扭转应变与高温超导带材临界电流分布关系研究

Research about torsional strain effect on critical current of HTS tapes

为加工大电流导体和制备高温超导电缆,有必要掌握高温超导带材在扭转下性能。该文研究了扭转下高温超导一代铋锶钙铜氧(BSCCO)和二代钇钡铜氧(YBCO)带材临界电流的分布与扭转应变之间的关系,用四线法在液氮、自场环境下测量了不同扭距下带材临界电流,分析比较了三种不同带材(日本住友HT-CA;AMSC8501;Super Power SCS4050)临界电流随扭距变化规律的异同,建立了计算扭转下带材内部应变的模型,推导出了扭转下三种不同带材临界电流密度与应变之间的函数关系。此外,将实验测得的临界电流与通过模型理论计算得到的数值进行了比较和分析。

For fabrication of high current conductor and HTS cables,it is necessary to study the specifications of HTS tapes under torsional mode. The critical current distributions of BSCCO and YBCO tapes were studied in torsional ways. The relationship between critical current and twist pitch of BSCCO and YBCO tapes were measured with four-wire method in liquid nitrogen.We built the model to calculate the strain under torsional situation. With this model,we got the function between torsional strain and critical current density of three different kinds of tapes（ Sumitomo HT-CA,AMSC8501 and Super Power SCS4050）. Besides,we compared the experimental values with analytical values and demonstrated the model was correct.