Thermally induced residual strain accumulation in Bi2223/Ag/Ag alloy composite superconductor

S. Ochiai, H. Rokkaku, Kohei Morishita, J. K. Shin, S. Iwamoto, H. Okuda, M. Hojo, K. Osamura, M. Sato, A. Otto, E. Harley, A. Malozemoff

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

A method to estimate the thermally induced residual strain accumulation under varying temperature in a Bi2223/Ag/Ag alloy composite superconductor was presented, in which the mechanical property values measured from the stress-strain curves of the samples with different residual strain states, the residual strain value of Bi2223 filaments in the composite tape at room temperature measured by x-ray diffraction and the reported coefficients of thermal expansion of the constituents (Bi2223, Ag and Ag alloy) in the relevant temperature range were incorporated. This method was applied to estimate the change of the residual strain of all constituents of the high critical current type composite tape fabricated by American Superconductor Corporation as a function of temperature. The residual strain value at 77K estimated by this method and the reported fracture strain of Bi2223 filaments accounted well for the measured strain tolerance of the critical current at 77K.

Original languageEnglish
Article number015
Pages (from-to)202-210
Number of pages9
JournalSuperconductor Science and Technology
Volume20
Issue number3
DOIs
Publication statusPublished - Mar 1 2007

Fingerprint

Superconducting materials
tapes
composite materials
critical current
filaments
Composite materials
Critical currents
estimates
Tapes
temperature
thermal expansion
x ray diffraction
mechanical properties
Temperature
room temperature
curves
coefficients
Stress-strain curves
Thermal expansion
Diffraction

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

Thermally induced residual strain accumulation in Bi2223/Ag/Ag alloy composite superconductor. / Ochiai, S.; Rokkaku, H.; Morishita, Kohei; Shin, J. K.; Iwamoto, S.; Okuda, H.; Hojo, M.; Osamura, K.; Sato, M.; Otto, A.; Harley, E.; Malozemoff, A.

In: Superconductor Science and Technology, Vol. 20, No. 3, 015, 01.03.2007, p. 202-210.

Research output: Contribution to journalArticle

Ochiai, S, Rokkaku, H, Morishita, K, Shin, JK, Iwamoto, S, Okuda, H, Hojo, M, Osamura, K, Sato, M, Otto, A, Harley, E & Malozemoff, A 2007, 'Thermally induced residual strain accumulation in Bi2223/Ag/Ag alloy composite superconductor', Superconductor Science and Technology, vol. 20, no. 3, 015, pp. 202-210. https://doi.org/10.1088/0953-2048/20/3/015
Ochiai, S. ; Rokkaku, H. ; Morishita, Kohei ; Shin, J. K. ; Iwamoto, S. ; Okuda, H. ; Hojo, M. ; Osamura, K. ; Sato, M. ; Otto, A. ; Harley, E. ; Malozemoff, A. / Thermally induced residual strain accumulation in Bi2223/Ag/Ag alloy composite superconductor. In: Superconductor Science and Technology. 2007 ; Vol. 20, No. 3. pp. 202-210.
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AU - Iwamoto, S.

AU - Okuda, H.

AU - Hojo, M.

AU - Osamura, K.

AU - Sato, M.

AU - Otto, A.

AU - Harley, E.

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AB - A method to estimate the thermally induced residual strain accumulation under varying temperature in a Bi2223/Ag/Ag alloy composite superconductor was presented, in which the mechanical property values measured from the stress-strain curves of the samples with different residual strain states, the residual strain value of Bi2223 filaments in the composite tape at room temperature measured by x-ray diffraction and the reported coefficients of thermal expansion of the constituents (Bi2223, Ag and Ag alloy) in the relevant temperature range were incorporated. This method was applied to estimate the change of the residual strain of all constituents of the high critical current type composite tape fabricated by American Superconductor Corporation as a function of temperature. The residual strain value at 77K estimated by this method and the reported fracture strain of Bi2223 filaments accounted well for the measured strain tolerance of the critical current at 77K.

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