Attenuation of ultrasonic Rayleigh–Lamb waves by small horizontal defects in thin aluminium plates
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|Title:||Attenuation of ultrasonic Rayleigh–Lamb waves by small horizontal defects in thin aluminium plates||Authors:||Gilchrist, M. D.||Permanent link:||http://hdl.handle.net/10197/4774||Date:||Apr-1999||Abstract:||The present paper illustrates how horizontal symmetric crack-like defects can be detected rapidly in thin isotropic plates by using longitudinal ultrasonic waves. The use of such longitudinal waves offers the potential of being significantly faster for non-destructively detecting defects than conventional ultrasonic techniques, which rely on transverse waves propagating through the thickness of a plate. Computational and analytical methods are used to predict reflection coefficients due to the attenuation of a longitudinal ultrasonic wave by physically small defects. It is shown that detectable attenuation (>10%), i.e. reflection coefficients, of the lowest order symmetric Rayleigh–Lamb wave (S0) occurs for a range of small defects (sub-millimeter in length) when using high-frequency waves (MHz range).||Type of material:||Journal Article||Publisher:||Elsevier||Copyright (published version):||1999 Elsevier||Keywords:||Ultrasonics; Rayleigh–Lamb waves; NDE; Crack detection; Rolling defects||DOI:||10.1016/S0020-7403(98)00083-6||Language:||en||Status of Item:||Peer reviewed|
|Appears in Collections:||Mechanical & Materials Engineering Research Collection|
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