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Research Papers: Elastohydrodynamic Lubrication

Impact Micro-Elastohydrodynamics in Point Contacts

[+] Author and Article Information
M. Kaneta, F. Guo, J. Wang

Department of Mechanical and Electronic Systems Engineering,  Kyushu Kyoritsu University, Kitakyushu, 807-8585, Japan e-mail: motokaneta@sirius.ocn.ne.jpe-mail: meguof@yahoo.com.cne-mail: wj20011226@163.com School of Mechanical Engineering,  Qingdao Technological University, Qingdao, 266033, China

J. Tribol 133(3), 031503 (Jul 21, 2011) (9 pages) doi:10.1115/1.4004312 History: Received November 26, 2010; Revised April 27, 2011; Published July 21, 2011; Online July 21, 2011

The influences of a single bump (dent) or regularly arranged bumps (dents) on the film thickness in impact circular elasthydrodynamic lubrication (EHL) contacts lubricated with a Newtonian lubricant are investigated numerically. It has been found that the deformation of the bump or the dent at the contact center depends mainly on the macroscopic pressure distribution produced between the smooth surfaces by impact. The macroscopic pressure distribution is influenced by the initial impact gap, the loading speed, and the mass of the moving body. The central bump or dent hardly deforms when the initial impact gap or the base radius of the bump or dent is small. When the initial impact gap is large and the radius of the base of the central bump is not so small, the oil is entrapped in the bump, and micro-dimple is formed. The deformation of noncentral bumps or dents is mainly influenced by the film profile under conditions of smooth surfaces.

Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Analytical model

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Figure 2

Comparison of smooth surface film thickness distributions between 1D and 2D calculations; wt  = 10 N/ms, m = 0.0668 kg

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Figure 3

Effect of initial impact gap on smooth surface film thickness and pressure distributions; wt  = 10 N/ms, m = 0.0668 kg

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Figure 4

Effects of initial impact gap, loading speed and mass on smooth surface film thickness and pressure distributions

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Figure 5

Effect of moving body mass on time variations of smooth surface film thickness and pressure distributions; hini  = 2 μm, wt  = 10 N/ms; curves corresponding to panels (b), (d) and (f) for m = 0.0668 kg are omitted

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Figure 6

Effects of initial impact gap and bump size on central semiparaboloidal bump; wt  = 10 N/ms, m = 0.0668 kg

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Figure 7

Time variation of film thickness and pressure distributions; hini  = 0.65 μm, wt  = 10 N/ms, m = 0.0668 kg, A = 0.5 μm, B = 50 μm; dotted lines correspond to smooth surface results

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Figure 8

Time variation of film thickness and pressure distributions; hini  = 4 μm, wt  = 10 N/ms, m = 0.0668 kg, A = 0.5 μm, B = 50 μm; dotted lines correspond to smooth surface results

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Figure 9

Effects of loading speed and mass on deformation of semiparaboloidal bump; hini  = 2 μm, A = 0.5 μm, B = 50 μm

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Figure 10

Effects of initial impact gap and bump size on deformation of cosine-shaped central bump; wt  = 10 N/ms, m = 0.0668 kg

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Figure 11

Effects of initial impact gap and dent size on deformation of semiparaboloidal dent located in the contact center; wt  = 10 N/ms, m = 0.0668 kg

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Figure 12

Film thickness contour map for regularly arranged semiparaboloidal bumps, t = 10 ms, ΔH = 0.02; hini  = 1.5 μm, wt  = 10 N/ms, m = 0.0668 kg, A = 0.5 μm, B = 25 μm, L = 100 μm

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Figure 13

Time variation of film thickness and pressure distributions; hini  = 1.5 μm, wt  = 10 N/ms, m = 0.0668 kg, A = 0.5 μm, B = 25 μm, L = 100 μm

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Figure 14

Formation process of micro-dimple corresponding to Figs.  1213

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Figure 17

Film thickness and pressure distributions along Y = 0; hini  = 1.5 μm, wt  = 10 N/ms, m = 0.0668 kg

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Figure 18

Film thickness contour map; hini  = 1.5 μm, wt  = 10 N/ms, m = 0.0668 kg, ΔH = 0.01

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Figure 15

Film thickness contour map showing the effects of mass and loading speed; hini  = 1.5 μm, A = 0.2 μm, B = 25 μm, L = 100 μm, ΔH = 0.02

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Figure 16

Film thickness distribution showing the effects of mass and loading speed; hini  = 1.5 μm, A = 0.2 μm, B = 25 μm, L = 100 μm, thin lines denote smooth surface result

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