GB/T 26077-2021 in English
VALIDMetallic materials—Fatigue testing—Axial-strain-controlled method
- Issued on:2021-04-30
- Implemented on:2021-11-01
- File Format:PDF
- Delivery:Via email within 5 business days
Price(USD)：
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$563.00
$563.00
《GB/T 26077-2021金属材料 疲劳试验 轴向应变控制方法》由TC183（全国钢标准化技术委员会）归口，TC183SC4（全国钢标准化技术委员会力学及工艺性能试验方法分会）执行，主管部门为中国钢铁工业协会。
Introduction
Analysis of the core content of the standard
Major changes in the new standard: New definition of engineering stress/parallel length, strengthened coaxiality inspection requirements, improved high-temperature creep-fatigue test chapter, and the control accuracy of the testing machine was increased to ±1%.
Key technical requirements of test equipment
| System components | Technical requirements | Calibration specifications |
|---|---|---|
| Fatigue testing machine | Coaxiality ≤5%, lateral stiffness anti-buckling | GB/T34104 |
| Force sensor | First-level accuracy, temperature drift ≤0.002%/℃ | GB/T16825.1 |
| Extensometer | Dynamic measurement, gauge error ±0.5% | GB/T12160 |
Specimen preparation specifications
Typical case: The processing of a titanium alloy specimen for aviation needs to control Ra < 0.2μm. The final process uses longitudinal polishing to avoid circumferential scratches, and the specimen is cooled under inert gas protection after heat treatment.
- Circular specimen: Diameter 5-10mm, transition radius ≥2d, parallel length 2d-4d
- Plate specimen: Anti-buckling device is required when thickness >2.5mm, friction effect ≤2% test force
- Surface treatment: Grinding allowance ≤0.1mm, polishing sandpaper gradually refined to Ra <0.2μm
Key points of high temperature creep-fatigue test
Note: The temperature gradient must be controlled within 3℃. It is recommended to use three thermocouples to monitor the temperature distribution of the gauge section.
- Strain dwell time varies from minutes to hundreds of hours
- Stress relaxation curve and creep strain need to be recorded
- Measure the thermal expansion coefficient of the material before the test (deviation ≤5%)
Comparison of key technologies between the new and old standards
| Technical elements | GB/T26077-2010 | GB/T26077-2021 |
|---|---|---|
| Coaxiality test | Specify the method by yourself | Mandatory adoption of GB/T34104 |
| High temperature test | No special chapter | New Chapter 8 Creep-fatigue test |
| Control accuracy | Not clearly quantified | Strain control ±1%, force control ±1% |
Implementation recommendations
Laboratory construction: It is recommended to configure a dual-channel extensometer system, adopt a digital servo control system, and have a sampling frequency of ≥200 points/cycle. The test environment needs to control the temperature fluctuation to ±2℃ and the humidity to <60%RH.
Data acquisition strategy
- Continuously record the hysteresis loop for the first 10 cycles
- Subsequently collect data at logarithmic intervals (20,50,100... cycles)
- Keep cross-section micrographs when completely broken
Sample only — not a preview of GB/T 26077-2021
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