Fatigue tests (tension-tension, compression-compression and strain controlled tension-compression) in liquid nitrogen is possible with the 900 Series servo hydraulic load frames configured with a liquid nitrogen LN2 cryostat. The system consists of a dual column servo hydraulic test machine with the actuator placed in the adjustable height crosshead. A large LN2 cryogenic dewar is located under the actuator. Prior to submersion, a test sample is gripped and a special low temperature extensometer mounted. The frame includes a sub frame located below the actuator so that the loads are reacted against inside the test environment. During setup, the crosshead is lowered, with actuator extended until the subframe is submerged in the media. The cryostat is modular and can be removed with a conventional low temperature chamber (rated -185C) replacing it. Specially engineered grips are required for low cycle fatigue strain controlled tests in LN2.
Applicable Testing Standards
- ASTM E8 Tension Testing of Metallic Materials
- ASTM E9 Compression Testing of Metallic Materials at Room Temperature
- ASTM E466 Load Controlled Constant Amplitude Fatigue Tests of Metals
- ASTM E606 Strain-Controlled High and Low Cycle Fatigue Testing
Recommended Test Machine
>Load ratings from 100 kN to 5 MN (22,500 lbf to 1,125,000 lbf)
Servohydraulic
Can perform both static and dynamic tests
Recommended Testing Accessories
Load ratings from 50 kN to 300 kN (11,250 lbf to 67,500 lbf)
Hydraulic actuation
Designed to cycle dynamically through zero-load
Temperature ratings up to 1,000°C (1,800°F)
Measures displacement for axial tensile, compression, and cyclic testing
Gage lengths from 10 mm to 50 mm (0.5 in to 2.0 in)
Measuring ranges from 5% to 100% strain
Lightweight and self-supporting
Maximum operating temperature options of 500°C or 1200°C (930°F or 2,200°F)
Minimum operating temperature of 300°C (570°F)
PID controlled temperature
Utilizes 120 V or 240 V power
Standard temperature range of -155°C to 620°C (-247°F to 1150°F)
Accompanied by a broad set of accessories that are capable of withstanding the heat or cold
PID controlled internal temperature
Mounts directly to the test frame
Allows for testing in temperature-controlled water or saline solution
PID controlled temperature up to 45°C (113°F)
Size is optimized per application
Accompanied by a broad set of accessories that are designed for biomedical baths