WD Structural integrity of Superconducting Devices
Magneto-cryogenic materials testing system
Magnetic field distribution around fatigue crack tip in a cryogenic material at 77K (upper) and 239K (lower), measured with a SQUID.
Structural materials in applications such as superconducting generator are used at cryogenic temperatures and subject to high magnetic fields.
An understanding of their fracture mechanics is important in order to ensure the structural integrity of these devices.
In this project, techniques for evaluating material properties at high magnetic fields and low temperatures (6T, 4K) have been developed. The effects of test temperature and high magnetic field on fracture properties are under investigation using fractography, and high sensitivity SQUID magnetic field sensors are used for non-destructive testing. These techniques allow monitoring and analysis of fatigue damage and cracking in superconductors.
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