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Development of a load frame for neutron diffraction and fluorescent thermometry at cryogenic temperature
Jinbo Yang1, Jian Li2, Wei Liu3
1Key Laboratory of Mechanics on Disaster and Environment in Western China Attached to the Ministry of Education of China, Lanzhou University, Lanzhou, Gansu 730000, China.
The Review of Scientific Instruments
|August 3, 2022
Summary
A new cryogenic load frame enables in situ mechanical testing for materials science research. This system allows for precise measurement of internal stress and temperature distribution at cryogenic temperatures (6-300 K).
Area of Science:
- Materials Science
- Mechanical Engineering
- Cryogenics
Background:
- Growing demand for understanding material behavior at low temperatures due to expanding cryogenic applications in space, environmental, and superconductivity engineering.
- Critical need for in situ measurement of internal strain, full-field strain, and temperature distribution in cryogenic environments for safety and research.
Purpose of the Study:
- To present a novel cryogenic load frame designed for in situ mechanical testing and neutron scattering measurements.
- To enable precise characterization of material properties under cryogenic loading conditions.
Main Methods:
- Development of a cryogenic load frame with a 2500 N capacity and adjustable loading speed (0.001 mm/s).
- Integration of a K9 glass window for in situ digital image correlation (DIC) strain measurements.
- Incorporation of fluorescence thermometry for temperature distribution analysis during thermal cycling.
Main Results:
- Demonstrated capability for in situ neutron scattering measurements of internal stress from 6-300 K.
- Successful implementation of DIC for full-field strain measurement in a cryogenic environment.
- Validation of fluorescence thermometry for accurate temperature monitoring.
Conclusions:
- The novel cryogenic load frame effectively supports in situ mechanical property evaluation of materials at low temperatures.
- The integrated DIC and fluorescence thermometry systems provide comprehensive data for materials research in cryogenic applications.
- The system was successfully utilized to analyze 316LN stainless steel and YBCO tape performance at low temperatures.
