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Differences in applied axial strain and Ic degradation of Bi(2223)/Ag tapes

An experimental study of the axial strain on Ic degradation of multifilamentary Bi(2223)/Ag tapes by different methods has been performed. The tapes were stressed by three kinds of tensioning set-up (expanded turn, short straight sample and U-shape spring) and the transport current versus strain Ic(ε) was measured. A comparison of Ic(ε) curves showed that the applied tensioning system may influence the measured sensitivity of Bi-2223 filaments, apparently against the tension strain. The lowest strain limit for critical current degradation (εirr) was observed for the expanded turn and the highest limit for the U-shape spring system. The observed differences in Ic(ε) curves are discussed and analysed.