Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Determination of winding diameter based on bending strain analysis for REBCO coated conductor tapes

  • Leon, M.B. De (Department of Mechanical Engineering, Andong National University) ;
  • Dedicatoria, M.J. (Department of Mechanical Engineering, Andong National University) ;
  • Shin, H.S. (Department of Mechanical Engineering, Andong National University)
  • Received : 2012.03.22
  • Accepted : 2012.04.19
  • Published : 2012.05.31
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Abstract

In order to recognize the allowable bending diameter in coils, the strain as function of diameters is evaluated. The irreversible strain limits of $I_c$ in the easy and hard bending modes were measured. Strains were calculated at the coating film in the easy bending and at outer edge or inner edge in the hard bending of the CC tape, respectively. The tape geometry subjected to bending procedures is considered from the current industrial spool winding operation. Through the linear superposition of strain induced in different bending modes regarding the expressions, the appropriate design for critical bending diameter is suggested. Results proved that the existence of buckling resulting from bending in hard direction when applied strain exceeded 0.6% is possible. The depicted results showed that the strain limit as a viable parameter should be considered for future purposes.

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References

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  1. Evaluation of electrical fatigue limits in REBCO coated conductor tapes through static fatigue testing at 77 K vol.35, pp.2, 2012, https://doi.org/10.1088/1361-6668/ac32ac