Effects of repeated bending load at room temperature for composite Nb3Sn wires

被引:15
作者
Awaji, S
Watanabe, K
Katagiri, K
机构
[1] Tohoku Univ, Inst Mat Res, High Field Lab Superconducting Mat, Aoba Ku, Sendai, Miyagi 9808577, Japan
[2] Iwate Univ, Fac Engn, Morioka, Iwate 0208511, Japan
关键词
D O I
10.1088/0953-2048/16/9/316
中图分类号
O59 [应用物理学];
学科分类号
摘要
In order to realize a react and wind (R&W) method for Nb3Sn wires, the influences of a bending load at room temperature are investigated. Usually, the superconducting wires undergo bending loads at room temperature repeatedly during winding and insulation processes. We define these bending loads as 'pre-bending' treatments. We applied the pre-bending strain of 0 and 0.5% to the highly strengthened CuNb/(Nb, Ti)(3)Sn wires, and measured the stress/strain properties and critical currents. The improvements of stress dependence of normalized critical current and the increase of the maximum critical current by the pre-bending treatments were found. The model based on the distribution of the local tensile strain as a bending strain describes the experimental results well without the increase of the maximum critical current. When the pre-bending strain was applied, the calculated results indicate that the mechanical properties are improved due to the local work hardening, and hence the stress dependence of I-c increases.
引用
收藏
页码:1059 / 1063
页数:5
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