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Applications

Rolling Bearing Stress Based Life—Part I: Calculation Model

[+] Author and Article Information
L. Houpert

F. Chevalier

 Timken Europe, B.P. 60089, Colmar, F-68002, France

J. Tribol 134(2), 021103 (Apr 16, 2012) (13 pages) doi:10.1115/1.4006135 History: Received September 12, 2011; Revised January 26, 2012; Published April 16, 2012

Rolling contact bearing life is calculated using stresses calculated at the surface and in the volume. Surface stresses account for profile and misalignment as well as asperity deformations. Sub-surface stresses are calculated beneath the asperities (for defining the life of the surface) and deeper in the volume for calculating the life of the volume. The stress-life criterion adopted is the Dang Van one in which the local stabilized shear stress is compared to the material endurance limit defined as a function of the hydrostatic pressure (itself a function of the contact pressure) but also residual stresses and hoop stresses (due to fit). A stress-life exponent c, of the order of 4 (instead of 34/3 in the standard Lundberg and Palmgren model) is used for respecting a local load-life exponent of 10/3 at typical load levels. Life of any circumferential slices of the inner, outer, and roller is defined for obtaining the final bearing life. Trends showing how the bearing life varies as a function of the applied bearing load and Λ ratio (film thickness/RMS roughness height) are given.

FIGURES IN THIS ARTICLE
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Copyright © 2012 by American Society of Mechanical Engineers
Topics: Stress , Pressure , Bearings
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References

Figures

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Figure 1

The Dang Van initial failure criterion

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Figure 2

Dang Van stress cycle submitted to any point at depth z in a Hertzian line contact

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Figure 3

The final max values of Dang Van stress criterion plotted versus depth

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Figure 4

Stress criteria beneath a pressure spike

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Figure 5

Results calculated using τyz stress instead of stabilized Dang Van shear stress

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Figure 6

The final max values of Dang Van stress criterion plotted versus depth and friction coefficient

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Figure 7

Calculated mean weighted asperity deformation

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Figure 8

The Dang Van stress criterion beneath an asperity

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Figure 9

The final Dang Van shear stress criterion used beneath an asperity

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Figure 10

Stress based life of each circumferential slice

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Figure 11

Calculated stress based life for a 41.3 mm bore bearing

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Figure 12

Calculated stress based life for a 482.6 mm bore bearing

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Figure 13

Calculated global SB factor for a 41.3 mm bore bearing

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Figure 14

Calculated global SB factor for a 482.6 mm bore bearing

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