Abstract
The residual strain change of Bi2212 and Ag during the cooling and heating process in theBi2212/Ag/Ag alloy composite superconductor was studied. First, the residual strain ofBi2212 filaments at room temperature was measured by the x-ray diffraction method.Then, the Young’s moduli of the constituents (Bi2212 filaments, Ag and Ag alloy) andyield strains of Ag and Ag alloy were estimated from the analysis of the measuredstress–strain curve, based on the rule of mixtures. Also, the coefficient of thermal expansionof the Bi2212 filaments was estimated from the analysis of the measured thermal expansioncurve of the composite wire. From the modeling analysis using the estimated propertyvalues and the residual strain of Bi2212 filaments, the changes of residual strain of Bi2212,Ag alloy and Ag with temperature during the cooling and heating process wererevealed.
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