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TECHNICAL PAPERS

Lubricants With Non-Newtonian Rheology and Their Degradation in Line Contacts

[+] Author and Article Information
Ilya I. Kudish, Ruben G. Airapetyan

Kettering University, Flint, MI 48504, USA

J. Tribol 126(1), 112-124 (Jan 13, 2004) (13 pages) doi:10.1115/1.1609484 History: Received April 01, 2003; Revised June 05, 2003; Online January 13, 2004
Copyright © 2004 by ASME
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References

Figures

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The map of flow streamlines z(x) for the non-degrading lubricant with Newtonian rheology, s0=0
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The pressure distribution p(x) for the lubricant with Newtonian (solid line) rheology, s0=0. The Hertzian pressure distribution is represented by a dashed line.
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The gap distribution h(x) for the lubricant with Newtonian rheology, s0=0
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The sliding frictional stress f(x) distributions for the non-degrading lubricants with Newtonian (dashed line) and non-Newtonian (solid line) rheologies and for the degrading lubricants with Newtonian (dashed bold line) and non-Newtonian (solid bold line) rheologies, s0=−0.5
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Frictional stresses τ1 and τ2 applied to the contact surfaces for nondegrading (dashed line) and degrading (bold dashed line) Newtonian lubricants and for non-degrading (solid line) and degrading (bold solid line) non-Newtonian lubricants under mixed rolling and sliding conditions (s0=−0.5) and the surface frictional stresses τ2=−τ1=(6H02/V)hdp/dx) for the nondegrading Newtonian lubricant (dashed-dotted line) under pure rolling conditions (s0=0)
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The map of the flow streamlines for the degrading lubricant with the non-Newtonian rheology under pure rolling conditions (s0=0)
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The map of the horizontal component u of the lubricant velocity along the flow streamlines for the degrading lubricant with the non-Newtonian rheology under pure rolling conditions (s0=0)
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The reciprocal of the lubricant viscosity μ in the Newtonian and non-Newtonian lubrication film under pure rolling conditions (s0=0). The variable z is an artificially stretched z-coordinate across the film thickness (namely, z=zh(a)/h(x)) to make the relationship more transparent.
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The distribution of the molecular weight W in the degrading lubricants with Newtonian and non-Newtonian rheologies along the flow streamline closest to z=0 and running through the whole contact below z=0 under pure rolling conditions (s0=0)
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The map of the flow streamlines z(x) for the degrading lubricants with Newtonian and non-Newtonian rheologies under mixed rolling and sliding conditions (s0=−0.5)
Grahic Jump Location
The map of the horizontal component u of the lubricant velocity along the flow streamlines for the degrading lubricants with Newtonian and non-Newtonian rheologies under mixed rolling and sliding conditions (s0=−0.5)
Grahic Jump Location
The reciprocal of the viscosity μ in the lubricants with Newtonian and non-Newtonian rheologies under mixed rolling and sliding conditions (s0=−0.5). The variable z is an artificially stretched z-coordinate across the film thickness (namely, z=zh(a)/h(x)) to make the relationship more transparent.
Grahic Jump Location
The distribution of the molecular weight W in the degrading lubricants with Newtonian and non-Newtonian rheologies along the flow streamline closest to z=0 and running through the whole contact below z=0 under mixed rolling and sliding conditions (s0=−0.5)

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