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Research Papers: Contact Mechanics

Contact Pressure of Indented Wide Elliptical Contacts: Dry and Lubricated Cases

[+] Author and Article Information
N. Biboulet

LaMCoS, INSA-Lyon, CNRS UMR5259, F69621 Villeurbanne, France; TIMKEN Europe, 2 rue Timken, 68002 Colmar, France

A. A. Lubrecht

LaMCoS, INSA-Lyon, CNRS UMR5259, F69621 Villeurbanne, France

L. Houpert

 TIMKEN Europe, 2 rue Timken, 68002 Colmar, France

J. Tribol 130(4), 041403 (Aug 07, 2008) (7 pages) doi:10.1115/1.2960496 History: Received November 14, 2007; Revised June 17, 2008; Published August 07, 2008

Indents perturb the pressure and stress distribution and increase the failure risk of rolling element bearings. A numerical study of the pressure perturbation is proposed. An existing dry contact model is extended to account for the indent shoulder influence and the pressure collapse in deeper indents. Moreover, results for pure rolling lubricated contacts are presented. Finally, the ellipticity influence is studied for both dry and lubricated contacts.

Copyright © 2008 by American Society of Mechanical Engineers
Topics: Pressure
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References

Figures

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Figure 1

Indent profiles with varying decay coefficient K from 3 to 8, D=1, and Φ=1

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Figure 2

Zone A pressure and geometry (completely flattened indent)

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Figure 3

Additional pressure variations ΔP in Zone A (completely flattened indent) as a function of the indent slope D∕Φ and the decay coefficient K

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Figure 4

Ratio between the additional pressure amplitude and the indent slope ΔPtot∕(D∕Φ) in Zone A (completely flattened indents) as a function of the indent slope D∕Φ and the decay coefficient K

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Figure 5

Example of deformed indent geometry in Zone B (partially flattened indent)

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Figure 6

Ratio between deformed and initial indent depth Dd∕Di as a function of the indent slope D∕Φ

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Figure 7

Ratio between the additional pressure amplitude and the indent slope in Zone B (partially flattened indent) as a function of the indent slope D∕Φ and the decay coefficient K

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Figure 8

Full numerical additional pressure versus analytical prediction

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Figure 9

ΔP∕Pref over the shoulder for two slopes as a function of the maximum pressure abscissa XPmax for Φ=0.5

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Figure 10

Typical EHL pressure profiles for Y=0 and X=0 for Φ=0.5, K=4, M=400, and L=5

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Figure 11

Additional pressure amplitude ΔPEHL∕Pref as a function of the indent slope D∕ΦM=400L=5

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Figure 12

Pressure profile for different harmonic amplitudes

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Figure 13

Absolute additional pressure amplitude in the hole ∣ΔPcentEHL∣∕Pref as a function of DM=100–1200, L=3–19, and Φ=0.25–0.8

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Figure 14

ΔPrearEHL∕Pref versus ΔPdry∕Pref for different speeds and slopes K=4 and D∕Φ=1∕16–3∕2

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Figure 15

The geometrical approximation function ν as a function of the decay coefficient K

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