YBCO高场内插线圈的应力分析研究

FEM analysis of stress for YBCO high field insert coils

YBCO内插线圈绕制过程中施加的绕制预紧力、降温过程中的热应力以及通电运行时产生的电磁力,是内插线圈应力的主要机械载荷。内插线圈中YBCO导体中的应力是影响线圈超导性能的主要因素之一。文中采用有限元方法,针对一个25T的YBCO内插线圈,通过建立3D仿真模型,从绕制预紧力、冷收缩和洛伦兹力等应力载荷出发,依次分析了YBCO涂层导体在三种载荷下的应力分布特点。进一步采用细化线圈模型,得到了YBCO带材层状结构中不同材料的应力分布特点。研究结果可为高场内插线圈的工艺设计提供依据。

Pretension, thermal contraction and electromagnetic forces are main sources of stress in YBCO high field insert magnets. These stresses are very important factors affecting the final performance of YBCO insert magnets. In this paper, Finite Element Method （FEM） was used to analyze the stress evolution process from coil manufacture to magnet energization for a 25T full superconducting magnets. The stress distributions in the YBCO insert coils were respectively simulated based on refined layer model of YBCO coated conductors under the three above mechanical loads. The results can be used in the structure design of high field YBCO insert magnet.