The effect of a constraining metal tube on flux pinning induced stress in a long cylindrical superconductor
The effect of a constraining metal tube on flux pinning induced stress in a long cylindrical superconductor
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DOI：
10.1063/1.4737794
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发表时间：
2012-07
影响因子：
3.2
通讯作者：
Xiaobin Yang;S. Tu
中科院分区：
文献类型：
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作者：
Xiaobin Yang;S. Tu
在磁化过程中使用合金管对超导圆柱体施加压力可以降低高温超导体中钉扎引起的拉伸应力。本文对超导圆柱体与金属管之间的自然接触状态进行了建模。得到了超导体具有磁性的各向同性磁弹性问题的精确解，并得到了金属管对超导体施加的接触压力的表达式。该表达式明确地给出了超导体的杨氏模量与金属的杨氏模量之比以及金属管的内外半径之比的贡献。本文用Bean临界态模型分析了在金属管约束下，场冷激活和脉冲场激活两种情况下超导体中的应力分布。结果表明，金属管可以防止超导体的径向膨胀，降低超导体的热膨胀系数。
The use of an alloy tube to impose pressure on a superconducting cylinder during magnetizing reduces pinning-induced tensile stress in high temperature superconductors has been well established. In this paper the natural contact state between the superconducting cylinder and the metal tube is modeled. An exact solution is obtained for the isotropic magnetoelastic problem with the superconductor behaving magnetically, and an expression for the contact pressure exerted on the superconductor by the metal tube is obtained. This expression explicitly gives the contribution of the ratio of Young’s modulus of the superconductor to that of the metal and the ratio of the internal to external radii of the metal tube. The stress profile in the superconductor, subjected to the restriction of metal tube, with both field cooled activation and pulse field activation is analyzed in terms of the Bean critical-state model. The results show that the metal tube can prevent radial expansion of the superconductor and can reduc...