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Multiple Wavemode Scanning for Near and Far-Side Defect Characterisation

Authors
  • Xiang, L1
  • Edwards, R S1
  • 1 University of Warwick, Coventry, UK , Coventry (United Kingdom)
Type
Published Article
Journal
Journal of Nondestructive Evaluation
Publisher
Springer US
Publication Date
Jan 08, 2020
Volume
39
Issue
1
Identifiers
DOI: 10.1007/s10921-019-0651-0
Source
Springer Nature
Keywords
License
Green

Abstract

The combination of ultrasonic inspections using different wavemodes can give more information than is available with single mode inspection. In this work, the response of shear and Rayleigh waves to surface-breaking defects propagating on the near-side and far-side of a sample is investigated. The directivity of shear waves generated by a racetrack coil electromagnetic acoustic transducer (EMAT) is identified and used to set an ideal separation for a pair of transmit-receive EMATs. Defects are indicated by a reduction in the transmitted Rayleigh wave amplitude, and by blocking of the shear wave. Used together, these can identify features in the bulk wave behaviour which are due to near-face surface-breaking defects, and give a full picture of both surfaces. By using a combination of the two wavemodes, the angle of propagation and length of any near-side defects can additionally be identified. A scanning method for samples is proposed.

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