1 Scope
This standard specifies the equipment, sample, test procedure, treatment of test result and test report, etc. for the axial loading constant-amplitude low-cycle fatigue test of metallic materials.
This standard is applicable to the low-cycle fatigue tests of funnel-like samples that are made of metallic materials and with equal section in case of bearing axial constant-amplitude stress or strain, excluding the test of full-size component and structural member, and also applicable to the tests carried out at lower or equal temperature and strain rate than those of time-dependent inelastic strain and time-independent inelastic strain. It is permitted to conduct test under such environmental factors as temperature, pressure, humidity and media, which, however, shall remain constant during the entire test.
Note: this standard may serve as a guideline for low-cycle fatigue test in material development, mechanical design, technology and quality control, product performance determination and failure analysis.
2 Normative References
The following documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated references, subsequent amendments to (excluding corrections), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest editions of these documents are applicable. For undated references, the latest editions apply.
GB/T 10623 Metallic Materials—Terms of Mechanical Test
GB/T 12160 Calibration of Extensometers Used in Uniaxial Testing
JJG 556 Verification Regulation of Axial Force Fatigue Testing Machines
3 Symbols
See Table 1 for symbols, names and units used in this standard and explanations.
Foreword I
1 Scope
2 Normative References
3 Symbols
4 Terms and Definitions
5 Apparatus
6 Sample
7 Test Procedure
8 Treatment of Test Results
9 Test Report
Appendix A (Informative) Functional Relation
Appendix B (Informative) Conversion of Radial Strain to Axial Strain for Isotropic Materials
Appendix C (Informative) Example for Sample Machining Method
Appendix D (Informative) High Temperature Test with Hold Period
