高温超导电缆常温及液氮温度机械拉伸性能研究

Investigation on mechanical extension property of high-temperature superconducting cable at room temperature and 77 K

摘要:

为研究高温超导电缆常温及液氮温度下的机械拉伸性能,本文分别对10 m短段高温超导电缆和10 m短段铜衬芯在常温及液氮温度(T=77 K)下的受力拉伸性能进行了实验研究。通过测试分别得到了两者在常温和T=77 K的应力应变曲线,并根据应力应变关系得到了两者在相应温度下的杨氏模量。同时,本文还针对10 m短段单芯高温超导电缆及10 m短段铜衬芯在受力情况下的降温收缩情况进行了研究,并得到了在负载为2000 kg的情况下,两者从常温将至液氮温度时的收缩变化量,为后续电缆敷设施工的裕度选择提供一定的参考依据。

关键词:高温超导电缆;机械拉伸性能;应力应变关系;杨氏模量;收缩率

Abstract:

In order to investigate the mechanical extension property of high-temperature superconducting(HTS) cable at room temperature and 77 K, we have respectively studied the mechanical extension properties of 10 m HTS cable and 10 m copper core at room temperature and 77 K. The stress-stain curves and Young modulus of the samples at corresponding temperature have been obtained by experiments. Meanwhile, we have investigated the contraction of 10 m HTS cable and 10 m copper core in a cooling process from room temperature to 77 K with tensile load of 2000 kg. The experimental results obtained in this paper could provide references to the determination of margin of cable-laying.

Key words:High-temperature superconducting cable; Mechanical extension property; Stress-strain relationship; Young modulus; Contraction rate