PD ISO/TR 10771-2:2008

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Selection of material factors
5 Determination of cyclic test pressure
6 Conduct of fatigue test
7 Rating by similarity
8 Rating declaration
9 Identification statement (reference to this part of
  ISO 10771)
Annex A (informative) - Material factor database
  A.1 Values of coefficient of variation, k[o],
      for commonly used metals
  A.2 Procedures used to establish values of coefficient
      of variation, k[o], for the metals listed in
      Table A.1
Annex B (normative) - Calculation of variability factor K[V]
  B.1 General
  B.2 Method
Annex C (informative) - Proposal for an acceleration factor
  C.1 General
  C.2 Extrapolating data to 10[7] cycles
  C.3 Examples
Annex D (informative) - Basis of fatigue pressure rating [9]
  D.1 Basis of pressure rating
  D.2 Statistical analysis theory
  D.3 Fatigue distribution data
  D.4 Data calculation example
  D.5 Raw data points for sample problem
Bibliography

Describes a test method for fatigue rating of the pressure-containing envelopes of components used in hydraulic fluid power systems, as tested under steady internal cyclic pressure loads in accordance with ISO 10771-1.

This part of ISO10771 specifies a test method for fatigue rating of the pressure-containing envelopes of components used in hydraulic fluid power systems, as tested under steady internal cyclic pressure loads in accordance with ISO10771-1.

This part of ISO10771 is only applicable to components whose failure mode is the fatigue of any element in the pressure-containing envelope, and that:

• are manufactured from metals;

• are operated at temperatures that exclude creep and low-temperature embrittlement;

• are only subjected to pressure-induced stresses;

• are not subjected to loss of strength due to corrosion or other chemical action;

• can include gaskets, seals and other non-metallic components; however, these are not considered part of the pressure-containing envelope being tested (see note3 of 5.5 of ISO10771-1:2002).

This part of ISO10771 does not apply to piping as defined in ISO4413 (i.e. connectors, hose, tubing, pipe).

NOTE See ISO19879, ISO6803 and ISO6605 for methods of fatigue testing of tube connectors, hoses and hose assemblies.

This part of ISO10771 establishes a general rating method that can be applied to many hydraulic fluid power components. In addition, EN14359 has been developed for accumulators.