Critical property of Ba-122 Iron-based tapes under torsional
In order to promote the practical development of iron-based superconducting tape,a pure torsion test device for iron-based superconducting tape was developed in this paper.The critical properties of 7-filamentary(Ba-122)tape was an-alyzed under torsional strain.The critical current of tape decreases under torsional strain and decreases with the increase of tor-sional strain.The measurement results of four pairs of voltage signals are consistent,indicating uniform torsion deformation.With 95％initial critical current as the critical torsion standard,the critical torsion angle of the strip is 120°,the corresponding critical shear strain is 0.86％and the critical torsion pitch is 240 mm.The torsional stress can damage the superconducting filamentary and reduce the critical current-carrying performance of the tape.
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