文档介绍：华中科技大学
硕士学位论文
高温超导带材机械特性实验研究
姓名:杨捷
申请学位级别:硕士
专业:电机与电器
指导教师:李亮
2011-01-07
华中科技大学硕士学位论文
摘要
随着超导技术的发展,超导材料已经应用到了许多领域,机械特性是影响高温
超导带材应用的一个重要特性。高温超导带材在使用过程中,可能会受到拉、压、
弯曲、疲劳等载荷的作用,从而产生相应的应变,若应变超过一定的范围就会导致
超导材料产生裂纹甚至断裂,使带材的临界电流发生衰减,影响到超导带材的应用。
因此研究超导材料临界电流与应变的关系有重要的实际意义。
本文设计了高温超导带材的机械特性实验平台,实验平台采用的是四点弯曲的
方法进行载荷加载,四引线的方法测量超导带材的临界电流,并对实验平台载荷加
载精度和临界电流的测量误差进行了分析,表明该实验平台可以有效的进行超导带
材的机械特性实验。与一般两点拉伸加载的实验平台相比,本实验平台更容易实现
压应变与疲劳加载;与采用其它各种弯曲加载的实验平台相比,本实验平台具有操
作方便、试样所受应变均匀的优势。
利用本实验平台测量了两种铋系高温超导带材在拉、压、弯曲和疲劳等载荷形
式作用下的临界电流,并对应变对临界电流的影响进行了分析,实验表明:铋系高
温超导带材存在一个临界应变,其抗压性能优于抗拉性能;疲劳载荷能使铋系高温
超导带材的临界电流进一步衰减;铋系高温超导带材存在最小弯曲半径。

关键词:高温超导带材机械性能临界电流四点弯曲应变疲劳
I
华中科技大学硕士学位论文
Abstract
With the development of superconducting technology, superconducting materials
have been applied in many areas. The mechanical property of HTS tapes is an important
feature in specific applications. High-temperature superconducting tapes may be subject to
tension, compression, bending and fatigue load effects, which will result in a
corresponding strain. If the strain exceeds a certain range, the superconducting materials
will crack or even break and the band material critical current decay will be occurred,
which affect the application of superconducting tapes. Therefore, the critical current of
superconducting material relationship with the strain has important practical significance.
The experimental platform for measuring the mechanical propertied of
high-temperature superconducting tapes is designed .The method of four-point bending is
used to load and the four-lead method is to measure the critical current of superconducting
tapes. Meanwhile, the loading precision for the experimental platform and the critical
current measurement errors are analyzed, which indicate that the experimental platform
can effectively carry out the mechanical properties of superconducting tapes experiment.
Compared with the general tensile loading with the two point