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A comparative study of guided wave propagation in timber poles with isotropic and transversely isotropic material models

Subhani, Mahbube, Li, Jianchun and Samali, Bijan 2013, A comparative study of guided wave propagation in timber poles with isotropic and transversely isotropic material models, Journal of civil structural health monitoring, vol. 3, no. 2, pp. 65-79, doi: 10.1007/s13349-012-0032-1.

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Title A comparative study of guided wave propagation in timber poles with isotropic and transversely isotropic material models
Author(s) Subhani, MahbubeORCID iD for Subhani, Mahbube orcid.org/0000-0001-9565-3271
Li, Jianchun
Samali, Bijan
Journal name Journal of civil structural health monitoring
Volume number 3
Issue number 2
Start page 65
End page 79
Total pages 15
Publisher Springer
Place of publication Berlin, Germany
Publication date 2013-05
ISSN 2190-5452
2190-5479
Keyword(s) dispersion curves
guided wave
NDT
timber
transversely isotropic material model
utility pole
Summary Guided wave (GW) has been used for many years in non-destructive testing (NDT). There are various ways to generate the guided wave, including impact or impulse either manually or using devices. Although the method of impact or impulse is considered to be simple and practical in guided wave generation, it produces waves with broadband frequencies, which often make analysis much more difficult. The frequency bandwidth produced by manual impacts is usually at the low end, and is therefore justified when dealing with one dimensional wave propagation assumption in low strain integrity testing of cylindrical structures. Under such assumption if the velocity is known accurately, NDTs can produce reasonably good results for the condition assessment of the structure. However, for guided wave propagation in timber pole-like structures, it is rather complicated as timber is an orthotropic material and wave propagation in an orthotropic medium exhibits different characteristics from that in isotropic medium. It is possible to obtain solutions for guided wave propagation in orthotropic media for cylindrical structures, even though the orthotropic material greatly complicates GW propagation. In this paper, timber has been considered as a transversely isotropic (i.e. simplified orthotropic) material and a comparative study of GW propagation in a timber pole is conducted considering isotropic and transversely isotropic modelling. Phase velocity, group velocity and attenuation are the main parameters for this comparative study. Moreover, tractionfree situation and embedded geotechnical condition are also taken into consideration to evaluate the effect of boundary. Displacement profile, wave propagation pattern and power flow at particular frequency are utilized to determine different displacement components of longitudinal and flexural waves along and across the timber pole. Effect of temperature and moisture content (in terms of modulus of elasticity) in timber pole is also compared to show the variation in phase velocity.
Language eng
DOI 10.1007/s13349-012-0032-1
Field of Research 090505 Infrastructure Engineering and Asset Management
090506 Structural Engineering
Socio Economic Objective 859899 Environmentally Sustainable Energy Activities not elsewhere classified
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2013, Springer-Verlag Heidelberg
Persistent URL http://hdl.handle.net/10536/DRO/DU:30068004

Document type: Journal Article
Collection: School of Engineering
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