Elastic wave propagation in circumferential direction in anisotropic pipes

S. Towfighi, T. Kundu, M. Ehsani

Research output: Contribution to conferencePaperpeer-review

1 Scopus citations


Ultrasonic nondestructive inspection of large diameter pipes is important for health monitoring of ailing infrastructure. Longitudinal stress-corrosion cracks are detected more efficiently by inducing circumferential waves; hence, the study of elastic wave propagation in the circumferential direction of a pipe is essential. The current state of knowledge lacks a complete solution of this problem. Only when the pipe material is isotropic a solution of the wave propagation problem in the circumferential direction exists. Ultrasonic inspections of reinforced concrete pipes and pipes retrofitted by fiber composites necessitate the development of a new theoretical solution for elastic wave propagation in anisotropic pipes in the circumferential direction. Mathematical modeling of the problem to obtain dispersion curves for anisotropic materials leads to coupled differential equations. Unlike isotropic materials for which the Stokes-Helmholtz decomposition technique simplifies the problem, in anisotropic case no such general decomposition technique works. These coupled differential equations are solved in this paper. Dispersion curves for anisotropic pipes of different curvatures have been computed and presented. Some numerical results computed by the new technique have been compared with those available in the literature.

Original languageEnglish (US)
Number of pages8
StatePublished - 2001
Event2001 ASME International Mechanical Engineering Congress and Exposition - New York, NY, United States
Duration: Nov 11 2001Nov 16 2001


Other2001 ASME International Mechanical Engineering Congress and Exposition
Country/TerritoryUnited States
CityNew York, NY

ASJC Scopus subject areas

  • Mechanical Engineering


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