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Paper Titles
Correlating Visual Grading with NTD Methods for Assessing Timber Condition in Historic Buildings
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Microwave Reflectometric Tool for Non-Destructive Assessment of Decay on Timber Structures
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Development of Radar Apparatus for Scanning of Wooden-Wall to Evaluate Inner Structure and Bio-Degradation Non-Destructively
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Nondestructive Characterization of and Defect Detection in Timber and Wood
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Effect of Elastic Modulus and Poisson's Ratio on Guided Wave Dispersion Using Transversely Isotropic Material Modelling
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Ultrasonic Imaging of Defects in Building Elements Made from Timber
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Assessment of Timber Structures Using the X-Ray Technology
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Non Destructive Characterization of Wooden Members Using near Infrared Spectroscopy
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Approaches to the Moisture Content Monitoring Intimber Elements: Development of a Resistive Method
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Effect of Elastic Modulus and Poisson's Ratio on Guided Wave Dispersion Using Transversely Isotropic Material Modelling

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Abstract:

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.

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Periodical:

Advanced Materials Research (Volume 778)

Pages:

303-311

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.778.303

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Online since:

September 2013

Authors:

Mahbube Subhani, Jian Chun Li, Hauke Gravenkamp, Bijan Samali

Keywords:

Dispersion Curves, Guided Wave, Orthotropic Material, Timber, Transversely Isotropic Material

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