ISO - TR 1281-2
Rolling bearings — Explanatory notes on ISO 281 — Part 2: Modified rating life calculation, based on a systems approach to fatigue stresses
|Publication Date:||1 December 2008|
|ICS Code (Rolling bearings):||21.100.20|
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 , which also deals with the fairly complicated theoretical background of the contamination factor, eC, and other factors considered when calculating aISO .