed in developing least square and variational methods for the investigation. Numerical results demonstrate the successful application of the Rayleigh Ritz type approximation and the variational technique for the free end reflection problem in laminated composite cylinders.;A hybrid method is presented to analyse the scattering of plane strain waves by load or flaw in cylindrical cross-section. The domain of the cross-section is divided into two regions, an interior region and an exterior region. The interior region which contains the load or flaw is modelled by finite elements while a wave functions expansion is employed for the exterior region. The numerical results for the scattered amplitudes from the load and from flaw are presented for Zr-Nb pressure tube.