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Measurement of deformation gradients in hot rolling of AA3004

Boldetti, C., Pinna, C., Howard, I. C. and Gutierrez, G. (2005) Measurement of deformation gradients in hot rolling of AA3004. Experimental Mechanics, 45 (6). pp. 517-525. ISSN 00144851

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Abstract

In this paper we describe an experimental technique developed to measure the deformation gradients and temperature in a single hot rolling pass of an AA3004 sample that was fitted with an insert. The insert had been previously hand engraved with a 1 × 1 mm grid pitch, and the analysis of the data digitally captured from the image of the deformed grid enabled the calculation of the components of the deformation gradient tensor. Four steel pins prevented relative motion between the insert and the rest of the sample. No detachment was observed between insert and sample after rolling. The temperature was measured during rolling using two embedded thermocouples, one close to the surface and the other in the centerline. The commercial finite element code ABAQUS was used to create a three-dimensional model of the rolling process. The recorded temperature was compared to the numerical values evaluated after tuning the heat transfer coefficient. The shape of the grid after rolling was checked against the deformed mesh using different friction coefficients in order to obtain the optimum match. The unusually large length of the insert enabled the rolling process to be stopped halfway so that a picture of the roll-gap area could be obtained. This provided a partially deformed grid that represented the transient state during rolling. The experimentally determined deformation gradient in this area as well as in the steady-state area agreed well with the finite element predictions. © 2005 Society for Experimental Mechanics.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright (c) 2005 Springer Verlag. This is an author produced version of a paper published in ' Experimental Mechanics '. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Aluminum alloy Deformation gradient Finite element modeling Grid Hot rolling Aluminum alloys Deformation Finite element method Friction Heat transfer coefficients Mathematical models Steel Temperature measurement Tensors Thermocouples Deformation gradients Steel pins
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 13:20
Last Modified: 08 Feb 2013 16:59
Status: Published
Publisher: Springer Verlag
Refereed: Yes
Identification Number: 10.1177/0014485105059550
URI: http://eprints.whiterose.ac.uk/id/eprint/10108

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