NbTi/Cu多芯复合超导线集束拉拔数值模拟

Numerical Simulation of Bundling and Drawing Process of NbTi/Cu Multi-filamentary Superconducting Wires

使用有限元软件平台ABAQUS对NbTi/Cu多芯复合超导线集束拉拔过程进行数值模拟,研究了拉拔道次、铜超比大小、拉拔速度对芯丝畸变程度的影响,引入畸变因子进行量化分析,获得了集束拉拔过程中芯丝畸变规律。结果表明:超导线存在空隙时,受力变形情况是影响芯丝畸变大小的主要因素;随着铜超比增加,芯丝畸变程度减小,铜超比大于1.3后,芯丝畸变不明显;拉拔速度直接影响芯丝畸变程度,存在畸变极小值区间。

The finite element software platform ABAQUS was used to simulate the bundling and drawing process of NbTi/Cu multi-filamentary superconducting wires.The influence of pass size, copper ratio and drawing speed on the distortion of core wires was studied.The distortion factor is introduced to quantify the distortion of core wires, and the distortion pattern of core wires in the bundling and drawing process of NbTi/Cu multi-filamentary superconducting wires was obtained. The results show that the main factor affecting the distortion of core wires is the stress and deformation of core wires in the presence of superconductor voids. With the increase of copper ratio, the distortion degree of core wires decreases. When the copper ratio is greater than 1.3, the distortion is not obvious. The drawing speed directly affects the distortion of core wires, and there is a minimum range.