偏量应变定标模型在Nb_3Sn股线中的应用

采用Pacman弹簧装置测量在不同磁场,温度和应变条件下Nb3Sn多芯股线的V-I特征曲线。外部磁场变化范围由4T到14T,温度变化由4.2K至10K,材料轴向应变变化范围在-0.9%～+0.6%。在此基础上详细介绍了近年来应用广泛的三维偏量应变定标模型,通过该定标模型模拟了Nb3Sn超导材料临界电流Ic随应变状态的变化规律。

Application of Deviatoric Strain Model on Nb_3Sn Multifilament Strands

Nb3Sn as an A15 phase, is strain sensitive. The superconducting critical current of Nb3Sn strands is affected by the magnetic field, temperature and strain state of strands. Nb3Sn strands fabricated by internal tin process for ITER were measured in the axial strain range from-0.9% (compressive) to +0.6% (tensile), temperature range from 4.2 K to 10 K and magnetic field from 4 T and 14 T on the Pachman spring device. The scaling of partial measured results changed with Ic were extrapolated by the deviatoric ...