Wear induced changes in surface topography during running-in of rolling-sliding contacts
Wear induced changes in surface topography during running-in of rolling-sliding contacts
Running-in occurs in rolling-sliding contacts under mixed-friction conditions and typically involves asperity smoothing through mild wear and plastic deformation. To improve the prediction of service life or friction of rolling-element bearings under mixed-friction conditions, knowledge of surface topography changes during running-in and their dependence on the operating condition is an important prerequisite. Therefore, this study aims to describe the surface mechanisms due to wear, during running-in and their dependence on one of the variables, slip.
AISI 52100 steel specimens were tested in a mini traction machine (MTM) instrumented with friction and contact potential measurement in the presence of a PAO base oil, operating in the mixed lubrication regime. A novel method of pre and post-test surface relocation with 3-D optical profilometry and scanning electron microscopy (SEM) was implemented. Rolling-sliding tests were performed to study the effect of slide-roll ratio on the surface topography changes during running-in. Additional tests were conducted to track the changes to surface topography during this period.
The results exhibit the rapid nature of running-in and how most of the surface topography changes occur in the first few load cycles. Surface topography transitions such as asperity removal due to wear, increase in the load-bearing area of the asperities and in tests with slip, plastic flow of material from peaks into adjacent valleys are shown at high magnification. Surface profilometry measurements show that the reduction in depth of the valleys due to plastic flow adds to the reduction in roughness, thus accurately identifying the surface mechanism, and redressing the consensus that the reduction in roughness during running-in is mainly due to wear and plastic deformation diminishing the height of the peaks, which is true for ideal running-in alone.
Bearings, Plastic deformation, Plastic flow, Running-in, Slip, Wear
Sakhamuri, Maruti Sai Dhiraj
14bce511-e885-448e-b860-8bcc0e0e8575
Harvey, Terence
3b94322b-18da-4de8-b1af-56d202677e04
Vierneusel, Bernd
e9806523-72e4-4e2a-88b6-6724d1154401
Wood, Robert
d9523d31-41a8-459a-8831-70e29ffe8a73
1 June 2023
Sakhamuri, Maruti Sai Dhiraj
14bce511-e885-448e-b860-8bcc0e0e8575
Harvey, Terence
3b94322b-18da-4de8-b1af-56d202677e04
Vierneusel, Bernd
e9806523-72e4-4e2a-88b6-6724d1154401
Wood, Robert
d9523d31-41a8-459a-8831-70e29ffe8a73
Sakhamuri, Maruti Sai Dhiraj, Harvey, Terence, Vierneusel, Bernd and Wood, Robert
(2023)
Wear induced changes in surface topography during running-in of rolling-sliding contacts.
Wear, 522 (6), [204685].
(doi:10.1016/j.wear.2023.204685).
Abstract
Running-in occurs in rolling-sliding contacts under mixed-friction conditions and typically involves asperity smoothing through mild wear and plastic deformation. To improve the prediction of service life or friction of rolling-element bearings under mixed-friction conditions, knowledge of surface topography changes during running-in and their dependence on the operating condition is an important prerequisite. Therefore, this study aims to describe the surface mechanisms due to wear, during running-in and their dependence on one of the variables, slip.
AISI 52100 steel specimens were tested in a mini traction machine (MTM) instrumented with friction and contact potential measurement in the presence of a PAO base oil, operating in the mixed lubrication regime. A novel method of pre and post-test surface relocation with 3-D optical profilometry and scanning electron microscopy (SEM) was implemented. Rolling-sliding tests were performed to study the effect of slide-roll ratio on the surface topography changes during running-in. Additional tests were conducted to track the changes to surface topography during this period.
The results exhibit the rapid nature of running-in and how most of the surface topography changes occur in the first few load cycles. Surface topography transitions such as asperity removal due to wear, increase in the load-bearing area of the asperities and in tests with slip, plastic flow of material from peaks into adjacent valleys are shown at high magnification. Surface profilometry measurements show that the reduction in depth of the valleys due to plastic flow adds to the reduction in roughness, thus accurately identifying the surface mechanism, and redressing the consensus that the reduction in roughness during running-in is mainly due to wear and plastic deformation diminishing the height of the peaks, which is true for ideal running-in alone.
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Accepted/In Press date: 29 December 2022
Published date: 1 June 2023
Additional Information:
Publisher Copyright:
© 2023 The Author(s)
Venue - Dates:
24th International Conference on Wear of Materials, 2023-04-16 - 2023-04-20
Keywords:
Bearings, Plastic deformation, Plastic flow, Running-in, Slip, Wear
Identifiers
Local EPrints ID: 475342
URI: http://eprints.soton.ac.uk/id/eprint/475342
ISSN: 0043-1648
PURE UUID: 92ef965c-fb9a-4fec-956d-e321b8984478
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Date deposited: 15 Mar 2023 17:47
Last modified: 17 Mar 2024 02:40
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Author:
Maruti Sai Dhiraj Sakhamuri
Author:
Bernd Vierneusel
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