AbstractSeveral experiments of coil packs simulating superconducting coils in the large helical device (LHD) were carried out to evaluate rigidity of coils at cryogenic temperature. In these experimental results, nonlinear behavior was apparent in relations of load versus displacement. In the supplemental measurements, there was a gap between the superconductor and electrical insulators. Nonlinearity as a contact problem was considered and some analytical models using the finite element method were devised. The gap was modeled using the general contact element in a finite element model. Assuming the number of conductors contacting the insulator was increased gradually, the analytical results showed good correlation with the experimental findings.
大型螺旋装置（LHD）中模拟超导线圈的线圈组在低温下进行了刚性评估实验。实验结果表明，在载荷与位移的关系中明显呈现出非线性行为。在补充测量中，超导体与电绝缘体之间存在间隙。将非线性视为接触问题，并利用有限元法构建了若干解析模型。在有限元模型中，采用通用接触单元对间隙进行建模。假设与绝缘体接触的导体数量逐渐增加，解析结果与实验 findings 显示出良好的一致性。