Hoop stress test of GdBa2Cu3Oy coated conductor

Gen Nishijima, Kazuhiro Minegishi, Satoshi Awaji, Kazuo Watanabe, Teruo Izumi, Yuh Shiohara

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Mechanical property of GdBa2Cu3Oy(GdBCO) coated conductor was investigated at 4.2 K in a magnetic field by two ways, which are the tensile test and the hoop stress test. The tensile stress/strain dependence of critical current (Ic) of a 2 mm width conductor was explored at 4.2 K, 18 T. The result provided that Ic-reversible strain limit existed in between 0.43% and 0.46%, corresponding to 907 MPa and 960 MPa in stress, and the elastic constant was 203 GPa. The hoop stress test has been performed at 4.2 K, 11 T. A test coil was fabricated by winding a 5 mm width conductor on a 270 mm diameter GFRP bobbin by 1.5 turns. The maximum value of applied hoop stress, which was deduced from a product of magnetic field, current density and coil radius, was 1322 MPa. Five strain gauges glued on the conductor surface showed almost the same values, which were in a range of 0.64% to 0.67%, indicating the uniform longitudinal deformation. Furthermore, the hoop stress-strain characteristics were linear, suggesting an elastic deformation. The deduced elastic constants were in a range of 196-204 GPa. It was confirmed that the GdBCO coated conductor performance was deteriorated irreversibly by 1322 MPa hoop stress, whereas not by 1302 MPa hoop stress.

Original languageEnglish
Article number5629453
Pages (from-to)3094-3097
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume21
Issue number3 PART 3
DOIs
Publication statusPublished - 2011 Jun 1

Keywords

  • Coated conductor
  • GdBCO
  • Hoop stress
  • Mechanical property

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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