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Full-field pulsed-magneto-photoelasticity - a description of the instrument

Gibson, S., Tomlinson, R.A. and Jewell, G.W. (2006) Full-field pulsed-magneto-photoelasticity - a description of the instrument. Journal of Strain Analysis for Engineering Design, 41 (2). pp. 161-170. ISSN 0309-3247

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Abstract

This paper describes a novel instrument used for the analysis of full-field through-thickness stress distributions using the theory of magneto-photoelasticity (MPE) developed by Aben and Clarke et al. [ , , ]. MPE is an experimental stress analysis technique which involves the application of a magnetic field parallel to an electromagnetic wave propagating through a birefringent model within a polariscope. The effect viewed through the polariscope is then a combination of the model’s birefringence and the Faraday rotation created in the model by the magnetic field. Aben developed this technique especially for use in the measurement of stress profiles where the integrated photoelastic pattern alone yields little information. Clarke et al. developed MPE in order to study toughened glass. To date, the technique of MPE has been a single-point measurement and this is of limited utility in the investigation of 3D stress in toughened glasses. The pulsed-magneto-polariscope (PMP), described here, enables the full-field application of MPE. This paper contains a description of the novel apparatus, and demonstrations used to validate the performance of a proof-of-concept PMP instrument. The paper also highlights improvements in the application of MPE which are now possible with this new equipment. These improvements include the extension of MPE to larger areas of analysis, 3D stress analysis and the possibility of analysing a general unknown stress distribution.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright (c) 2006 Professional Engineering Publishing. Uploaded with permission from the publisher and in accordance with the publisher's self-archiving policy.
Keywords: Three-dimensional photoelasticity, residual stress measurement, toughened glass.
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield)
The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield)
Depositing User: Mr Christopher Hardwick
Date Deposited: 02 Nov 2009 17:24
Last Modified: 15 Sep 2014 01:35
Published Version: http://dx.doi.org/10.1243/03093247JSA92
Status: Published
Publisher: Professional Engineering Publishing
Refereed: Yes
Identification Number: 10.1243/03093247JSA92
URI: http://eprints.whiterose.ac.uk/id/eprint/9206

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