NDLI: Ferrographic analysis of wear debris from full-scale bearing fatigue tests

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Ferrographic analysis of wear debris from full-scale bearing fatigue tests

Content Provider	NASA Technical Reports Server (NTRS)
Author	Jones Jr., W. R. Loewenthal, S. H.
Copyright Year	1979
Description	The 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.
File Size	955985
Page Count	20
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19790023434
Archival Resource Key	ark:/13960/t78s9j37w
Language	English
Publisher Date	1979-09-01
Access Restriction	Open
Subject Keyword	Mechanical Engineering Fatigue Tests Ball Bearings Ferrofluids Wear Lubrication Steels Microparticles Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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