Rare-earth based barium copper oxide (REBCO) superconducting coated conductors are promising candidates for the design of high field magnets. In a high magnetic field, these conductors have to withstand huge Lorentz force, which would threaten the safety of superconducting devices. Recently, researchers have found that the electromagnetic-mechanical coupling has a significant impact on the overall response of the magnet system. It has been demonstrated that mechanical deformation can lead to the movement of magnetic flux in superconductors and changes in the critical current of superconductors. To take into account the electromagnetic-mechanical coupling effects, REBCO coated conductors are modeled as deformable conductors based on continuum mechanics of electromagnetic solids. Then, a fully coupled electromagnetic-mechanical model is developed in this paper, which is verified with the experimental results. Furthermore, during the electromagnetic-mechanical coupling simulation, contact separation occurs in REBCO pancake coils. To characterize the global mechanical performance of the REBCO pancake coils (containing hundreds of contact conditions), the concept of flexural rigidity in elastic shell theory is employed. Then, a mechanical homogeneous model is proposed to simplify the model containing hundreds of contact pairs and enable the effective simulation of large-scale HTS systems. This framework can provide theoretical support to the mechanical research of high field magnets.

中文翻译：

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超导线圈的电磁-机械耦合模型和接触行为


稀土基氧化钡铜 (REBCO) 超导涂层导体是高场磁体设计的有希望的候选者。在强磁场中，这些导体必须承受巨大的洛伦兹力，这将威胁超导器件的安全。最近，研究人员发现电磁-机械耦合对磁体系统的整体响应有显着影响。已经证明，机械变形可以导致超导体中磁通量的运动和超导体临界电流的变化。为了考虑电磁-机械耦合效应，基于电磁固体的连续介质力学，将 REBCO 涂层导体建模为可变形导体。然后，本文建立了全耦合电磁-机械模型，并通过实验结果进行了验证。此外，在电磁-机械耦合仿真过程中，REBCO 扁平线圈出现接触分离。为了表征 REBCO 扁平线圈（包含数百种接触条件）的整体机械性能，采用了弹性壳理论中的弯曲刚度概念。然后，提出了一种机械齐次模型来简化包含数百个接触对的模型，并能够有效模拟大型高温超导系统。该框架可为高场磁体的力学研究提供理论支持。