Strain Analysis of $I_{c}(\varepsilon)$ Characteristic of YBCO Coated Conductor Measured by a Walters Spring
Strain Analysis of $I_{c}(\varepsilon)$ Characteristic of YBCO Coated Conductor Measured by a Walters Spring
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用沃尔特斯弹簧测量 YBCO 涂层导体的 $I_{c}(varepsilon)$ 特性的应变分析
DOI：
10.1109/tasc.2008.922298
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发表时间：
2008
影响因子：
1.8
通讯作者：
V. Selvamanickam
中科院分区：
文献类型：
--
作者：
M. Sugano;S. Choi;A. Miyazoe;K. Miyamatsu;T. Ando;K. Itoh;T. Kiyoshi;H. Wada;V. Selvamanickam
采用沃尔特斯弹簧（WASP）测量了YBCO涂层导体的ic应变特性。在这种技术中，额外的弯曲和热应变引起的YBCO层应考虑。为了对YBCO层产生不同的初始弯曲应变，将导体沿不同的弯曲方向缠绕不同直径的弹簧。结果表明，WASP的-应变曲线强烈依赖于初始弯曲应变状态。然而，当对-应变曲线进行最大值归一化时，即使包括单轴应变法测量的短样本数据，所有曲线也落在同一曲线上。根据混合探针的应变分析规律，各应变曲线沿应变轴的位移可以用焊接过程中的弯曲应变和热应变来解释。这一结果表明，在目前的YBCO涂层导体中，弯曲应变和拉伸应变的组合应变可以看作是简单的总和。
Ic-strain characteristic of YBCO coated conductor was measured using a Walters spring (WASP). In this technique, additional bending and thermal strains induced to the YBCO layer should be considered. In order to produce different initial bending strain to the YBCO layer, the conductor was wound around the springs with different diameters and in the different bending directions. The clear evidence was obtained that -strain curves using a WASP strongly depend on the initial bending strain state. However, when -strain curves were normalized by a maximum value, all of the curves even including the data measured by uniaxial strain method for a short sample fall on to the same curve. Strain analysis based on the rule of mixture probes that the shift along the strain axis for each -strain curve can be explained by the bending and thermal strain during soldering. This result suggests that combined strain of bending and tensile strains can be regarded as simple summation in the present YBCO coated conductor.