Magneto-Mechanical Coupling Analysis of a Superconducting Solenoid Using FEM With Different Approaches
Magneto-Mechanical Coupling Analysis of a Superconducting Solenoid Using FEM With Different Approaches
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DOI：
10.1109/tasc.2020.2969402
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发表时间：
2020-01
影响因子：
1.8
通讯作者：
Q. Hu;Xingzhe Wang;M. Guan;Youhe Zhou
中科院分区：
文献类型：
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作者：
Q. Hu;Xingzhe Wang;M. Guan;Youhe Zhou
高电流密度的强场超导磁体经常受到较大的洛伦兹力的作用，导致超导线圈不可避免地发生变形。这种变形将进一步干扰磁场质量和磁体的运行安全稳定。准确估计超导线圈励磁过程中的磁力行为是一个至关重要的问题。采用耦合有限元分析方法，分析了10T超导螺线管的磁力特性和行为。提出了三种不同的建模方法，即基于复合材料混合规则的各向同性均化建模、基于代表性体积元(RVE)的正交各向异性均化建模和多层次细节的分层建模。模拟结果表明，与各向同性和正交各向异性均匀模型相比，分层模型对超导线圈磁力行为的有限元预测与实验数据吻合较好。用正交各向异性均匀模型对超导螺线管的力学特性进行了较好的预测。通过分层建模，得到了更精细的超导线材、线材绝缘和填充材料的应变/应力分布，这对于评估超导线圈与基体以及夹杂物之间的界面的力学性能是至关重要的。
The high-field superconducting magnet carrying with high current density are commonly exposed to large Lorentz forces leading to the unavoidable deformation in superconducting coils. The deformation will further disturb the magnetic field quality and the operating safety and stability of the magnet. An accurate estimation of the magneto-mechanical behaviors during excitation of superconducting coils is a crucial one. In this paper, the magneto-mechanical characteristics and behaviors of a 10 T superconducting solenoid were analyzed using the coupled finite element modeling (FEM). Three different approaches were developed, which include the isotropic homogenized modeling based on the mixture rule of composites, the orthotropic homogenized modeling based on the representative volume element (RVE) method, and the hierarchical modeling with multilevel details. The simulations show that the FEM predictions on magneto-mechanical behaviors of the superconducting coils using the hierarchical model are in better agreement with the experimental data compared to the isotropic and orthotropic homogenized models. The orthotropic homogenized modeling gave good predictions on the mechanical characteristics of superconducting solenoid. More fine strain/stress profiles of the superconducting wire, wire insulation and filling material have been obtained by the hierarchical modeling, which are vital for evaluation of mechanical properties of the interface among superconducting coils and the matrix, as well the inclusions.