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Mechanical response induced by flux jump in a cylindrical superconductor

机译:通过磁通跳跃在圆柱形超导体中引起的机械响应

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摘要

The flux jump in bulk superconductors is accompanied by a rapid change in temperature and magnetic field, which can induce change in electromagnetic bodyforce and thermal stress. It is well known that bulk superconductors are brittle and have low mechanical strength, and thus, large electromagnetic bodyforce and thermal stress can cause damage of the bulk superconductor. In this paper, an electromagnetic-thermal-mechanical multi-physics model is adopted to compute the mechanical response of a bulk superconductor during flux jump in an external magnetic field. The results indicate that the flux jump in the bulk superconductors can also lead to the jump of the average electromagnetic force, temperature, stress, and strain. Meanwhile, it can be found that the flux jump can occur more easily with a faster change in the magnetic field, a lower ambient temperature, and a large-size superconductor. The results also show that the peak value of thermal strain is much larger than the strain generated by electromagnetic bodyforce during the flux jump. In addition, the change in strain has the same trend as that of the temperature. Thus, the strain may also be used to monitor the flux jump.
机译:散装超导体中的磁通跳跃伴随着温度和磁场的快速变化,可以诱导电磁体积和热应力的变化。众所周知,散装超导体是脆性并且机械强度低,因此,大的电磁体积和热应力会导致散装超导体的损坏。本文采用电磁 - 热机械多物理模型来计算外部磁场中磁通跳跃期间散装超导体的机械响应。结果表明,散装超导体中的焊剂跳跃也可以导致平均电磁力,温度,应力和菌株的跳跃。同时,可以发现磁通跳跃可以更容易发生磁场,较低的环境温度和大尺寸超导体的更快。结果还表明,在磁通跳跃期间,热应变的峰值远远大得多大于通过电磁体制率产生的应变。此外,应变的变化具有与温度相同的趋势。因此,该应变也可用于监测磁通跳跃。

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