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Ferrographic analysis of wear debris from full-scale bearing fatigue testsThe Ferrograph was used to determine the types and quantities of wear particles generated during full scale bearing fatigue tests. Deep-groove ball bearings made from steel were used. A tetraester lubricant was used in a recirculating lubricant system containing a 49 micrometers absolute filter. Test conditions include a maximum Hertz stress of 2.4 GPa, a shaft speed of 15,000 rpm, and a lubricant supply temperature of 74 C (165 F). Four fatigue failures were detected by accelerometers in this test set. In general, the Ferrograph was more sensitive (up to 23 hr) in detecting spall initiation than either accelerometers or the normal spectrographic oil analysis. Four particle types were observed: normal rubbing weather particles, spheres, nonferrous particles, and severe wear (spall) fragments.
Document ID
19790023434
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Jones, W. R., Jr. (NASA Lewis Research Center Cleveland, OH, United States)
Loewenthal, S. H. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 3, 2013
Publication Date
September 1, 1979
Subject Category
Mechanical Engineering
Report/Patent Number
E-9827
NASA-TP-1511
Accession Number
79N31605
Funding Number(s)
PROJECT: RTOP 505-04
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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