CRITICAL CURRENT DEPENDENCE ON AXIAL STRAIN AT LN2 TEMPERATURE OF AG-CLAD BI(2223) TAPES

Abstract

The critical currents (1 μvolt/cm criterion) or commercially supplied tapes of Bi2Sr2Ca2Cu3OX (Bi(2223)) in Ag were measured at LN2 temperature as axial stresses of up to 220 MPa were applied. The critical current decreased linearly with increasing strain up to the point or plastic deformation, whereupon it dropped discontinuously to less than 10% or the unstressed value. The resistivity of a pure silver sample was also tested at LN2 temperature it was constant with increasing stress up to (the same) point of plastic deformation; then it increased linearly. Youngs modulus and the yield strength at LN2 and room temperature are compared.