Estimation of Critical Current of Bent Bi2223 Composite Tape by Application of Superconducting Core Shape-Incorporated Model

The bending strain-dependence of critical current of Bi2223/Ag/Ag-Mg alloy superconducting composite tape was studied experimentally and analytically. The measured change of critical current with bending strain was described well by the superconducting core shape-incorporated model. The distribution of damage-inducing parameter (difference between the tensile fracture strain and thermally induced residual one) in the samples was described well by the Weibull distribution. By application of this result, the distributions of irreversible bending strain and critical current at various bending strain were discussed.