YBCO带材有限元细化模型电磁应力研究

将高场磁体的有限元平均模型和YBCO带材的细尺度网格模型相结合,在不同区域采用不同模型的多尺度建模方法,解决了YBCO带材多尺度网格剖分问题,具有结构简单和计算精度高的优点。从应力载荷出发,依次分析了轴对称模型在自场和背场电磁载荷下的每层应力应变的分布特点,得到了YBCO层状结构中不同材料的最弱应力应变分布位置。仿真结果为自场条件下的应力和应变最大位置处均在哈氏合金层。在背场条件下,3层带材受力最大位置在YBCO带材超导层和缓冲层,而6层细化模型最易在银层发生破坏。

Refined FEM analysis of electromagnetic stress for YBCO tape

In this paper,the finite element average model of high field magnets and the fine-scale mesh model of YBCO tapes were combined,and multi-scale modeling methods of different models were used in different regions to solve the multi-scale meshing problem of YBCO tapes. The advantages of the model are simple structure and high calculation accuracy. Based on the stress load,the distribution characteristics of stress and strain of each layer under the self-field and back-field electromagnetic loads were analyzed in turn. Finally,the weakest stress-strain distribution of different materials in the YBCO layered structure wa s analyzed. The simulation results show that the maximum stress and strain at the self-field conditions are in the Hastelloy layer. Under back-field conditions,the maximum force of the 3-layer tape was in the YBCO tape superconducting layer and the buffer layer,while the 6-layer refined model is most likely to be destroyed in the Ag layer.