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Title: Quantitative imaging of Young's modulus in plates using guided wave tomography
Authors: Ratassepp, Madis
Rao, Jing
Fan, Zheng
Keywords: Engineering::Aeronautical engineering
Issue Date: 2017
Source: Ratassepp, M., Rao, J., & Fan, Z. (2018). Quantitative imaging of young's modulus in plates using guided wave tomography. NDT and E International, 94, 22-30. doi:10.1016/j.ndteint.2017.09.016
Journal: NDT and E International
Abstract: An ultrasonic tomographic imaging technique is proposed for measurement of the distribution of Young's modulus in an isotropic plate. This technique is based on velocity mapping which is performed by applying full waveform inversion on the ultrasonic signals captured by transducers around the stiffness variations. The resulting wave velocity maps are then converted to Young's modulus maps by the known dispersion relation of selected guided modes. Finite element simulations were carried out to investigate the reconstruction performance of A0 mode propagating through various smoothly varying stiffness defects in a plate. It is shown that for selected cases an average through-thickness Young's modulus can be accurately reconstructed and its potential to describe flexural stiffness of the plate is discussed. The model was validated by experiments, where Young's modulus was varied in a steel plate via heating. The map of the Young's modulus was reconstructed from temperature measurements and ultrasound data and results from the two methods showed excellent agreement.
ISSN: 0963-8695
DOI: 10.1016/j.ndteint.2017.09.016
Schools: School of Mechanical and Aerospace Engineering 
Rights: © 2017 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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