DS/ISO/TR 1281-2/Corr. 1:2009

Rolling bearings - Explanatory notes on ISO 281 - Part 2: Modified rating life calculation, based on a systems approach to fatigue stresses

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ISO 281:2007 introduced a life modification factor, aISO, based on a systems approach to life calculation, in addition to the life modification factor for reliability, a1.These factors are applied in the modified rating life equation Lnm= a1aISOL10 (1)
For a range of reliability values, a1 is given in ISO 281:2007 as well as the method for evaluating the
modification factor for systems approach, aISO. L10 is the basic rating life.
This part of ISO/TR 1281 gives supplementary background information regarding the derivation of a1 and aISO.
NOTE – The derivation of aISO is primarily based on theory presented in Reference [5], which also deals with the fairly complicated theoretical background of the contamination factor, eC, and other factors considered when calculating aISO .

Number of pages: 8

Published: 2009-12-11

Date of approval: 2009-11-04

International relationships : ISO/TR 1281-2:2008/Cor 1:2009 IDT

ICS: 21.100.20 - Rolling bearings

Item number: M243329



  • ISO/TC 4/SC 8/WG 6

Danish committee