Second-generation high-temperature superconductors, being brittle, need to be deposited on a substrate and converted to tapes with additional reinforcement layers. These tapes are wound on a core to make superconducting wires and cables. The mechanical loads during bending, twisting, winding, etc., can degrade the superconductor. It is necessary to determine the strain-induced during these processes. Variations in induced strain with bending of superconductors have been investigated analytically and numerically for various configurations of Rare-Earth Barium Copper Oxide (REBCO) tape. The numerical simulation has been carried out using COMSOL Multiphysics software; the analytical examination of the effect has been performed applying the Flexure formula. The geometrical configuration of the superconducting tape is varied in terms of the bending radius, the thickness of constituting layers made of Hastelloy and copper. The results showed that the variation in the thickness of the substrate has a large influence on the induced strain. Electrical performance analysis is also carried out using the power law of strain dependence and the 5% critical current degradation point is noted. Results of these numerical and analytical investigations are expected to help in finding out critical parameters to avoid degradation while being in use.

中文翻译：

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REBCO 基超导带弯曲退化的分析和数值研究


第二代高温超导体是脆性的，需要沉积在基材上并转化为具有额外增强层的带材。这些带材缠绕在芯上以制造超导线材和电缆。弯曲、扭转、缠绕等过程中的机械载荷会使超导体退化。有必要确定这些过程中引起的应变。针对不同配置的稀土钡铜氧化物 (REBCO) 带，对超导体弯曲引起的应变变化进行了分析和数值研究。采用COMSOL Multiphysics软件进行数值模拟；应用弯曲公式对效果进行了分析检查。超导带的几何构造在弯曲半径、哈氏合金和铜构成层的厚度方面有所不同。结果表明，基体厚度的变化对诱发应变有很大影响。还使用应变依赖性幂律进行电气性能分析，并记录了 5% 临界电流退化点。这些数值和分析研究的结果预计将有助于找出关键参数，以避免在使用时发生降解。