The effect of a viscoelastic layer of bitumen on the stress waves propagating in coated pipes is investigated. A recent Spectral Finite Element (SFE) formulation, capable to account for viscoelastic media, is used to formulate the wave equation and to extract the dispersive attenuation and energy velocity properties of the existing waves. Dispersion curves are next obtained by representing these features at several frequencies. A scheduled 4.in-40 ANSI coated steel pipe, is used to shown that a slight change of the coating thickness can drastically modify the dispersive patter of the Torsional T(0,1) guided mode, largely used for the inspection of pipelines.
On the Attenuation and Energy Velocity of Torsional Guided Waves in Bitumen Coated Pipes / A. Marzani; E. Viola. - STAMPA. - (2008), pp. 59-63. (Intervento presentato al convegno Second International Conference on Advances and Trends in Engineering Materials and their Applications (AES – ATEMA’ 2008) tenutosi a Cesena, Italy nel September 01 - 05, 2008).
On the Attenuation and Energy Velocity of Torsional Guided Waves in Bitumen Coated Pipes
MARZANI, ALESSANDRO;VIOLA, ERASMO
2008
Abstract
The effect of a viscoelastic layer of bitumen on the stress waves propagating in coated pipes is investigated. A recent Spectral Finite Element (SFE) formulation, capable to account for viscoelastic media, is used to formulate the wave equation and to extract the dispersive attenuation and energy velocity properties of the existing waves. Dispersion curves are next obtained by representing these features at several frequencies. A scheduled 4.in-40 ANSI coated steel pipe, is used to shown that a slight change of the coating thickness can drastically modify the dispersive patter of the Torsional T(0,1) guided mode, largely used for the inspection of pipelines.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
