ISO 23296:2022
Metallic materials – Fatigue testing – Force controlled thermo-mechanical fatigue testing method
This document applies to stress and/or force-controlled thermo-mechanical fatigue (TMF) testing. Both forms of control, force or stress, can be applied according to this document. This document describes the equipment, specimen preparation, and presentation of the test results in order to determine TMF properties.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Test methods
4.1 Apparatus
4.1.1 Testing machine
4.1.2 Testing machine calibration
4.1.3 Cycle counting
4.1.4 Waveform generation and control
4.1.5 Force measuring system
4.1.6 Test fixtures
4.1.7 Alignment verification
4.1.8 Heating device
4.1.9 Cooling device
4.2 Specimens
4.2.1 Geometry
4.2.2 Specimen preparation
4.2.3 Specimen measurement
4.2.4 Circular or rectangular sections
4.2.5 Sampling, storage and handling
4.2.6 Specimen insertion
4.2.7 Thermocouple attachment
4.2.8 Spot welding of thermocouples
4.2.9 Heating the specimen
4.2.10 Cooling the specimen
5 Test preparatory issues
5.1 Temperature measurement
5.1.1 General
5.1.2 Temperature control
5.2 Verification of temperature uniformity - Thermal profiling
5.2.1 General
5.2.2 Maximum permissible temperature variation along the specimen
5.2.3 Data recorders
5.2.4 Furnace positioning
5.3 Force waveform optimisation
5.4 Temperature force optimisation
5.5 The application of an extensometer to measure maximum and minimum mechanical strain to observe the effects of ratcheting
6 Test execution
6.1 Test start
6.1.1 General
6.1.2 Data recording
6.1.3 Test termination
6.1.4 Test validity
6.1.5 During the test
6.2 Test monitoring
6.3 Termination of test
6.3.1 General
6.3.2 Accuracy of control parameters
7 Analysis and reporting
7.1 Validation of analysis software
7.2 Test report
7.2.1 General
7.2.2 Essential information
7.2.3 Additional information
7.2.4 Examination of fracture surface
Annex A (informative) Guidelines on specimen handling and degreasing
Annex B (informative) Thermocouple arrangement for a specimen containing a notch feature
Annex C (informative) Thermal imaging for thermal profiling
Annex D (informative) Measurement of strain during force controlled TMF testing
Annex E (informative) Measurement uncertainty
Bibliography
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Related Information
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Test methods
4.1 Apparatus
4.1.1 Testing machine
4.1.2 Testing machine calibration
4.1.3 Cycle counting
4.1.4 Waveform generation and control
4.1.5 Force measuring system
4.1.6 Test fixtures
4.1.7 Alignment verification
4.1.8 Heating device
4.1.9 Cooling device
4.2 Specimens
4.2.1 Geometry
4.2.2 Specimen preparation
4.2.3 Specimen measurement
4.2.4 Circular or rectangular sections
4.2.5 Sampling, storage and handling
4.2.6 Specimen insertion
4.2.7 Thermocouple attachment
4.2.8 Spot welding of thermocouples
4.2.9 Heating the specimen
4.2.10 Cooling the specimen
5 Test preparatory issues
5.1 Temperature measurement
5.1.1 General
5.1.2 Temperature control
5.2 Verification of temperature uniformity - Thermal profiling
5.2.1 General
5.2.2 Maximum permissible temperature variation along the specimen
5.2.3 Data recorders
5.2.4 Furnace positioning
5.3 Force waveform optimisation
5.4 Temperature force optimisation
5.5 The application of an extensometer to measure maximum and minimum mechanical strain to observe the effects of ratcheting
6 Test execution
6.1 Test start
6.1.1 General
6.1.2 Data recording
6.1.3 Test termination
6.1.4 Test validity
6.1.5 During the test
6.2 Test monitoring
6.3 Termination of test
6.3.1 General
6.3.2 Accuracy of control parameters
7 Analysis and reporting
7.1 Validation of analysis software
7.2 Test report
7.2.1 General
7.2.2 Essential information
7.2.3 Additional information
7.2.4 Examination of fracture surface
Annex A (informative) Guidelines on specimen handling and degreasing
Annex B (informative) Thermocouple arrangement for a specimen containing a notch feature
Annex C (informative) Thermal imaging for thermal profiling
Annex D (informative) Measurement of strain during force controlled TMF testing
Annex E (informative) Measurement uncertainty
Bibliography