Fatigue behavior of Y-Ba-Cu-O/hastelloy-C coated conductor at 77 K

Abdallah L. Mbaruku, Justin Schwartz

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

Superconducting materials are subjected to various loading in motors, transformers, generators, and other magnet applications. The loading conditions include bending, tension, compression, and fatigue, and result from coil manufacturing, thermal cycling, quenching, and normal operation. Each of these loading conditions can affect the performance of the superconductor and thus the magnet and system. It is important, therefore, to understand the electromechanical behavior of the superconducting material to optimize the design. Here we report the effects of mechanical fatigue at 77 K on the electrical transport properties of YBa2Cu3O 7-delta;/Hastelloy-C coated conductors. The effects of longitudinal tensile fatigue on the critical current and the n -value are reported. Strain controlled fatigue studies include strains up to 0.495% and strain ratios of 0.2 and 0.5. Scanning electron micrographs of the fatigued conductors are used to identify the sources of failure. Crack formation is believed to be the cause of Ic degradation in fatigued samples. Further, the fatigue strength and ductility behaviors analyzed using a S % reduction in Ic as the electrical definition of failure showed that the fatigue strength exponent is within the values found for metals but both the fatigue ductiUty coefficient and exponent show that the material tested is brittle.

Original languageEnglish (US)
Article number4616552
Pages (from-to)1743-1752
Number of pages10
JournalIEEE Transactions on Applied Superconductivity
Volume18
Issue number3
DOIs
StatePublished - Sep 1 2008

All Science Journal Classification (ASJC) codes

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

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