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中文摘要：
本文通过实验分别测试了不同弯曲直径下的Bi系和YBCO两种高温超导带材的临界电流,并通过公式拟合得到了不同弯曲直径下的n指数.根据所得实验数据分别绘制了两种带材的临界电流与弯曲直径、n指数与弯曲直径、临界电流衰减率与弯曲应变关系曲线,并将弯曲应变对两种带材临界电流和n指数的影响进行了比较分析.实验结果的分析发现两种带材的最小弯曲直径不同,可能与带材的结构有关,且极端弯曲条件下YBCO带材的临界电流衰减率远低于Bi系带材的临界电流衰减率.本实验结果对超导磁体的设计以及超导带材以线圈形式出现的一些其它电工应用有一定的参考意义.
英文摘要：
In this paper, the critical currents of Bi-2223 and YI3CO under different bending diameters are measured and n values under different bending diameters are achieved through the fitting formula. According to the experimental data, the dependence of critical current on bending diameter, n value on bending diameter, and critical current attenuation rate on bending diameter have been mapped respectively. Then the effects of different bending strain on critical current and n value about two tapes are analyzed. The experimental results show that the minimum diameters of two tapes are different, which may be related to the structures of the tapes. Under the extreme bending condition, the critical current attenuation rate of YBCO is far lower than that of Bi-2223. The experimental results play a significance role on the design of superconducting magnet and some other electrical applications with superconducting coils.
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