Analysis of Thermally Induced Strains for Composite Superconductors

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  • 複合超電導線材の残留熱歪解析
  • フクゴウ チョウデンドウセンザイ ノ ザンリュウ ネツ ワイ カイセキ

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Abstract

Nb3Sn compound superconducting wires and Ag sheathed Bi system high Tc wires used for high-field magnet applications are composite superconductors which consist of a superconductor, a stabilizer, a matrix, and a reinforcement. The composite superconductor is subjected to temperature difference in around 1000 K between high temperature where the superconducting layer is formed and cryogenic temperature where the conductor is operated. As each component material which construct the composite superconductor has different thermal expansion coefficient, it is subjected to thermally-induced residual strain. To clarify those strains behavior, we analyzed elastically 3-D strains in the composite superconductors, radial and tangential directions in the cross-sectional plane added to longitudinal direction using a multiple cylindrical model.<BR>Strains in radial and tangential directions varied with combination of component materials having large and small thermal expansion coefficients. If the superconducting layer was placed on the middle or outer cylindrical layer, the strains in the radial tangential directions were to be affected by magnitude of the thermal expansion coefficient of the neighboring component.

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