Superconductor Science and Technology · 2008 · 14 citations · 16 references
Natural SciencesMaterials EngineeringMaterials ScienceMaterials CharacterizationMechanical Behavior Of MaterialsMetallic MaterialsAlloysComposite MaterialsResidual StressSuperconducting MaterialsThermal Expansion AnalysisThermal Properties Of MaterialsResidual StrainResidual Strain MeasurementStress-strain CurveStress-strain Curve AnalysisSuperconducting CompositesSuperconducting WiresThermal ExpansionX-ray Diffraction Analysis
The residual strain change of Bi2212 and Ag during the cooling and heating process in the Bi2212/Ag/Ag alloy composite superconductor was studied. First, the residual strain of Bi2212 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) and yield strains of Ag and Ag alloy were estimated from the analysis of the measured stress–strain curve, based on the rule of mixtures. Also, the coefficient of thermal expansion of the Bi2212 filaments was estimated from the analysis of the measured thermal expansion curve of the composite wire. From the modeling analysis using the estimated property values 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 were revealed.
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