S Ochiai et al 2007 Supercond. Sci. Technol. 20 202 doi:10.1088/0953-2048/20/3/015
S Ochiai1,6, H Rokkaku2, K Morishita2, J K Shin2, S Iwamoto2, H Okuda1, M Hojo2, K Osamura3, M Sato4, A Otto5, E Harley5 and A Malozemoff5
Show affiliationsA 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 77 K estimated by this method and the reported fracture strain of Bi2223 filaments accounted well for the measured strain tolerance of the critical current at 77 K.
74.25.Ld Mechanical and acoustical properties, elasticity, and ultrasonic attenuation
74.81.Bd Granular, melt-textured, amorphous and composite superconductors
Issue 3 (March 2007)
Received 19 October 2006, in final form 29 November 2006
Published 10 January 2007
S Ochiai et al 2007 Supercond. Sci. Technol. 20 202
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