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Direct measurements of mechanical properties for large-grain bulk superconductors

机译：直接测量大颗粒块状超导体的机械性能

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Large single-grain bulk RE-Ba-Cu-O (RE: rare earth elements) superconductors with high J(c) values can trap magnetic fields much greater than conventional permanent magnets. At present, the maximum trapped fields are essentially limited by the mechanical property of RE-Ba-Cu-O, and therefore, its improvement is critically important. In this study, we measured mechanical properties of large-grain Y-Ba-Cu-O and Sm-Ba-Cu-O bulk superconductors by monitoring the strain with the gauges directly mounted onto the sample surface. The stress was applied to the samples by reducing the external field from 10 to 0 T at 50 K. It is found that the present strain gauge method is useful for direct characterization of mechanical properties of large grain materials. It is also confirmed that Ag addition is effective in improving the mechanical properties of large block Y-Ba-Cu-O and Sm-Ba-Cu-O. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 11]
机译：具有高J（c）值的大型单晶粒大块RE-Ba-Cu-O（RE：稀土元素）超导体可以捕获比常规永磁体大得多的磁场。目前，最大俘获场基本上受到RE-Ba-Cu-O的机械性能的限制，因此，其改善至关重要。在这项研究中，我们通过使用直接安装在样品表面的量规监测应变来测量大晶粒Y-Ba-Cu-O和Sm-Ba-Cu-O块状超导体的机械性能。通过在50 K下将外部电场从10 T减小到0 T，将应力施加到样品上。发现，本应变仪方法可用于直接表征大晶粒材料的机械性能。还证实了添加Ag可有效改善大块Y-Ba-Cu-O和Sm-Ba-Cu-O的机械性能。 （C）2000 Elsevier Science B.V.保留所有权利。 [参考：11]

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