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Tracking of Spall Deterioration on Tapered Roller Bearings

[+] Author Affiliations
Amy Gonzalez, Constantine Tarawneh

University of Texas-Pan American, Edinburg, TX

Ping Hu, Joseph A. Turner

University of Nebraska-Lincoln, Lincoln, NE

Brent M. Wilson

Amsted Rail Company, Granite City, IL

Paper No. JRC2015-5793, pp. V001T06A019; 9 pages
doi:10.1115/JRC2015-5793
From:
  • 2015 Joint Rail Conference
  • 2015 Joint Rail Conference
  • San Jose, California, USA, March 23–26, 2015
  • Conference Sponsors: Rail Transportation Division
  • ISBN: 978-0-7918-5645-1
  • Copyright © 2015 by ASME

abstract

Fatigue spall initiation is one of the major modes of premature bearing failure. The spall initiation is often exacerbated by the presence of impurities in the near-surface region (∼400 μm) of the bearing raceways. Once a spall initiates, it can propagate rapidly, leading to abnormal bearing operation and possible catastrophic failure if not detected early. Testing performed at the University of Texas-Pan American (UTPA) has focused on ultrasonically scanned tapered roller bearings found to have inclusion content within 400 μm of the surface of the raceways. These bearings undergo accelerated service life tests in which spall initiation is detected and tracked over time while documenting spall growth. The work presented here provides several study cases that document the spall initiation and propagation on ultrasonically scanned tapered roller bearing components. Results show that spalls generally initiate on locations corresponding to sites of subsurface inclusions, and they grow many times their original size within relatively short operating periods. The study also shows that spalls tend to initiate and propagate at a faster rate on bearing cups (outer rings) than on cones (inner rings).

Copyright © 2015 by ASME

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