An analytical approach to reconstruction of axisymmetric defects in pipelines using T(0,1) guided waves

Da, Yihui, Liu, Dianzi and Qian, Zhenghua (2020) An analytical approach to reconstruction of axisymmetric defects in pipelines using T(0,1) guided waves. Applied Mathematics and Mechanics, 41 (10). 1479–1492. ISSN 1573-2754

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Abstract

Torsional guided waves have been widely utilized to inspect the surface corrosion in pipelines due to their simple displacement behaviors and the ability of longrange transmission. Especially, the torsional mode T(0, 1), which is the first order of torsional guided waves, plays the irreplaceable position and role, mainly because of its non-dispersion characteristic property. However, one of the most pressing challenges faced in modern quality inspection is to detect the surface defects in pipelines with a high level of accuracy. Taking into account this situation, a quantitative reconstruction method using the torsional guided wave T(0, 1) is proposed in this paper. The methodology for defect reconstruction consists of three steps. First, the reflection coefficients of the guided wave T(0, 1) scattered by different sizes of axisymmetric defects are calculated using the developed hybrid finite element method (HFEM). Then, applying the boundary integral equation (BIE) and Born approximation, the Fourier transform of the surface defect profile can be analytically derived as the correlative product of reflection coefficients of the torsional guided wave T(0, 1) and the fundamental solution of the intact pipeline in the frequency domain. Finally, reconstruction of defects is precisely performed by the inverse Fourier transform of the product in the frequency domain. Numerical experiments show that the proposed approach is suitable for the detection of surface defects with arbitrary shapes. Meanwhile, the effects of the depth and width of surface defects on the accuracy of defect reconstruction are investigated. It is noted that the reconstructive error is less than 10%, providing that the defect depth is no more than one half of the pipe thickness.

Item Type: Article
Uncontrolled Keywords: o343,boundary integral equation (bie),hybrid finite element method (hfem),quantitative reconstruction,torsional guided wave,mechanics of materials,mechanical engineering,applied mathematics ,/dk/atira/pure/subjectarea/asjc/2200/2211
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Depositing User: LivePure Connector
Date Deposited: 17 Jul 2020 23:45
Last Modified: 05 Feb 2021 02:42
URI: https://ueaeprints.uea.ac.uk/id/eprint/76160
DOI: 10.1007/s10483-020-2661-9

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