Chapter 1.6: Mechanical Properties of Bi-2223 Wires

The characteristics of tensile properties of commercial Bi-2223 wires were explained by using the rule of mixture below the reversible strain limits. The reversible tensile strain limit coincides well with the start of degradation in critical current, because both phenomena have the same origin, at which the SC filaments start to fracture macroscopically. In order to improve both properties, it is crucial to maximize the reversible strain region. Its strategy was discussed in terms of thermal strain and pre-strain dependence through the strengthening by lamination.