Nanoscale elastoplastic adhesion of wet asperities
Nanoscale elastoplastic adhesion of wet asperities
Accurate prediction of friction is crucial for design and efficient operation of many devices, comprising various contacts. In practice, contacting surfaces are rough and often wet. There are several mechanisms, which contribute to friction, including viscous shear of a coherent fluid film, as well as that of a thin adsorbed layer of boundary active molecular species. Additionally, adhesion and elastoplastic deformation of asperities on counterface surfaces may occur. Traditional friction models are based on statistical representation of surface topography as well as description of boundary shear films based on the theoretical lubricant film Eyring shear stress. The paper reports a more realistic friction model than the traditional ones, which do not take into account the wet nature of the asperities. The fluid-surface interaction is a main contribution of the paper, not hitherto reported in literature. It is shown that ignoring the effect of surface wetness can lead to the over-estimation of boundary friction and under-estimation of contact load carrying capacity.
asperity interactions, fractal geometry, adhesion, boundary shear films, statistical mechanics
Chong, W.W.F.
bd35fdf8-fa6d-4330-8bac-ae20cc8fc58e
Teodorescu, M.
10e22073-39f7-41c3-b2b7-2886c2d976f6
Rahnejat, H.
f5b9b13a-dc42-4fde-a98d-4e0c48bb19ab
29 January 2013
Chong, W.W.F.
bd35fdf8-fa6d-4330-8bac-ae20cc8fc58e
Teodorescu, M.
10e22073-39f7-41c3-b2b7-2886c2d976f6
Rahnejat, H.
f5b9b13a-dc42-4fde-a98d-4e0c48bb19ab
Chong, W.W.F., Teodorescu, M. and Rahnejat, H.
(2013)
Nanoscale elastoplastic adhesion of wet asperities.
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology.
(doi:10.1177/1350650112472142).
Abstract
Accurate prediction of friction is crucial for design and efficient operation of many devices, comprising various contacts. In practice, contacting surfaces are rough and often wet. There are several mechanisms, which contribute to friction, including viscous shear of a coherent fluid film, as well as that of a thin adsorbed layer of boundary active molecular species. Additionally, adhesion and elastoplastic deformation of asperities on counterface surfaces may occur. Traditional friction models are based on statistical representation of surface topography as well as description of boundary shear films based on the theoretical lubricant film Eyring shear stress. The paper reports a more realistic friction model than the traditional ones, which do not take into account the wet nature of the asperities. The fluid-surface interaction is a main contribution of the paper, not hitherto reported in literature. It is shown that ignoring the effect of surface wetness can lead to the over-estimation of boundary friction and under-estimation of contact load carrying capacity.
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Published date: 29 January 2013
Keywords:
asperity interactions, fractal geometry, adhesion, boundary shear films, statistical mechanics
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nCATS Group
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Local EPrints ID: 353121
URI: http://eprints.soton.ac.uk/id/eprint/353121
ISSN: 1350-6501
PURE UUID: fc61c6aa-3ab2-497a-9dae-ee26cefc44bf
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Date deposited: 03 Jun 2013 09:17
Last modified: 14 Mar 2024 14:01
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Author:
W.W.F. Chong
Author:
M. Teodorescu
Author:
H. Rahnejat
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