Investigation of guided wave propagation in pipes fully and partially embedded in concrete | Zendy

Eli Leinov | Zendy; M. J. S. Lowe | Zendy; P. Cawley | Zendy

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Investigation of guided wave propagation in pipes fully and partially embedded in concrete

Author(s) -

Eli Leinov,

M. J. S. Lowe,

P. Cawley

Publication year - 2016

Publication title -

the journal of the acoustical society of america

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.619

H-Index - 187

eISSN - 1520-8524

pISSN - 0001-4966

DOI - 10.1121/1.4972118

Subject(s) - circumference , attenuation , finite element method , guided wave testing , materials science , transmission (telecommunications) , range (aeronautics) , structural engineering , rotational symmetry , acoustics , mode (computer interface) , embedding , wave propagation , mechanics , composite material , physics , computer science , geometry , engineering , optics , telecommunications , mathematics , operating system , artificial intelligence

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

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