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This part of IEC 61788 details the testing procedure for measuring the critical current (Ic) in practical REBCO and BSCCO composite superconductor tapes under tensile loading to determine the electromechanical properties using a stress-based tensile test method without the use of extensometers at liquid nitrogen temperature. This stress-based test method measures the reversible stress limits for Ic degradation under an applied tensile load.
When REBCO tapes are tested using this procedure, they should have a rectangular cross-section with an area of 0,06 mm2 to 5,0 mm2 (corresponding to tapes 2,0 mm to 12,5 mm in width and 0,03 mm to 0,4 mm in thickness). When BSCCO tapes are tested, they should have a rectangular cross-section with an area of 0,3 mm2 to 2,5 mm2 (corresponding to tape-shaped ones 2,0 mm to 5,0 mm in width and 0,15 mm to 0,5 mm in thickness).1 2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.IEC 60050-815:2024, International Electrotechnical Vocabulary (IEV) – Part 815: SuperconductivityIEC 61788-26, Ed. 1: Superconductivity - Part 26: Critical current measurement – DC critical current of RE-Ba-Cu-O composite superconductorsIEC 61788-28, CDV: Superconductivity – Part 28: Mechanical properties measurement – Tensile test of practical REBCO and BSCCO composite superconductors at cryogenic temperaturesISO 376:2011, Metallic materials – Calibration of force-proving instruments used for the verification of uniaxial testing machinesISO 7500-1:2018, Metallic materials – Calibration and verification of static uniaxial testing machines – Part 1: Tension/compression testing machines – Calibration and verification of the force-measuring system
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