| 摘要: |
| 高温超导带材在液氮温区下的力学性能对其实际应用有重要的影响。为此2016年IEC/TC90第5工作组组织了国际相关科研机构和带材供应商共9家单位对5种REBCO带材和1种BSCCO带材的液氮温区力学性能进行了循环比对实验。我单位作为国内参加该循环比对实验的唯一机构，截止至2017年初完成了上述样品共20余次有效拉伸实验的测试。根据KIT提供的《Guideline of RRT for Tensile Test on Practical REBCO and BSCCO Wires at Cryogenic Temperature》，我们确定了液氮温区下具体的拉伸试验条件，包括引伸计的选择，样品的装载、冷却方式，拉伸和卸载的速率等。我们获得了样品的应力应变曲线，并计算出弹性模量和0.2%塑性延伸强度（包括E0，Eu，Rp0.2-0，Rp0.2-u）。研究表明，除Theva公司提供的REBCO超导带样品，该测试规程下获得重复性较高的应力应变曲线，且弹性模量和0.2%塑性延伸强度均具有较小相对标准不确定度，这将为国际标准的建立提供重要的实验参考。 |
| 关键词: 高温超导带材，液氮温区力学性能测试，弹性模量，0.2%塑性延伸强度，标准不确定度 |
| DOI： |
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| 基金项目:上海市科学技术委员会（批准号：16DZ0502702）资助的课题 |
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| Tensile Test and Standardization Study on Practical REBCO and BSCCO Tapes at 77 K |
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ZHU Jiamin1 ZHAO Yue1，2 JIN Zhijian2
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| (1. Shanghai Superconductor Technology Co., Ltd，Shanghai，201203, China)
2. School of Electronic, Information and Electrical Engineering, Shanghai Jiao Tong University，Shanghai 200240, China) |
| Abstract: |
| Mechanical properties of HTS tapes have important influence on their practical applications at 77 K. IEC/ TC90 WG5 has organized an international round robin test (RRT) for mechanical properties at 77 K on five types of REBCO tapes and one BSCCO tapes. 9 international research institutions and HTS tape suppliers in total participate this RRT at 2016, where Shanghai Superconductors Co. is the only institution in China . By the beginning of 2017, we carried out more than 20 times tensile tests on these HTS tapes. According to the《Guideline of RRT for Tensile Test on Practical REBCO and BSCCO Wires at Cryogenic Temperature》provided by Karlsruhe Institute of Technology (KIT)，specific testing conditions are determined, including the selection of extensimeter, the specimen mounting , the specimen cooling mode, the rate of loading and unloading, etc. Then stress-strain curves were plotted, and the modulus of elasticity and 0.2% proof strength of each tape were calculated, such as E0，Eu，Rp0.2-0，Rp0.2-u. The studies show that following the specific testing procedure, the reproducibility of stress-strain curves is high, and the modulus of elasticity and 0.2% proof strength have a small relative standard uncertainty, which provide an important experimental reference for the establishment of international standard. |
| Key words: HTS tape,tensile test at 77K,modulus of elasticity,0.2% proof strength,relative standard uncertainty |
