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A multiscale finite element model of sliding wear for cobalt-chromium undergoing ratcheting wear

A multiscale finite element model of sliding wear for cobalt-chromium undergoing ratcheting wear
A multiscale finite element model of sliding wear for cobalt-chromium undergoing ratcheting wear
Cobalt-chromium alloys are used in reciprocated sliding wear applications where the mated surfaces cannot be lubricated, due to their excellent frictional properties and ability to resist seizure. However, various health risks due to cobalt wear particle generation motivate the replacement of cobalt-based systems. It is suggested that a numerical model of reciprocated dry sliding wear for cobalt-chromium alloys would aid in the development of cobalt-free alternatives to remove any health risks. Therefore, this work focuses on building a mechanistic, i.e. determined purely through physical terms, numerical degredation model of dry reciprocated sliding wear for a specific cobalt-chromium alloy, informed by the experimental literature, to gain an understanding of cobalt wear-rates in response to the tribological loading conditions. A multi-scale method is employed, where the wear is determined by a microscale model of wear, which simulates wear after the material is brought up to a critical strain to failure and material rupture occurs, and the microscale wear-rates are homogenised to the macroscale by use of a statistic model of rough contact. This improves over previous methods by allowing one to observe how material wear-rates are controlled by changes in the elasto-plastic material parameters and geometry of an engineering component. The current numerical model predicts the correct scale of wear, in the range of 1 × 10− 14 m3 /Nm or 1 × 10− 5 mm3 /Nm, typical for the chosen alloy under dry sliding conditions and is validated against experimental data. The model allows for further development, such as the incorporation of frictional heating, microscale heterogeneity, or the evolution of surface roughness parameters during wear.
Cobalt-chromium, Homogenisation, Multiscale modelling, Ratcheting wear, Reciprocated sliding
0043-1648
Cross, Paul Sebastian George
c77a625f-55cb-43f8-9e76-54a8653a6b7d
Limbert, Georges
a1b88cb4-c5d9-4c6e-b6c9-7f4c4aa1c2ec
Wood, Robert
d9523d31-41a8-459a-8831-70e29ffe8a73
Stewart, D.
b1e2491e-53f7-4429-922a-f2eaddf26b19
Cross, Paul Sebastian George
c77a625f-55cb-43f8-9e76-54a8653a6b7d
Limbert, Georges
a1b88cb4-c5d9-4c6e-b6c9-7f4c4aa1c2ec
Wood, Robert
d9523d31-41a8-459a-8831-70e29ffe8a73
Stewart, D.
b1e2491e-53f7-4429-922a-f2eaddf26b19

Cross, Paul Sebastian George, Limbert, Georges, Wood, Robert and Stewart, D. (2020) A multiscale finite element model of sliding wear for cobalt-chromium undergoing ratcheting wear. Wear, 462-463, [203482]. (doi:10.1016/j.wear.2020.203482).

Record type: Article

Abstract

Cobalt-chromium alloys are used in reciprocated sliding wear applications where the mated surfaces cannot be lubricated, due to their excellent frictional properties and ability to resist seizure. However, various health risks due to cobalt wear particle generation motivate the replacement of cobalt-based systems. It is suggested that a numerical model of reciprocated dry sliding wear for cobalt-chromium alloys would aid in the development of cobalt-free alternatives to remove any health risks. Therefore, this work focuses on building a mechanistic, i.e. determined purely through physical terms, numerical degredation model of dry reciprocated sliding wear for a specific cobalt-chromium alloy, informed by the experimental literature, to gain an understanding of cobalt wear-rates in response to the tribological loading conditions. A multi-scale method is employed, where the wear is determined by a microscale model of wear, which simulates wear after the material is brought up to a critical strain to failure and material rupture occurs, and the microscale wear-rates are homogenised to the macroscale by use of a statistic model of rough contact. This improves over previous methods by allowing one to observe how material wear-rates are controlled by changes in the elasto-plastic material parameters and geometry of an engineering component. The current numerical model predicts the correct scale of wear, in the range of 1 × 10− 14 m3 /Nm or 1 × 10− 5 mm3 /Nm, typical for the chosen alloy under dry sliding conditions and is validated against experimental data. The model allows for further development, such as the incorporation of frictional heating, microscale heterogeneity, or the evolution of surface roughness parameters during wear.

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Accepted/In Press date: 2 September 2020
e-pub ahead of print date: 28 September 2020
Published date: 15 December 2020
Keywords: Cobalt-chromium, Homogenisation, Multiscale modelling, Ratcheting wear, Reciprocated sliding

Identifiers

Local EPrints ID: 445291
URI: http://eprints.soton.ac.uk/id/eprint/445291
ISSN: 0043-1648
PURE UUID: cf8daf12-adf7-4360-80d6-917bf2222aa1
ORCID for Paul Sebastian George Cross: ORCID iD orcid.org/0000-0001-7768-5659
ORCID for Robert Wood: ORCID iD orcid.org/0000-0003-0681-9239

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Date deposited: 01 Dec 2020 17:31
Last modified: 26 Nov 2021 06:58

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Contributors

Author: Paul Sebastian George Cross ORCID iD
Author: Georges Limbert
Author: Robert Wood ORCID iD
Author: D. Stewart

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