Effect of mechanical loading on the I sub(c) degradation behavior of Bi-2223 tapes

During the winding process of HTS coils the tapes of Bi-2223 are subjected to the influence of bending strain, axial strain, compressive force and torsional deformation resulting in I sub(c) degradation. In the literature the effects of the individual strain components are separately analyzed in spi...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2005-01, Vol.15 (2)
Main Authors: Baldan, CA, Shigue, CY, Filho, E R, Oliveira, U R
Format: Article
Language:English
Subjects:
BENDING
Coils
DEFORMATION
Degradation
STRAIN
Superconducting tapes
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TAPE
WINDING
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Summary:During the winding process of HTS coils the tapes of Bi-2223 are subjected to the influence of bending strain, axial strain, compressive force and torsional deformation resulting in I sub(c) degradation. In the literature the effects of the individual strain components are separately analyzed in spite of during coil winding and energizing the strain-stress effects are combined. In this work using commercial tapes of Bi-2223 Ag/AgMg with and without stainless steel reinforcement several samples were wound on cylindrical FRP G-10 holder in which different combined strains are applied. Measurements of I-V characteristic curves are done to determine the degree of critical current degradation and the operational limits. The results are compared with the I sub(c) values of short samples and other specimens subjected to deformation generated by loading types such as tensile and bending strain.
ISSN:1051-8223
DOI:10.1109/TASC.2005.849357