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为应对12 T以上的磁场影响,国际热核聚变反应堆ITER和国内CFETR装置上环向和中心螺线磁体系统已采用Nb3Sn材料;而低温下临界温度和分流温度是超导体稳定运行的重要因素,由于缺乏应变效应对临界温度和分流温度影响的研究,为此,本研究利用模拟应变作用的周期载荷,对Nb3Sn超导股线样品的临界温度和分流温度进行了测试以及数值模拟计算,分析获得扭距等作用使临界温度和分流温度随模拟应变载荷周期退化的结果。同时,推导分流温度随周期载荷变化的双对数分布模型,模型可以描述股线样品中由周期载荷导致的弯曲应变所产生的股线性能降级情况。
In order to deal with the magnetic field above 12 T, Nb3Sn materials have been used in the toroidal and center helical magnet systems of ITER and domestic CFETR devices. However, the critical temperature and shunt temperature at low temperature are important factors for the stable operation of superconductors. Lack of study on the effect of strain effect on critical temperature and shunt temperature. Therefore, in this study, the critical temperature and shunt temperature of Nb3Sn superconducting strands were tested and numerically simulated by using the cyclic load simulated strain. Distance and other effects so that the critical temperature and shunt temperature with simulated strain load cycle degradation results. At the same time, a double logarithmic distribution model of shunt temperature with cyclic loading is derived. The model can describe the degradation of strand performance caused by bending strain caused by cyclic loading in the strand samples.