Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Evaluation of electromechanical properties in REBCO CC tapes under transverse compression using anvil test method

  • Diaz, Mark Angelo (Department of Mechanical Design Engineering, Andong National University) ;
  • Shin, Hyung-Seop (Department of Mechanical Design Engineering, Andong National University)
  • Received : 2022.09.15
  • Accepted : 2022.09.23
  • Published : 2022.09.30
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Abstract

One of the major applications of REBCO coated conductor (CC) tapes is in superconducting magnets or coils that are designed for high magnet fields. For such applications, the CC tapes were exposed to a high level of stresses which includes uniaxial tensile or transverse compressive stresses resulting from a large magnetic field. Thus, CC tapes should endure such mechanical load or deformation that can influence their electromechanical performance during manufacturing, cool-down, and operation. It has been reported that the main cause of critical current (Ic) degradation in CC tapes utilized in coil windings for superconducting magnets was the delamination due to transversely applied stresses. In most high-magnetic-field applications, the operating limits of the CC tapes will likely be imposed by the electromechanical properties together with its Ic dependence on temperature and magnetic field. In this study, we examined the influence of the transverse compressive stress on the Ic degradation behaviors in various commercially available CC tapes which is important for magnet design Four differently processed REBCO CC tapes were adopted to examine their Ic degradation behaviors under transverse compression using an anvil test method and a newly developed instantaneous Ic measurement system. As a result, all REBCO CC tapes adopted showed robustness against transverse compressive stresses for REBCO coils, notably at transverse compressive stresses until 250 MPa. When the applied stress further increased, different Ic degradation behaviors were observed depending on the sample. Among them, the one that was fabricated by the IBAD/MOCVD process showed the highest compressive stress tolerance.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (No. 2022M3I9A1076881). This research was also partially supported by the Korea Evaluation Institute of Industrial Technology (KEIT) grant funded by the Korean Government (MOTIE) (Grant No. 20020421).

References

  1. S. Hahn, et al., "45.5-tesla direct-current magnetic field generated with a high-temperature superconducting magnet," Nature, vol. 570, pp. 496-499, 2019. https://doi.org/10.1038/s41586-019-1293-1
  2. H. S. Shin, et al., "Evaluation of the delamination strengths in differently processed practical Ag-stabilized REBCO CC tapes under transverse loading," Prog. Supercond. Cryog., vol. 21, no. 4, pp. 34-38, 2019.
  3. D. C. van der Laan, et al., "Delamination strength of YBCO coated conductors under transverse tensile stress," Supercond. Sci. Technol., vol. 20, pp. 765-770, 2007. https://doi.org/10.1088/0953-2048/20/8/007
  4. M. A. Diaz and H. S. Shin, "Variations of the strain effect on critical current in REBCO coated conductor tapes depending on the test probes," IEEE Trans. Appl. Supercond., vol. 29, no. 5, pp. xxxxx, 2019.
  5. K. Osamura, S. Machiya, and D. P. Hampshire, "Mechanism for the uniaxial strain dependence of the critical current in practical REBCO tapes," Supercond. Sci. Technol., vol. 29, pp. 065019, 2016. https://doi.org/10.1088/0953-2048/29/6/065019
  6. K. Osamura, S. Machiya, D. P. Hampshire, Y. Tsuchiya, T. Shobu, K. Kajiwara, G. Osabe, K. Yamazaki, Y. Yamada, and J. Fujikami, "Uniaxial strain dependence of the critical current of DI-BSCCO tapes," Supercond. Sci. Technol., vol. 27, pp. 085005, 2014. https://doi.org/10.1088/0953-2048/27/8/085005
  7. T. Takematsu, et al., "Degradation of the performance of a YBCOcoated conductor double pancake coil due to epoxy impregnation," Physica C, vol. 470, pp. 674-677, 2010. https://doi.org/10.1016/j.physc.2010.06.009
  8. N. Cheggour, et al., "Effect of fatigue under transverse compressive stress on slit Y-Ba-Cu-O coated conductors," IEEE Trans. Appl. Supercond., vol. 17, no. 2, pp. 3063-3066, 2007. https://doi.org/10.1109/TASC.2007.897918
  9. A. Gorospe, and H. S. Shin, "Investigation on the electromechanical properties of RCE-DR GdBCO CC tapes under transversely applied load," Prog. Supercond. Cryog., vol. 16, no. 4, pp. 49-52, 2014. https://doi.org/10.9714/psac.2014.16.4.049
  10. J. W. Ekin, et al., "Transverse stress and fatigue effects in Y-Ba-CuO coated IBAD tapes," IEEE Trans. Appl. Supercond., vol. 11, no. 1, pp. xxxxx, 2001.
  11. A. Gorospe, M. J. Dedicatoria, and H. -S. Shin, "Influence of edge geometry on the delamination strength of REBCO CC tapes using anvil test method," IEEE Trans. Appl. Supercond., vol. 26, no. 4, pp. 1-5, 2016.
  12. N. Cheggour, et al., "Transverse compressive stress, fatigue, and magnetic substrate effects on the critical current density of Y-Ba-CuO coated RABiTS tapes," Advances in Cryogenic Eng., vol. 48, pp. 461-468, 2002. https://doi.org/10.1063/1.1472574
  13. K. P. Ko, et. al., "Fabrication of Highly Textured IBAD-MgO Template by Continuous Reel-to-Reel Process and its Characterization," Physica C, vol. 463-465, pp. 564-567. 2007. https://doi.org/10.1016/j.physc.2007.01.043
  14. M. A. Diaz, M. De Leon, H. S. Shin, B. J. Mean, and J. H. Lee, "System for characterizing the electromechanical properties of REBCO coated conductors through simultaneous measurements of critical current and mechanical load," Supercond. Sci. Technol., vol. 35, no. 5, pp. 055007, 2022. https://doi.org/10.1088/1361-6668/ac4d70
  15. M. A. Diaz, M. De Leon, H. S. Shin, B. J. Mean, and J. H. Lee, "Evaluation of the electromechanical performance of practical REBCO CC tapes under low magnetic fields using a continuous critical current measuring system at 77 K," IEEE Trans. Appl. Supercond., vol. 32, no. 6, 2022.
  16. M. De Leon, et al., "Interaction of cracks and precipitate particles on the REBCO superconducting layers of practical CC tapes through fractographic observations," Prog. Supercond. Cryog, vol. 22, no. 3, pp. 7-12, 2020.