Fatigue Behavior of Y-Ba-Cu-O/Hastelloy-C Coated Conductor at 77 K

Superconducting materials are subjected to various loading in motors, transformers, generators, and other magnet applications. The loading conditions include bending, tension, compression, and fatigue, and result from coil manufacturing, thermal cycling, quenching, and normal operation. Each of thes...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2008-09, Vol.18 (3), p.1743-1752
Main Authors: Mbaruku, A.L., Schwartz, J.
Format: Article
Language:English
Subjects:
Applied sciences
Behavior
Capacitive sensors
Coated conductors
Conducting materials
Conductors
Electric connection. Cables. Wiring
Electrical engineering. Electrical power engineering
Electrical machines
Electromagnets
electromechanical properties
Exact sciences and technology
Fatigue
fatigue effects
Manufacturing
Miscellaneous
Superconducting coils
Superconducting magnets
Superconducting materials
Superconductivity
Thermal cycling
Thermal loading
Transformers
Transformers and inductors
Various equipment and components
Y-Ba-Cu-O
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Summary:Superconducting materials are subjected to various loading in motors, transformers, generators, and other magnet applications. The loading conditions include bending, tension, compression, and fatigue, and result from coil manufacturing, thermal cycling, quenching, and normal operation. Each of these loading conditions can affect the performance of the superconductor and thus the magnet and system. It is important, therefore, to understand the electromechanical behavior of the superconducting material to optimize the design. Here we report the effects of mechanical fatigue at 77 K on the electrical transport properties of YBa 2 Cu 3 O 7-delta /Hastelloy-C coated conductors. The effects of longitudinal tensile fatigue on the critical current and the n -value are reported. Strain controlled fatigue studies include strains up to 0.495% and strain ratios of 0.2 and 0.5. Scanning electron micrographs of the fatigued conductors are used to identify the sources of failure. Crack formation is believed to be the cause of I c degradation in fatigued samples. Further, the fatigue strength and ductility behaviors analyzed using a 5% reduction in I c as the electrical definition of failure showed that the fatigue strength exponent is within the values found for metals but both the fatigue ductility coefficient and exponent show that the material tested is brittle.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2008.2003491