ISO 12106:2017
Metallic materials — Fatigue testing — Axial-strain-controlled method
ISO 12106:2017 specifies a method of testing uniaxially deformed specimens under strain control at constant amplitude, uniform temperature and fixed strain ratios including at Re = −1 for the determination of fatigue properties. It can also be used as a guide for testing under other R-ratios, as well as elevated temperatures where creep deformation effects may be active.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
4.1 Specimens
4.2 Fatigue testing
4.2.1 Symbols
4.2.2 Subscripts
4.3 Expression of results
5 Apparatus
5.1 Test machine
5.1.1 General
5.1.2 Force transducer
5.1.3 Gripping of specimen
5.1.4 Alignment check
5.2 Strain measurement
5.3 Heating device and temperature measurement
5.4 Instrumentation for test monitoring
5.4.1 Recording systems
5.4.2 Cycle counter
5.5 Checking and verification
6 Specimens
6.1 Geometry
6.1.1 Round bars
6.1.2 Flat sheet products
6.2 Preparation of specimens
6.2.1 General
6.2.2 Machining procedure
6.2.3 Sampling and marking
6.2.4 Surface condition of specimen
6.2.5 Dimensional check
6.2.6 Storage and handling
7 Procedure
7.1 Laboratory environment
7.2 Test machine control
7.3 Mounting of the specimen
7.4 Cycle shape — Strain rate or frequency of cycling
7.5 Start of test
7.5.1 Preliminary measurements
7.5.2 Test commencement
7.6 Number of specimens
7.7 Data recording
7.7.1 Stress-strain hysteresis loops
7.7.2 Data acquisition
7.8 End of test
7.9 Failure criteria
8 High-temperature strain-controlled creep-fatigue testing
9 Expression of results
9.1 Basic data (recorded data (see 7.7))
9.2 Analysis of low-cycle fatigue results at Re = −1
9.2.1 Distinction between different types of strain values
9.2.2 Determination of fatigue life (see 7.9)
9.2.3 Stress-strain and strain-fatigue life relationships
9.3 Analysis of creep-fatigue results
10 Test report
10.1 General
10.2 Purpose of the test
10.3 Material
10.4 Specimen
10.5 Test methods
10.6 Test conditions
10.7 Presentation of results
10.7.1 Presentation of single test results
10.7.2 Presentation of results of test series
10.8 Values to be stored in a low-cycle fatigue database
Annex A (informative) Measurement uncertainty
Annex B (informative) Examples of graphical presentation of results
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
4.1 Specimens
4.2 Fatigue testing
4.2.1 Symbols
4.2.2 Subscripts
4.3 Expression of results
5 Apparatus
5.1 Test machine
5.1.1 General
5.1.2 Force transducer
5.1.3 Gripping of specimen
5.1.4 Alignment check
5.2 Strain measurement
5.3 Heating device and temperature measurement
5.4 Instrumentation for test monitoring
5.4.1 Recording systems
5.4.2 Cycle counter
5.5 Checking and verification
6 Specimens
6.1 Geometry
6.1.1 Round bars
6.1.2 Flat sheet products
6.2 Preparation of specimens
6.2.1 General
6.2.2 Machining procedure
6.2.3 Sampling and marking
6.2.4 Surface condition of specimen
6.2.5 Dimensional check
6.2.6 Storage and handling
7 Procedure
7.1 Laboratory environment
7.2 Test machine control
7.3 Mounting of the specimen
7.4 Cycle shape — Strain rate or frequency of cycling
7.5 Start of test
7.5.1 Preliminary measurements
7.5.2 Test commencement
7.6 Number of specimens
7.7 Data recording
7.7.1 Stress-strain hysteresis loops
7.7.2 Data acquisition
7.8 End of test
7.9 Failure criteria
8 High-temperature strain-controlled creep-fatigue testing
9 Expression of results
9.1 Basic data (recorded data (see 7.7))
9.2 Analysis of low-cycle fatigue results at Re = −1
9.2.1 Distinction between different types of strain values
9.2.2 Determination of fatigue life (see 7.9)
9.2.3 Stress-strain and strain-fatigue life relationships
9.3 Analysis of creep-fatigue results
10 Test report
10.1 General
10.2 Purpose of the test
10.3 Material
10.4 Specimen
10.5 Test methods
10.6 Test conditions
10.7 Presentation of results
10.7.1 Presentation of single test results
10.7.2 Presentation of results of test series
10.8 Values to be stored in a low-cycle fatigue database
Annex A (informative) Measurement uncertainty
Annex B (informative) Examples of graphical presentation of results
Bibliography