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Characterisation of hidden defects using the near-field ultrasonic enhancement of Lamb waves
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Clough, A. R. and Edwards, R. S. (Rachel S.) (2015) Characterisation of hidden defects using the near-field ultrasonic enhancement of Lamb waves. Ultrasonics, 59 . pp. 64-71. doi:10.1016/j.ultras.2015.01.012
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WRAP_Ultrasonics_hiddencracks_Clough_revised.pdf - Accepted Version - Requires a PDF viewer. Download (1961Kb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.ultras.2015.01.012
Abstract
Defects that propagate from the inside of a structure can be difficult to detect by traditional non-destructive inspection methods. A non-contact inspection method is presented here that uses the near-field interactions of ultrasonic Lamb waves to detect defects propagating into a 1.5 mm thick aluminium sheet from the opposite side to that which is inspected. Near-field interactions of the S0 Lamb waves with the defects are shown to give rise to a characteristic increase in the wave magnitude, which is used to position and characterise these hidden defects. It is shown that such defects are difficult to detect from a study of their influence on ultrasonic transmission alone. Single defects of different depths, and systems of multiple defects with varying separations and relative depths, are successfully detected in both experimental trials and FEM simulations. Reliable single defect detection is achieved for defects with a minimum depth of 30% of the plate thickness, and resolution of multiple defects is achieved for defect separations of 5 mm.
| Item Type: | Journal Article | ||||||||||
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| Subjects: | Q Science > Q Science (General) Q Science > QC Physics |
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| Divisions: | Faculty of Science > Engineering Faculty of Science > Physics |
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| Library of Congress Subject Headings (LCSH): | Lamb waves, Stress corrosion | ||||||||||
| Journal or Publication Title: | Ultrasonics | ||||||||||
| Publisher: | Elsevier | ||||||||||
| Official Date: | May 2015 | ||||||||||
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| Volume: | 59 | ||||||||||
| Number of Pages: | 8 | ||||||||||
| Page Range: | pp. 64-71 | ||||||||||
| DOI: | 10.1016/j.ultras.2015.01.012 | ||||||||||
| Status: | Peer Reviewed | ||||||||||
| Publication Status: | Published | ||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||
| Funder: | European Research Council (ERC) | ||||||||||
| Grant number: | 202735 (ERC) |
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