Journal
NDT & E INTERNATIONAL
Volume 75, Issue -, Pages 72-79Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2015.06.007
Keywords
EMAT; Guided waves; Shear horizontal; Pipe support; Defects
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN-2014-03671]
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Due to the large number of pipe supports over a piping run, a rapid reliable NDT system is needed to identify hidden corrosion defects at a pipe-support interface. To accomplish this, a system using Periodic Permanent Magnet (PPM) Electromagnetic Acoustic Transducers (EMAT's) to generate dispersive SH1 guided waves is implemented. For this study, both the effect of the support contact and a corrosion type defect are evaluated independently through finite element models and experiments utilizing a flat plate approximation. It was found that utilizing the SH1 plate wave near the inflection point or 'knee' of the dispersion curve yields a high sensitivity to gradual wall loss defects while experiencing a minimal effect from the support contact. (C) 2015 Elsevier Ltd. All rights reserved.
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