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| A coupling model for hydrostatic pressure induced critical temperature degradation of Nb3Sn polycrystalline superconductors |
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Abstract Nb3Sn superconducting material has promising application prospect in high-field magnet. In the material application in the high-field magnet design and manufacture, strain induced superconducting performance degradation of Nb3Sn is of great importance and significance. In order to reveal the different degradation responses of Nb3Sn single crystal and Nb3Sn polycrystal under hydrostatic pressure, we establish a constitutive relation characterizing the electro-mechanical coupling behavior in Nb3Sn single crystal. The constitutive relation is based on maki de Gennes (MDG) relation. By using the relation, we predict the hydrostatic pressure induced critical temperature degradation response of Nb3Sn polycrystalline superconductor, whose deformation is modeled by polycrystalline finite element method. The predicted results are qualitatively consistent with the experimental observations. The proposed relation can consistently describe the hydrostatic pressure induced degradation responses of both Nb3Sn single crystal and Nb3Sn polycrystal. The results are helpful to improve the understanding of the electro-mechanical coupling behavior of Nb3Sn superconducting material and to lay a foundation for modeling and simulation methods for multi-field and multi-scale characterization of Nb3Sn in extreme serving environment. At the same time, the results can be used to evaluate high field superconducting magnet design and to give insight on how to fabricate superconducting materials with high strain resistance.
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Received: 02 November 2019
Published: 28 August 2020
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2020, Vol. 41 
