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| 应变片的强化效应与热效应对YBCO 带材的影响探究 |
| The Investigation of Influence on YBCO CC Caused by the Strengthening Effect and Heat Effect of Strain Gage |
| 投稿时间：2024-06-27 修订日期：2024-08-11 |
| DOI： |
| 中文关键词: YBCO带材，应变片，虚拟引伸计，强化效应，热效应 |
| 英文关键词:YBCO tape, strain gage, virtual extensometer, strengthening effect, heat effect |
| 基金项目:国家自然科学(12325205, 12232005, U2241267)；甘肃省重大科技专项 (23ZDKA0009) |
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| 中文摘要: |
| 应变片由于灵敏度高、操作简单等优点,被广泛应用于以YBCO为代表的二代高温带材(简称：YBCO带材)的力电特性的研究及超导设备的失超检测系统中。为了获取准确的应变测试结果,应变片需与YBCO带材粘贴牢固,且测量过程需对应变片通电,因此对于YBCO带材在低温下的测试和运行,其强化效应和热效应无法避免。本文首先基于虚拟引伸计对YBCO带材单轴拉伸过程中的应变片强化效应进行了实验定量研究,通过对两种方法下得到的杨氏模量进行分析,发现基于应变片测试数据得到的杨氏模量明显偏大,且相对于虚拟引伸计测得的结果偏差达10%以上；此外,在77 K 及更低温度时,通过温度传感器发现应变片粘贴位置样品的温度升高,镀铜带材的温升较小,为1.9 K,而镀银带(无铜稳定层)的温升超过20 K,同时发现带材温度越低,其温度变化速率越大。在YBCO带材的实验测量及应用中,应变片的强化效应和热效应不仅会对实验测试结果有显著影响,同时其热效应也使得其成为工业应用中潜在的热失控源。以上研究为在工程应用中应变片测量YBCO带材变形时出现的强化效应和热效应提供了研究基础。 |
| 英文摘要: |
| Strain gage is widely used in investigating the electromechanical properties of YBCO superconducting tapes and quench detection system of superconducting devices because of its high sensitivity and simple operation. The electric current and strong adhesive are essential for the strain measurement. As a result, the strengthening effect and heat effect induced by strain gage cannot be inevasible in the strain measurement in the test and operation of YBCO. In this paper, the quantitative experiment of strengthening effect in the process of the uniaxial tension of YBCO tapes is studied firstly based on the virtual extensometer and strain gage. Through the analysis of elastic modulus obtained from the two methods, it is found that the modulus based on the data of strain gage is smaller, whose deviation is more than 10% compared with the value based on the virtual extensometer. In addition, it is obvious by the temperature sensor that the temperature of YBCO tape rises at the position of strain gage pasted at 77 K or lower temperature. Results show that the temperature variation of YBCO tape with Cu layer is about 1.9 K, and the variation of YBCO without Cu layer is more than 20 K. In the meantime, it can be found that the temperature changing rate is faster, when the temperature is lower. Not only the strengthening effect and heat effect caused by strain gage will take noteworthy influence of the experiment of YBCO tapes, but also its heat effect will make the strain gage be a potential uncontrollable heat source in the industrial application. The study above provides the research basis to strengthening effect and heat effect caused by strain gages in the engineering application of YBCO tapes. |
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