Thermomechanical fatigue (TMF) test systems adds the sophistication of performing realistic thermal cycling with mechanical fatigue testing to simulate real-world service conditions of materials and engineered components. Thermomechanical fatigue tests characterize materials response to cyclic mechanical loading with fluctuating temperature, common to high-temperature alloy component materials used in jet engines and heat exchangers, using combined in-phase and out-of-phase mechanical and thermal cycling. TMF compatible test systems include special application software that can read temperature and total strain measured by an extensometer and calculate and control mechanical strain in real-time.
ASTM E2368 covers TMF properties of metals under uniaxially loaded strain-controlled conditions. Within ASTM E2368, a fatigue cycle is considered as a condition where uniform temperature and strain fields over the specimen gage section are simultaneously varied and independently controlled. ASTM E2368 TMF tests are performed in support of such activities as materials research and development, mechanical design, process and quality control, product performance, and failure analysis.
Specifications
| Force Capacity | 25 kN - 50 kN (larger sizes available) |
| Maximum Specimen Temperature | 1,200°C (2,192°F) |
| Typical Heating Rate* | 10°C/s (18°F/s) |
| Typical Cooling Rate* | 10°C/s (18°F/s) |
| Coil Geometry | Customized for specimen gauge length, and extensometer |
| Specimen Types | Round w/ threaded ends or button head ends Hollow w/ threaded ends or button head ends |
| Induction Heater Power | 10 kW (smaller sizes available) |
| Induction Heater Frequency Range | 50 to 200 kHz at 10 kVA |
| Thermocouple Type | K |
| Number of Temperature Monitoring Channels | Up to 16 |
*Dependent on specimen material, specimen geometry, and required temperature range.
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