1 Scope
This standard specifies the fatigue testing standard for helical springs under variable load.
This standard is applicable to fatigue life verification and reliability evaluation of helical compression and tension springs (hereinafter referred to as springs), and it can be used as a reference for other spring products under variable load.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard, however parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 23935 Design of cylindrical helical springs
GB/T 1805 Nomenclature of springs
3 Terms, definitions and symbols
For the basic terms of springs, those specified in GB/T 1805 shall apply. See Figure 1 and Table 1 for the terms, definitions, symbols and units related to fatigue testing.
Foreword i
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Testing requirements
5 Specimen spring
6 Testing conditions
7 Testing procedure
8 Testing data processing and result evaluation
Annex A (Informative) Reference table for number of cyclic action
Annex B (Informative) Table for estimation and calculation of reliability R
Annex C (Informative) Data record of fatigue testing
