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Determination of micro-scale plastic strain caused by orthogonal cutting

Ghadbeigi, H., Bradbury, S.R., Pinna, C. and Yates, J.R. (2008) Determination of micro-scale plastic strain caused by orthogonal cutting. International Journal of Machine Tools and Manufacture, 48 (2). pp. 228-235. ISSN 0890-6955

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Abstract

An electron beam lithography technique has been used to produce microgrids in order to measure local plastic strains, induced during an orthogonal cutting process, at the microscopic scale in the shear zone and under the machined surface. Microgrids with a 10 μm pitch and a line width less than 1 μm have been printed on the polished surface of an aluminium alloy AA 5182 to test the applicability of the technique in metal cutting operations. Orthogonal cutting tests were carried out at 40 mm/s. Results show that the distortion of the grids could successfully be used to compute plastic strains due to orthogonal cutting with higher accuracy compared to other techniques reported in the literature. Strain maps of the machined specimens have been produced and show high-strain gradients very close to the machined surface with local values reaching 2.2. High-resolution strain measurements carried out in the primary deformation zone also provide new insight into the material deformation during the chip formation process.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright (c) 2008 Elsevier. This is an author produced version of a paper published in ' International Journal of Machine Tools and Manufacture'. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Large-strains Microgrid Orthogonal cutting Plastic deformation Aluminum alloys Electron beam lithography Metal cutting Microscopes Microstructure
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: 10 Nov 2009 16:04
Last Modified: 08 Feb 2013 16:59
Published Version: http://dx.doi.org/10.1016/j.ijmachtools.2007.08.01...
Status: Published
Publisher: Elsevier
Refereed: Yes
Identification Number: 10.1016/j.ijmachtools.2007.08.017
URI: http://eprints.whiterose.ac.uk/id/eprint/10109

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