NDLI: Relation between hertz stress-life exponent, ball-race conformity, and ball bearing life (Document No: 20080010684)

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Relation between hertz stress-life exponent, ball-race conformity, and ball bearing life (Document No: 20080010684)

Content Provider	NASA Technical Reports Server (NTRS)
Author	Root, Lawrence E. Poplawski, Joseph V. Zaretsky, Erwin V.
Copyright Year	2008
Description	ANSI/ABMA and ISO standards based on Lundberg-Palmgren bearing life theory are normalized for ball bearings having inner- and outerrace conformities of 52 percent (0.52) and made from pre-1940 bearing steel. The Lundberg-Palmgren theory incorporates an inverse 9th power relation between Hertz stress and fatigue life for ball bearings. The effect of race conformity on ball set life independent of race life is not incorporated into the Lundberg-Palmgren theory. In addition, post-1960 vacuum-processed bearing steel exhibits a 12th power relation between Hertz stress and life. The work reported extends the previous work of Zaretsky, Poplawski, and Root to calculate changes in bearing life--that includes the life of the ball set--caused by race conformity, Hertz stress-life exponent, ball bearing type and bearing series. The bearing fatigue life in actual application will usually be equal to or greater than that calculated using the ANSI/ABMA and ISO standards that incorporate the Lundberg-Palmgren theory. The relative fatigue life of an individual race is more sensitive to changes in race conformity for Hertz stress-life exponent n of 12 than where n = 9. However, when the effects are combined to predict actual bearing life for a specified set of conditions and bearing geometry, the predicted life of the bearing will be greater for a value of n = 12 than n = 9.
File Size	475570
Page Count	25
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20080010684
Archival Resource Key	ark:/13960/t5dc30z49
Language	English
Publisher Date	2008-01-01
Access Restriction	Open
Subject Keyword	Mechanical Engineering Fatigue Life Sensitivity Accelerators Ball Bearings Reliability Analysis Grooves Steels Cross Sections Stress Measurement Tribology 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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