Abstract
In this study, the I c degradation behavior in HTS tapes due to torsional deformation was investigated. Three kinds of commercially available Bi-2223 tapes were used. The sample holder for torsion test of HTS tapes was newly devised. Utilizing it, the influence of the torsion angle on the critical current ( I c) and n-value in Ag alloy/Bi-2223 tapes was investigated at 77 K. The I c began to degrade when the torsion angle exceeded 150°, after which, it showed a gradual decrease with an increase in torsion angle. Superconducting tapes with larger number of filaments showed more significant I c degradation compared to tapes with smaller number of filaments. The n-value also showed a similar behavior to the I c( θ) behavior. Eventually, it was found that the torsion strain did not significantly reduce the critical currents of Bi-2223 tapes, when compared with cases of other loading types such as bending or tension.
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