GB/Z 32332.2-2015Rolling bearings - Explanatory notes on ISO 281 - Part 2: Modified rating life calculation, based on a systems approach to fatigue stresses (English PDF)
滚动轴承 对ISO 281的注释 第2部分：基于疲劳应力系统方法的修正额定寿命计算
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 31, 2015
Implementation date
December 31, 2015
Scope
GB/Z 32332.2-2015 is the English-translated version of 滚动轴承 对ISO 281的注释 第2部分：基于疲劳应力系统方法的修正额定寿命计算.
GB/Z 32332.2-2015 is the Chinese standard "Rolling bearings - Explanatory notes on ISO 281 - Part 2: Modified rating life calculation, based on a systems approach to fatigue stresses".
Its scope clause reads: In addition to the reliability life correction factor a1, ISO 281.2007 also incorporates a life-time correction factor aISO . These coefficients are used in amending the nominal life formula.
Lnm = a1aISO L10 (1) ISO 281.2007 gives the value of a1 for a range of degrees of reliability and for the estimation of aISO based on the systematic method of correction law.
L10 is the basic rated life. This section GB /Z 32332 gives additional background information on the derivation of a1 and aISO . Note.
The derivation of aISO is based primarily on the theory presented in [5], which also deals with the equivalence of the pollution coefficient eC to other factors considered when aISO is calculated Complex theoretical background. Its clauses include symbol.
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Document preview — GB/Z 32332.2-2015
National Standard of the People's Republic of China
- ICS
- 21.100.20
- Classification
- J 11
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 symbol
- 4 reliability life correction coefficient a1
- 4.1 General
- 4.2 Derivation of reliability of life correction factor
- 5 life correction factor aISO background
- 5.1 General
- 5.2 Lubrication coefficient etab
- 5.3 Pollution coefficient etac
- 5.4 Test Results
- 5.5 Conclusion
- 5.6 According to the literature [5] formula (19.a), the practical application of pollution coefficient
- 5.7 Differences between the life correction factors in [5] and ISO 281
- 6.1 General
- 6.2 After filtering oil line
- 6.3 oil bath
- 6.4 oil mist pollution factor of
- 7.1 Common definitions
- 7.2 Wear abrasive
- 7.3 slight wear
- 7.4 Wear on the fatigue life of
- 7.5 Fatigue with less effect on fatigue life
- 7.6 Adhesive wear
- 8.1 General
- 8.2 hydrogen on the impact of reduced life
- 8.3 Corrosion
- 9 sets of bearings fatigue load limit
- 10.1 Hoop stress
- 10.2 Temperature
- 10.3 Contamination Particle hardness
- 11.1 Viscosity ratio kappa
- 11.2 Oil film thickness and the ratio of the integrated surface roughness Lambda
- References
1 Scope
In addition to the reliability life correction factor a1, ISO 281.2007 also incorporates a life-time correction factor aISO . These coefficients are used in amending the nominal life formula.
Lnm = a1aISO L10 (1)
ISO 281.2007 gives the value of a1 for a range of degrees of reliability and for the estimation of aISO based on the systematic method of correction law. L10 is the basic rated life.
This section GB /Z 32332 gives additional background information on the derivation of a1 and aISO .
Note. The derivation of aISO is based primarily on the theory presented in [5], which also deals with the equivalence of the pollution coefficient eC to other factors considered when aISO is calculated
Complex theoretical background.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 6391-2010 Rolling bearings, rated dynamic load and rated life (ISO 281.2007, IDT)
ISO 11171 hydraulic drive fluid automatic particle counter calibration (Hydraulicfluidpower-Calibrationofauto- maticparticlecountersforliquids)
3 symbol
The following symbols apply to this document. Some other symbols are specifically defined in the chapter or article they are used.
A. Proportional constant in the life formula derivation aISO . Lifetime correction factor based on life-cycle calculation system approach aSLF. The stress-life-span coefficient of the life-based computing system approach in [5] (as compared to the life-time correction coefficient aISO in ISO 281 with) a1. reliability life correction factor
C. Basic dynamic load rating, N.
Cu. Fatigue load limit, N.
C0. Basic static load rating, N c. Index in stress-life formula (c = 31/3 in [5] and ISO 281)
Dpw. Ball or roller set pitch diameter, mm dV. Integral unit of volume, mm3 e Weibull index (ball bearings 10/9, 9/8 roller bearings) eC. Pollution coefficient
Fr. Bearing radial load (bearing radial load component), N.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 35 pages — is available in the English PDF.
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