Advertisement

Resistivity and RRR Measurements on Grooved SMES Aluminum Stabilizer Bar by the Eddy Current Decay Method

  • C. Y. Hua
  • J. Harper
  • K. T. Hartwig
Part of the An International Cryogenic Materials Conference Publication book series (ACRE, volume 40)

Abstract

Measurements are reported of resistivity at room temperature, 77K, and 4.2K on one inch diameter longitudinally grooved bars of pure aluminum. The application is superconducting magnetic energy storage (SMES) where long lengths of the superconductor stabilizer component must be qualified to a residual resistivity ratio (RRR) specification. The measurements are taken by the Eddy Current Decay (ECD) method and compared to similar measurements on ungrooved bars of the same material. Experimental results show that there exists a fixed ratio between time constants for the grooved and ungrooved bars. The ratio for the standard SMES aluminum stabilizer bar is about 0.45. It is expected that for large numbers of samples and measurements, significant savings will be realized using the ECD method as opposed to the conventional current transport method for RRR characterization.

Keywords

Groove Depth Solid Cylinder Pickup Coil Primary Coil Material Resistivity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1).
    C.P. Bean, R.W. BeBlois, and L. B. Nesbit, “Eddy Current Decay Method for Measuring the Resistivity of Metals,” Journal Of Applied Physics 1959, V. 30, No. 12, 1976.Google Scholar
  2. 2).
    A.F. Clark, et al., “The Eddy Current Decay Method for Resistivity Characterization of High Purity Metals,” NBS Special Publication 260–39, 1972.Google Scholar
  3. 3).
    K.T. Hartwig, L.C. McDonald, H. Zou, “Recent Developments with the Eddy Current Decay Method for Resistivity Measurements,” Advances In Cryogenic Engineering Materials, 1992, V 38B 1169.Google Scholar

Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • C. Y. Hua
    • 1
    • 2
  • J. Harper
    • 1
  • K. T. Hartwig
    • 1
  1. 1.Mechanical Engineering DepartmentTexas A&M UniversityCollege StationUSA
  2. 2.General Research Institute for Nonferrous MetalsBeijingChina

Personalised recommendations