Thermal strain analysis model of Nb3Sn superconducting strands

被引：0

作者：

Jiang, Huawei ^{[1
]}

Wu, Songtao ^{[2
]}

机构：

[1] School of Information Science and Engineering, Henan University of Technology, Zhengzhou 450001, China

[2] Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China

来源：

Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | 2014年 / 43卷 / 06期

关键词：

Binary alloys - Numerical methods - Experimental reactors - Thermal expansion - Superconducting cables - Temperature distribution;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The Nb3Sn superconducting strands used for ITER (international thermal-nuclear experimental reactor) consist of brittle intermetallic compounds. Due to the different coefficients of thermal expansion and different moduli of elasticity among the components, thermal strain is generated in the composite from heat treatment temperature down to room temperature, even to operating temperature (4.2 or 4.5 K). In order to research thermal strain and build the mathematic model of the Nb3Sn strands, local strain measurements during heating by means of quantum beams and tensile tests at room temperature were carried out. According to the elasto-plastic behavior of Nb3Sn revealed in the stress curves, the thermal strain was evaluated. The results show that the local strain exerted on superconducting (SC) filaments along the axial direction is compressive at room temperature and tensile at high temperatures. Moreover, the temperature dependence of thermal strain can be reproduced well by the numerical calculation method proposed in the paper.

引用

页码：1372 / 1376