Inclusions and Service Induced Cracks in a Mature Population of Gas Turbine Engine Bearings

[+] Author and Article Information
J. R. Barton, F. N. Kusenberger, B. B. Baber

Southwest Research Institute, San Antonio, Texas 78284

J. of Lubrication Tech 104(3), 300-308 (Jul 01, 1982) (9 pages) doi:10.1115/1.3253202 History: Received April 07, 1981; Online November 13, 2009


Comprehensive NDE data have been acquired on approximately 1000 main shaft ball bearings used in J57/TF33 gas turbine engines by processing through the Automated Bearing Inspection System, Mark I CIBLE. Bearing service hours ranged from zero (new) to approximately 13,000 hr; inclusions and service induced cracks were detected in a significant number of components. Endurance testing as well as metallurgical sectioning and scanning electron microscope investigations were used in correlation analyses. A linear extrapolation to the total service population of J57/TF33 #2 bearing position results in a forecast of over 200 cracked bearings in the fleet of B52, KC135, C141, and E3A aircraft that use these engines.

Copyright © 1982 by ASME
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