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Numerical modelling of Lamb wave propagation in 2D plate structures

Part of: The 19th and 20th Australian International Aerospace Congresses

Published online by Cambridge University Press:  18 October 2023

L. Pollock Open the ORCID record for L. Pollock [Opens in a new window]  and
G. Wild Open the ORCID record for G. Wild [Opens in a new window]
L. Pollock*
Affiliation:
School of Engineering and Information Technology, UNSW Canberra, ACT, 2612 Australia
G. Wild
Affiliation:
School of Engineering and Information Technology, UNSW Canberra, ACT, 2612 Australia
*
Corresponding author: L. Pollock; Email: L.Pollock@adfa.edu.au
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Abstract

Lamb waves are a growing method for the Non-Destructive Testing and Evaluation (NDT&E) and structural health monitoring (SHM) of aerospace vehicles. These guided waves can propagate over large distances and have a strong tendency to interact with damage. Whilst several methods exist for the modelling of Lamb wave propagation, this paper is the first to introduce a first principles numerical model that can efficiently and accurately predict the behaviour of Lamb waves. The numerical model is easier to understand and implement compared with analytical solutions and significantly faster than discretised numerical methods. The numerical model is presented in detail for an isotropic and homogenous plate, along with validation against the industry accepted, WaveForm Revealer 3 (WFR3) software. The results show a mean correlation across all assessed parameters of 90.4% and 96.6% for the symmetric and antisymmetric modes, respectively. Further discussion is provided on future developments to the model, including on the topic of high temperature effects, anisotropic materials and edge reflections.

Keywords

structural health monitoringnon-destructive testingacoustic emissionsultrasonics
Type
Research Article
Information
The Aeronautical Journal , Volume 127 , Special Issue 1318: AIAC 2023 , December 2023 , pp. 2187 - 2203
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of Royal Aeronautical Society

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Footnotes

A version of this paper first appeared at The Australian International Aerospace Congress 2021 (AIAC19).

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