Effect of elastic modulus and poisson's ratio on guided wave dispersion using transversely isotropic material modelling

Subhani, Mahbube, Li, Jianchun, Gravenkamp, Hauke and Samali, Bijan 2013, Effect of elastic modulus and poisson's ratio on guided wave dispersion using transversely isotropic material modelling, Advanced materials research, vol. 778, pp. 303-311, doi: 10.4028/www.scientific.net/AMR.778.303.

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Title Effect of elastic modulus and poisson's ratio on guided wave dispersion using transversely isotropic material modelling
Author(s) Subhani, MahbubeORCID iD for Subhani, Mahbube orcid.org/0000-0001-9565-3271
Li, Jianchun
Gravenkamp, Hauke
Samali, Bijan
Journal name Advanced materials research
Volume number 778
Start page 303
End page 311
Total pages 9
Publisher Trans Tech Publications Ltd.
Place of publication Pfaffikon, Switzerland
Publication date 2013
ISSN 1022-6680
Keyword(s) dispersion curves
guided wave
orthotropic material
transversely isotropic material
Summary Timber poles are commonly used for telecommunication and power distribution networks, wharves or jetties, piling or as a substructure of short span bridges. Most of the available techniques currently used for non-destructive testing (NDT) of timber structures are based on one-dimensional wave theory. If it is essential to detect small sized damage, it becomes necessary to consider guided wave (GW) propagation as the behaviour of different propagating modes cannot be represented by one-dimensional approximations. However, due to the orthotropic material properties of timber, the modelling of guided waves can be complex. No analytical solution can be found for plotting dispersion curves for orthotropic thick cylindrical waveguides even though very few literatures can be found on the theory of GW for anisotropic cylindrical waveguide. In addition, purely numerical approaches are available for solving these curves. In this paper, dispersion curves for orthotropic cylinders are computed using the scaled boundary finite element method (SBFEM) and compared with an isotropic material model to indicate the importance of considering timber as an anisotropic material. Moreover, some simplification is made on orthotropic behaviour of timber to make it transversely isotropic due to the fact that, analytical approaches for transversely isotropic cylinder are widely available in the literature. Also, the applicability of considering timber as a transversely isotropic material is discussed. As an orthotropic material, most material testing results of timber found in the literature include 9 elastic constants (three elastic moduli and six Poisson's ratios), hence it is essential to select the appropriate material properties for transversely isotropic material which includes only 5 elastic constants. Therefore, comparison between orthotropic and transversely isotropic material model is also presented in this article to reveal the effect of elastic moduli and Poisson's ratios on dispersion curves. Based on this study, some suggestions are proposed on selecting the parameters from an orthotropic model to transversely isotropic condition.
Language eng
DOI 10.4028/www.scientific.net/AMR.778.303
Field of Research 090505 Infrastructure Engineering and Asset Management
090506 Structural Engineering
Socio Economic Objective 870201 Civil Construction Design
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2013, Trans Tech Publications, Switzerland
Persistent URL http://hdl.handle.net/10536/DRO/DU:30068007

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