Affiliation:
1. Korea Electrotechnology Research Institute
2. Nexans Korea Ltd.
3. Sungkyunkwan University
Abstract
Bi-2223/Ag tapes are usually used for superconducting power cables and magnets. Bi-
2223 ceramic superconducting core can be damaged under complicated stress and strain conditions
such as winding tension, bending and twisting. In this study, we have presented the effect of axial
stress and bending strain on the superconducting properties of Bi-2223/Ag tapes. In order to
establish the value for 95% retained Ic of the Bi-2223/Ag tapes under various stress-strain
conditions, the tension apparatus with bending former was used to apply the tension and bending
stress-strain. Tension and bending stress-strain simultaneously applied to the tapes could reduce the
critical current even though each applied stress and strain values were not higher than that of 95%
retained Ic of the tapes. Complex stress-strain conditions including the thermal stress-strain have
accelerated the degradation of the Bi-223/Ag tapes. The deformation temperature was important to
maintain the 95% retained Ic of the Bi-2223/Ag tapes after bending or tension deformation because
mechanical strength of the tapes can be changed drastically between room temperature and 77 K.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science