Electromechanical Behavior of Bronze $\hbox{Nb}_{3} \hbox{Sn}$ Strands Under Wide Range Pure-Bending
Electromechanical Behavior of Bronze $\hbox{Nb}_{3} \hbox{Sn}$ Strands Under Wide Range Pure-Bending
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DOI：
10.1109/tasc.2013.2239353
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发表时间：
2013-06
影响因子：
1.8
通讯作者：
L. Chiesa;N. Allen;J. King;P. Mallon;M. Takayasu
中科院分区：
文献类型：
--
作者：
L. Chiesa;N. Allen;J. King;P. Mallon;M. Takayasu
进行了一系列实验来研究Nb3Sn超导线材在大纯弯曲应变下的机电性能。基于先前开发的施加应变高达 0.8% 的纯弯曲样品支架梁，改进的梁设计用于覆盖绞线表面上高达 1.25% 标称弯曲应变的整个范围。针对 EAS 和 Hitachi 的青铜绞线，讨论了作为弯曲应变函数的临界电流测量。样品主要在15 T下进行测试。通过有限元模型结构分析研究高变形和洛伦兹载荷效应。有限元模型与实验结果之间具有良好的一致性。进行了全范围弯曲应变和反向电流测试，发现对于低于 3 kN/m 的洛伦兹载荷，样品支架设计可以适当地覆盖 0.81 毫米直径绞线表面上 0.6% 至 1.25% 标称应变的弯曲范围。
A series of experiments to study the electromechanical performance of Nb3Sn superconducting wires under large pure bending strain has been performed. Based on the previously developed pure-bending sample holder beam for applied strains up to 0.8 %, an improved beam was designed to cover the entire range up to nominal bending strains of 1.25% on the strand surface. Critical current measurements as a function of bending strain are discussed for bronze strands from EAS and Hitachi. The samples were mainly tested at 15 T. High deformation and Lorentz load effects were studied through a finite element model structural analysis. Good agreement between finite element model and experimental results was found. Full range bending strain and reversed current tests were performed and it was found that for Lorentz loads below 3 kN/m the sample holder design could be appropriately used to cover a bending range from 0.6 % to 1.25% nominal strain on the surface of a 0.81-mm-diameter strand.