A high-temperature superconductor (HTS) with high engineering current density and flexibility has recently been proposed and tested. The conductor is suitable for fusion magnets because of its high carrying current capacity in high field. However, the accumulated strain during the conductor fabrication and coil winding may cause irreversible degradation of the conductor critical current. Therefore, it is important to study the bending characteristics of the conductor and the accumulated winding strain and twisting strain on the HTS tapes during the conductor fabrication process. In this paper, the finite element method is used to study the bending characteristics of the conductor, and the degradation extent of the conductor critical current under different bending radii was calculated. Bending experiment was carried out, and the conductor critical currents at 77 K in self-field under different bending radii were measured. The experimental and finite element analysis results presented in this paper are useful in application of the conductor in high-field and large-scale magnet.

最近已经提出并测试了具有高工程电流密度和柔性的高温超导体（HTS）。该导体适用于熔融磁体，因为它在高磁场中具有很高的载流能力。但是，在导体制造和线圈缠绕过程中累积的应变可能会导致导体临界电流不可逆转地退化。因此，重要的是研究导体的弯曲特性以及在导体制造过程中高温超导带上的累积缠绕应变和扭曲应变。本文采用有限元方法研究导体的弯曲特性，计算了导体在不同弯曲半径下的临界电流衰减程度。进行了弯曲实验，并测量了不同弯曲半径下自电场下77 K的导体临界电流。本文提出的实验和有限元分析结果可用于导体在高磁场和大型磁体中的应用。