Abstract
In this paper, a model of elastic rod surrounded by porous media and a model of porous rod surrounded by elastic media are built. Based on the elastic-dynamic theory of liquid-saturated porous solid and numerical computation, the dispersion characteristic of guided waves in this structure with different cylinder radius and porous media parameters are discussed. Results show that the longitudinal guided wave propagation in this structure is dispersive and influenced by the radius of the rod and porosity of the porous media. It suggests that the dispersion curve of L (0,1) shifts to lower frequency with increasing rod radius.The dispersion is mainly influenced by the propertiesof internal rod. When the internal rod is porous media,the dispersion curves of guided waves gradually shift to low speed with the increasing porosity. The static permeability has little effect on dispersion.All these results can provide a theoretical reference for the non-destructive evaluation to the structure of a solid rod surrounded by infinite media.
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