Bending-Strain Test Results of ITER Nb3Sn Wires and Preliminary Model Analysis
Bending-Strain Test Results of ITER Nb3Sn Wires and Preliminary Model Analysis
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发表时间：
2009-01
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通讯作者：
M. Takayasu;L. Chiesa;J. Schultz;J. Minervini
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作者：
M. Takayasu;L. Chiesa;J. Schultz;J. Minervini
为了了解大型Nb3Sn线(如ITER导线)的临界电流退化，研究了Nb3Sn线的弯曲效应。Nb3Sn线的临界电流的表征是在国家强磁场实验室使用20T，195 mm苦磁的纯弯曲线材测试装置上进行的。在很大的弯曲范围内测量了临界电流，高达导线表面名义弯曲应变的0.8%。校直后临界电流因弯曲而不可逆的退化也被评估。对5种不同的Nb3Sn丝进行了测试。其中三条是最近的ITER TF美国牛津和卢瓦塔电线和较旧的欧盟EM-LMI电线的内部锡线，而其中两条是最近的欧盟EAS和一条较旧的古川青铜电线。用一个新开发的综合模型对实验数据进行了评估，该模型考虑了中性轴移动、电流传递长度、机械断丝和由于施加弯曲而产生的单轴应变释放。
Bending effects on Nb 3 Sn wires have been investigated to understand the critical current degradation of large Nb 3 Sn superconducting cables, such as the ITER conductors. Characterizations of the critical currents of various Nb 3 Sn wires were carried out by a previously reported pure-bending strand test device using the 20 T, 195 mm Bitter magnet at the National High Magnetic Field Laboratory. The critical currents were measured over a large range of bending, up to 0.8% of the nominal bending strain at the wire surface. Irreversible degradations of the critical currents due to bending were also evaluated after straightening. Five different Nb 3 Sn wires were tested. Three of them were internal-tin wires of recent ITER TF US Oxford and Luvata wires and older EU EM-LMI wire, while two of them were a recent EU EAS and an older Furukawa bronze wire. The experimental data were evaluated with a newly developed integrated model that accounts for neutral axis shift, current transfer length, mechanical filament breakage and uniaxial strain release due to applying bending.