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Applications

Rolling Bearing Stress Based Life—Part II: Experimental Calibration and Validation

[+] Author and Article Information
J. Gnagy

 The Timken Company, 1835 Dueber Avenue Southwest, P.O. Box 6930, Canton, OH 44706-0930

L. Houpert1

F. Chevalier

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

1

Corresponding author.

J. Tribol 134(2), 021104 (Apr 16, 2012) (8 pages) doi:10.1115/1.4006136 History: Received September 12, 2011; Revised February 03, 2012; Published April 16, 2012

The stress based life model described in Paper I was calibrated using a large database of experimental results from a global quality audit test program as well as special development tests conducted for this validation effort. All tests used in the calibration of the new model were case carburized or through hardened tapered roller bearings. The initial model comparison to test results showed very good correlation with a median ratio of test life to calculated life very close to one. Higher accuracy of the stress based model compared to the traditional factor based method was also demonstrated by narrower confidence bands (less data scatter). Validation testing of case carburized tapered roller bearings as well as through hardened spherical roller bearings was also conducted under expanded test conditions beyond those utilized in the quality audit test program (i.e., high and low load, high and low λ, imposed misalignment, and heavy inner ring interference fits). Although the median ratio of relative life for the validation testing showed the stress based method to be conservative and well above one, the stress based method still showed better accuracy than the traditional factor based method as well as narrower confidence bands for this additional body of experimental data. The conservative results can be explained by use of high quality steel and manufacturing processes in a prototype facility and not series production equipment as was the case with the quality audit database.

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References

Figures

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Figure 1

First-in-four tapered roller bearing testing scheme utilized for audit type fatigue life tests under radial load

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Figure 2

First-in-four tapered roller bearing testing scheme utilized for audit type fatigue life tests under pure thrust load

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Figure 3

Comparison of factor based and stress based methods for audit and development tests using case carburized tapered roller bearings

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Figure 4

Comparison of factor based and stress based methods for audit through hardened tapered roller bearing tests

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Figure 5

Comparison of factor based and stress based methods for M802000 series tapered roller bearing test campaign

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Figure 6

M802000 series test campaign trend results

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Figure 7

First-in-four testing scheme used for spherical roller bearing test campaign and audit tests

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Figure 8

Comparison of factor based and stress based methods for 22212 validation and audit spherical roller bearing tests

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Figure 9

Comparison of factor based and stress based methods for all bearing tests

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