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: UltrasonicsRayleigh–Lamb wavesNDECrack detectionRolling 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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