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An ultrasonic technique for the measurement of elastic properties of soft surface coatings

Dwyer-Joyce, R.S. and Hankinson, N. (2006) An ultrasonic technique for the measurement of elastic properties of soft surface coatings. Tribology International, 39 (4). pp. 326-331. ISSN 0301679X

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The properties of thin layers of materials can be different from those in the bulk form. The response of a coating to any given load and its ability to remain bonded to the substrate will depend on its elastic modulus and Poisson's ratio. In this study a measurement method based on ultrasonic bulk wave reflection was evaluated. As a model system, a thin layer of polyethylene was pressed between two solid steel bodies. The reflection spectra of longitudinal and shear ultrasonic waves were recorded from the coating. The frequencies at which the layer resonates were measured and from this the wave speeds deduced. The Poisson's ratio can be determined from these two wave speeds and if the layer thickness is known the modulus is also available. The tests yielded reasonable values for both. This approach is only suitable if the layer can be made to resonate by the available ultrasonic frequencies; typically this will be the case for thicker coatings (tens of microns). Further, good coupling between the layer material and the steel bodies is necessary so that the interfaces do not themselves act to reflect ultrasound. This is better achieved with a smooth soft coating.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright (c) 2006 Elsevier Science B.V., Amsterdam. This is an author produced version of a paper published in ' Tribology International '. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Elastic properties Surface coatings Ultrasound Coatings Elasticity Poisson ratio Polyethylenes Ultrasonic effects Surfaces
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield)
Depositing User: Mr Christopher Hardwick
Date Deposited: 18 Aug 2009 17:23
Last Modified: 08 Feb 2013 16:58
Published Version: http://dx.doi.org/10.1016/j.triboint.2005.02.003
Status: Published
Publisher: Elsevier Science B.V., Amsterdam
Refereed: Yes
Identification Number: 10.1016/j.triboint.2005.02.003
URI: http://eprints.whiterose.ac.uk/id/eprint/9177

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