Reversible Strain Response of Critical Current in Differently Processed GdBCO Coated Conductor Tapes Under Magnetic Fields

In this study, the reversible response of I c with uniaxial strain in differently processed GdBCO coated conductor tapes with different substrates has been investigated under self field and magnetic field conditions at 77 K. Higher irreversible strain limit, ε irr was observed in those samples with stainless steel substrate. Additional brass lamination to the Cu-stabilized samples produced enhancement of both ε irr and endurable load limit. However, no significant widening of the I c / I c0 -tensile strain window with brass addition was observed in the case of samples having stainless steel substrate. Furthermore, under magnetic field, the I c degradation behavior was independent on the kind of substrate material, but varied with the kind of manufacturing process adopted. The GdBCO samples showed different I c peak positions and degradation behavior depending on the level of magnetic field applied.