Dispersion relations of waves in a rod embedded in an elastic medium

R. Parnes*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The dispersion relations of waves propagating in a system consisting of an elastic rod of radius a embedded in a linear elastic medium are investigated, and phase speeds of waves of wavelength λ which propagate under steady state conditions are determined. The dispersive behaviour is found to be dependent on several non-dimensional parameters defined by the geometric ratio a λ, as well as on non-dimensional ratios of the rod-medium properties. It is shown that the resulting waves which can propagate under steady state conditions are surface waves which decay with the radial distance and which permit no radiation damping of energy. It is further shown that such waves can propagate freely only if the propagation speed of longitudinal waves in the corresponding free rod is less than that of shear waves propagating in the medium. Results are presented by means of dispersion curves and surfaces. From a study of the analytical results obtained, lower and upper bounds on the phase speeds are established.

Original languageEnglish
Pages (from-to)65-75
Number of pages11
JournalJournal of Sound and Vibration
Issue number1
StatePublished - 8 May 1981


FundersFunder number
Ecole Polytechnique
National Science Foundation78-15049


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