Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Stress analysis of high-temperature superconducting wire under electrical/magnetic/bending loads

  • Dongjin Seo (Department of Carbon Convergence Engineering and Institute of Carbon Technology, Jeonju University) ;
  • Yunjo Jung (Department of Carbon Convergence Engineering and Institute of Carbon Technology, Jeonju University) ;
  • Hong-Gun Kim (Department of Carbon Convergence Engineering and Institute of Carbon Technology, Jeonju University) ;
  • Hyung-Seop Shin (Department of Mechanical Design Engineering, Andong National University) ;
  • Young-Soon Kim (Department of Carbon Convergence Engineering and Institute of Carbon Technology, Jeonju University)
  • Received : 2023.12.08
  • Accepted : 2023.12.30
  • Published : 2023.12.31
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Abstract

The Second-generation high-temperature superconducting (HTS) Rare-Earth Barium Copper Oxide (REBCO) wire is a composite laminate having a multi-layer structure (8 or more layers). HTS wires will undergo multiple loads including the bending-tension loads during winding, high current density, and high magnetic fields. In particular, the wires are subjected to bending stress and magnetic field stress because HTS wires are wound around a circular bobbin when making a high-field magnetic. Each of the different laminated wires inevitably exhibits damage and fracture behavior of wire due to stress deformation, mismatches in thermal, physical, electrical, and magnetic properties. Therefore, when manufacturing high-field magnets and other applications, it is necessary to calculate the stress-strain experienced by high-temperature superconducting wire to present stable operating conditions in the product's use environment. In this study, the finite element model (FEM) was used to simulate the strain-stress characteristics of the HTS wire under high current density and magnetic field, and bending loads. In addition, the result of obtaining the neutral axis of the wire and the simulation result was compared with the theoretical calculation value and reviewed. As a result of the simulation using COMSOL Multiphysics, when a current of 100 A was applied to the wire, the current value showed the difference of 10-9. The stress received by the wire was 501.9 MPa, which showed a theoretically calculated value of 500 MPa and difference of 0.38% between simulation and theoretical method. In addition, the displacement resulted is 30.0012 ㎛, which is very similar to the theoretically calculated value of 30 ㎛. Later, the amount of bending stress by the circular mandrel was received for each layer and the difference with the theoretically obtained the neutral axis result was compared and reviewed. This result will be used as basic data for manufacturing high-field magnets because it can be expanded and analyzed even in the case of wire with magnetic flux pinning.

Keywords

Acknowledgement

This work was supported by the Ministry of Industry, Trade, and Energy (MITE) and by the Korea Evaluation Institute of Industrial Technology(KEIT) (No. 20020421)

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