The Propagation of Torsional Guided Wave in Oil-Filledand Viscoelastic Coating Pipe Surrounded by Water

In this paper, the propagation of torsional guided wave in oil-filled and viscoelastic coating pipes surrounded with water loading has been investigated by numerical and experimental analysis. It is essential to understand how the guided waves travel in benthal pipes in order to monitor/inspect their health statues. Firstly, the paper describes dispersion characteristics for torsional wave by dispersion curves. Secondly, checks up the result of numerical analysis by a series of experimental study. And the effects of viscoelastic material on dispersion of guided wave have been elaborated without considering the shear action because the effect of oil and water are neglected. The result presented in this paper is useful for designing damage detection schemes of pipe-like structures.