Investigation of guided wave propagation in pipes fully- and partially-embedded in concrete
File(s)
Published version
Author(s)
Leinov, E
Lowe, MJS
Cawley, P
Type
Journal Article
Abstract
The application of long-range guided-wave testing to pipes embedded in concrete results in unpredictable test-ranges. The influence of the circumferential extent of the embedding-concrete around a steel pipe on the guided wave propagation is investigated. An analytical model is used to study the axisymmetric fully embedded pipe case, while explicit finite-element and semi-analytical finite-element simulations are utilised to investigate a partially embedded pipe. Model predictions and simulations are compared with full-scale guided-wave tests. The transmission-loss of the T(0,1)-mode in an 8 in. steel pipe fully embedded over an axial length of 0.4 m is found to be in the range of 32–36 dB while it reduces by a factor of 5 when only 50% of the circumference is embedded. The transmission-loss in a fully embedded pipe is mainly due to attenuation in the embedded section while in a partially embedded pipe it depend strongly on the extent of mode-conversion at entry to the embedded-section; low loss modes with energy concentrated in the region of the circumference not-covered with concrete have been identified. The results show that in a fully embedded pipe, inspection beyond a short distance will not be possible, whereas when the concrete is debonded over a fraction of the pipe circumference, inspection of substantially longer lengths may be possible.
Date Issued
2016-12-27
Date Acceptance
2016-11-29
Citation
The Journal of the Acoustical Society of America, 2016, 140 (6)
ISSN
1520-8524
Publisher
Acoustical Society of America
Journal / Book Title
The Journal of the Acoustical Society of America
Volume
140
Issue
6
Copyright Statement
© 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative
Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
License URL
Sponsor
Engineering & Physical Science Research Council (EPSRC)
Grant Number
EP/J01284X/1
Subjects
Acoustics
MD Multidisciplinary
Publication Status
Published
Article Number
4528