Superconducting Magnetic Energy Storage (SMES) devices are being developed around the world to meet the energy storage challenges. The energy density of SMES devices are found to be larger along with an advantage of using at various discharge rates. Superconducting tapes such as YBCO (Tc = 90 K) are wound around a mandrel to construct the solenoid type SMES. This SMES is cooled with Liquid Nitrogen (LN2) at 77 K. However, challenges pertaining to the development of mandrel which gives structural supports to the superconducting tapes and compatibility at cryogenic temperatures are still to be investigated. In the present work, hybrid composite material is proposed to be used as a mandrel in solenoid type SMES. In this work, different composite samples such as Double Layered Carbon, Single and Double Layered Kevlar and Hybrid Composite made of Carbon and Kevlar are treated in Liquid Nitrogen (LN) and tested for mechanical behavior. An experimental investigation is carried out to investigate the mechanical behavior of composite samples to be compatible for SMES applications. From the investigation, it is observed that the strength of composites increased when treated in LN. Further, Cryo-treated Double Layered Carbon and Kevlar are found to be desirable for SMES applications.

中文翻译：

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超导磁储能（SMES）装置的结构行为研究

世界各地正在开发超导磁储能（SMES）设备来应对储能挑战。人们发现 SMES 装置的能量密度更大，并且具有在不同放电率下使用的优势。将 YBCO (Tc = 90 K) 等超导带缠绕在心轴上以构造螺线管型 SMES。该 SMES 使用 77 K 的液氮 (LN2) 进行冷却。然而，为超导带提供结构支撑的心轴的开发以及低温下的兼容性仍有待研究。在目前的工作中，建议使用混合复合材料作为螺线管型 SMES 中的心轴。在这项工作中，不同的复合材料样品，如双层碳、单层和双层凯夫拉纤维以及由碳和凯夫拉纤维制成的混合复合材料，在液氮 (LN) 中进行处理并测试机械性能。进行了一项实验研究，以研究复合材料样品的机械行为，以适应 SMES 应用。通过研究发现，在液氮中处理后，复合材料的强度有所增加。此外，经低温处理的双层碳和 Kevlar 被发现非常适合 SMES 应用。