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The Effect of ODC-Free Cleaning Techniques on Bearing Lifetimes in the Parched Elastohydrodynamic RegimeA parched elastohydrodynamic rig was used to determine relative bearing lifetimes as a function of cleaning procedures in a series of accelerated tests. Two ODC-free cleaning procedures (super critical CO2 and ultraviolet-ozone) were compared to a CFC-113 control. Bearings (52100 steel) were run in the counter rotating mode (equivalent to 4600 rpm) with a full complement (i.e. no retainer) and a single charge of lubricant (Krytox 143 AC). Test conditions included: an air atmosphere, 445N load, approx. 1.0 GPa mean Hertz stress. There was approximately a 50% reduction in life with bearings cleaned with UV/ozone and a 70% reduction in life with SFE CO2 when compared to the Freon control. Possible reasons for these decreases in lifetimes are presented.
Document ID
Document Type
Conference Paper
Jones, William R., Jr.
(NASA Lewis Research Center Cleveland, OH United States)
Toddy, Thomas J.
(NASA Lewis Research Center Cleveland, OH United States)
Predmore, Roamer
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Shogrin, Bradley
(Case Western Reserve Univ. Cleveland, OH United States)
Herrera-Fierro Pilar
(Ohio Aerospace Inst. Cleveland, OH United States)
Date Acquired
August 17, 2013
Publication Date
March 1, 1997
Publication Information
Publication: Second Aerospace Environmental Technology Conference
Subject Category
Engineering (General)
Distribution Limits
Work of the US Gov. Public Use Permitted.
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