0
Research Papers: Applications

A Comprehensive Model for Assessing the Impact of Steel Cleanliness on Bearing Performance

[+] Author and Article Information
Xiaolan Ai

Fellow ASME
The Timken Company,
North Canton, OH 44720
e-mail: xiaolan.ai@timken.com

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received February 12, 2014; final manuscript received August 26, 2014; published online October 3, 2014. Assoc. Editor: Daniel Nélias.

J. Tribol 137(1), 011101 (Oct 03, 2014) (10 pages) Paper No: TRIB-14-1043; doi: 10.1115/1.4028467 History: Received February 12, 2014; Revised August 26, 2014

Steel cleanliness as measured by nonmetallic inclusion content in steel plays a major role in affecting bearing durability. A high-fidelity virtual bearing life test model was developed to predict the impact of inclusions on bearing fatigue life. This model analyzes distributions of inclusion size, shape, orientation, and location, and computes stress alterations to bearing material due to inclusions and the resulting life reduction. Comparisons between model predictions and experimental test results were made, confirming the validity of the model. Parametric studies were conducted to explore the effects of inclusion counts, inclusion size distributions, and the effect of overall bearing size on bearing life. A regression equation was proposed based on simulation results, linking the bearing life reduction factor (LRF) to the accumulative inclusion length within the stressed volume under contact load.

FIGURES IN THIS ARTICLE
<>
Copyright © 2015 by ASME
Topics: Steel , Stress , Bearings
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

Schematic of an ellipsoidal inclusion

Grahic Jump Location
Fig. 2

Example probability density distribution of inclusion sizes for a roller bearing: (a) Outer race ring (UT code LYG) and (b) Inner race ring (UT code LYF)

Grahic Jump Location
Fig. 3

Flow lines for outer race ring for a tapered roller bearing: (a) Simulation result and (b) Experimental observation

Grahic Jump Location
Fig. 4

Local stress disturbance caused by an ellipsoidal inclusion under Hertzian contact. The semi-axes of the inclusion are 75 × 25 × 25 μm (1.96 × 10−4 mm3); the maximum Hertzian stress 1.83 GPa (nominal von Mises stress 1.01 GPa); and the half Hertzian width is 5.0 mm. (a) Cross-sectional view of von Mises disturbance; (b) Iso-surface plot of stress level above 1.28 GPa (26% above nominal); affected volume 2.47 × 10−4 mm3; and (c) Iso-surface plot of stress level above 1.06 GPa (5% above nominal); affected volume 2.27×10−3 mm3

Grahic Jump Location
Fig. 5

Stressed volume V for a roller bearing. The stressed volume includes a local domain Ωj that contains the jth inclusion.

Grahic Jump Location
Fig. 6

Simulation model structure and computational work flow

Grahic Jump Location
Fig. 14

Bearing LRF as a function of accumulative inclusion length in the stressed volume

Grahic Jump Location
Fig. 13

Bearing LRF as a function of accumulative inclusion length in the stressed volume

Grahic Jump Location
Fig. 12

Bearing LRF as a function of inclusion counts in the stressed volume

Grahic Jump Location
Fig. 11

Bearing LRF as a function of a cumulative inclusion length per unit volume

Grahic Jump Location
Fig. 10

Bearing LRF as a function of steel cleanliness measured as a cumulative inclusion length per unit volume

Grahic Jump Location
Fig. 9

Bearing life as a function of steel cleanliness measured as a cumulative inclusion length per unit volume

Grahic Jump Location
Fig. 8

Median and mean fatigue life comparison between model predictions and experimental results

Grahic Jump Location
Fig. 7

Example of MC simulation results for bearing LRF distribution, Brg ser #2, steel cleanliness level E (with UT codes LYG for outer race ring and LYF for inner race ring, respectively)

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In