Engineering the precompression of B1,Pb(2223): The influence of the geometry of the metallic matrix on the mechanical properties of tapes

At relatively low tensile strain ( epsilon ) levels, Bi,Pb(2223) tapes show a strain insensitive plateau in their I sub(c)( epsilon ) behavior. The "Irreversible I sub(c) Reduction Model" explains this regime as due to the irreversible damage caused by the precompression of the ceramic fil...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2001-03, Vol.11 (1 III), p.3018-3021
Main Authors: Passerini, R, Dhalle, M, Witz, G, Seeber, B, Flukiger, R
Format: Article
Language:English
Online Access:Get full text
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Summary:At relatively low tensile strain ( epsilon ) levels, Bi,Pb(2223) tapes show a strain insensitive plateau in their I sub(c)( epsilon ) behavior. The "Irreversible I sub(c) Reduction Model" explains this regime as due to the irreversible damage caused by the precompression of the ceramic filaments by the metal matrix. In this paper we investigate whether this damage occurs predominantly during the cool-down from the reaction temperature to room temperature, or during the cryogenic refrigeration. Furthermore, we present I sub(c)( epsilon ) data on a range of tapes with different superconductor-to-matrix ratio and different tape geometry, showing how these factors influence the precompression. A modification of the "Irreversible I sub(c) Reduction Model" is proposed to take into account "connected-grains" domains in the I sub(c)( epsilon ) behavior.
ISSN:1051-8223
DOI:10.1109/77.919698