Childs, THC (2018) Comment on 'The cutting of metals by plastic buckling' by Udupa et al. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 474 (2216). ISSN 1364-5021
Abstract
In a recent paper on machining annealed copper at a low cutting speed, and at an uncut chip thickness one tenth of the mean grain size of the copper, Udupa et al. (Proc. R. Soc A473:20160863, doi:10.1098/rspa.2016.0863) report chip thicknesses larger than 10 times the uncut thickness and then a new mode of chip formation. Plastic bulging occurs in the surface of the copper ahead of the tool, leading to chip formation by a series of folds. The strain in the chip is less than that expected in a chip formed by shear according to long-standing classical theory. The authors suggest that the foundations of that theory need to be re-examined. In response, continuum mechanics numerical simulations presented here show a continuous transition from the classical condition towards that observed by Udupa et al. as the ratio of chip thickness to uncut thickness increases above ≈ 7. Bulging is obtained by introducing (approximately) material heterogeneity to the simulations at a grain size scale but whether such heterogeneity is essential for the bulging flows remains an open question.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | (c) 2018 The Author(s) Published by the Royal Society. All rights reserved. This is an author produced version of a paper accepted for publication in Proceedings of the Royal Society A. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Cutting, plasticity, annealed metals, instability, chip formation, finite element modelling. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Engineering Systems and Design (iESD) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 09 Jul 2018 10:06 |
Last Modified: | 22 Aug 2018 11:53 |
Status: | Published |
Publisher: | The Royal Society |
Identification Number: | 10.1098/rspa.2018.0170 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:132979 |