液氮温区下高温超导带材力学性能测试技术及标准化研究

发布时间：2018-04-13 09:45

本文选题：高温超导带材 + 液氮温区力学性能测试　；参考：《低温物理学报》2017年05期

【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.
[Abstract]:The mechanical properties of HTS tapes in liquid nitrogen temperature range have an important effect on their practical application.For this reason, in 2016, IEC/TC90 working Group 5 organized nine international research institutes and strip suppliers to carry out a cycle comparison experiment on the mechanical properties of five REBCO strips and one BSCCO strip in the liquid nitrogen temperature region.As the only organization in China to participate in the cycle comparison experiment, our unit has completed more than 20 effective tensile tests of the above samples by the beginning of 2017.According to < Guideline of RRT for Tensile Test on Practical REBCO and BSCCO Wires at Cryogenic Temperature >, we have determined the specific tensile test conditions at liquid nitrogen temperature, including the selection of extensometer, loading of samples, cooling mode, drawing and unloading rate, etc.The stress-strain curves of the samples are obtained, and the elastic modulus and the plastic elongation strength of 0.2% are calculated.The results show that, except for the REBCO superconducting tape sample provided by Theva, the stress-strain curves with high repeatability are obtained under this test procedure, and the elastic modulus and the plastic extension strength of 0.2% are of relatively low standard uncertainty.This will provide an important experimental reference for the establishment of international standards.
【作者单位】：上海超导科技股份有限公司;上海交通大学电子信息与电力工程学院;
【基金】：上海市科学技术委员会(批准号:16DZ0502702) 国家重点研发计划(2017YFB0902301)资助的课题
【分类号】：TM26

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