Progress in Superconductivity

The Korean Superconductivity Society (한국초전도학회)
권호 표지

Transient Thermal Behaviors of Melt Processed Superconductors with Artificial Holes During the Cooling in Liquid Nitrogen

액체질소 냉각 시 임의의 홀을 가진 초전도체의 열응력 해석

  • Published : 2009.10.30
Download PDF
⟨ Previous Next ⟩

Abstract

Temperature distributions and thermal stresses were calculated and analyzed to investigate the effect of the artificial holes to the transient behaviors of the superconductors which was cooled in liquid nitrogen. Three dimensional finite element method was used to calculated the transient temperature and thermal stresses in the superconductors. The cooling speed of the superconductors with holes is faster than those without holes. Because the thermal stresses calculated in the superconductors can be relaxed by the distributed holes, the volume of the peak tensile stress decreases during the cooling in liquid nitrogen. If optimal metal, which can maintain the relaxation of thermal stresses, is used to fill and reinforce the artificial holes, the probability of failure of the superconductors may be decreased by the decrease of volume of peak tensile stress.

Keywords

References

  1. M. Tomita , M. Murakami , K. Katagiri, “Reliability of mechanical properties for bulk superconductors with resin impregnation” Physica C, 378-381, 783-787 (2002). https://doi.org/10.1016/S0921-4534(02)01543-5
  2. M. Tomita, M. Murakami, “Effect of resin layer on the thermal stress of bulk superconductors”, Physica C, 392-396, 493-498 (2003). https://doi.org/10.1016/S0921-4534(03)01169-9
  3. M. Tomita, M. Murakami, “High-temperature superconductor bulk magnets that can trap magnetic fields of over 17 tesla at 29 K”, Nature, 421, 517-520 (2003). https://doi.org/10.1038/nature01350
  4. M. Murakami, M. Morita, K. Doi, K. Miyamoto, “A New Process with the Promise of High Jc in Oxide Superconductor”, Jpn. J. Appl. Phys. 28, 1189-1194 (1989). https://doi.org/10.1143/JJAP.28.1189
  5. G. E. Jang, W. S. Oh, C. J. Kim, Y. H. Han, S. Y. Jung and T. H. Sung, “The effect of impregnation by resin and CNT compound on the mechanical and magnetic properties of YBCO superconductor”, Physica C, 468, 1411-1414 (2008). https://doi.org/10.1016/j.physc.2008.05.252