Transport properties of multifilamentary Ag-sheathed Bi-2223 tapes under the influence of strain

Takanobu Kiss, Hans Van Eck, Bennie Ten Haken, Herman H.J. Ten Kate

Research output: Contribution to journalConference articlepeer-review

21 Citations (Scopus)

Abstract

Current-voltage (I-V) characteristics in multifilamentary Ag/Bi2223 tapes are investigated as a function of mechanical strain. As is well known, the critical current, Ic, in axially elongated tape remains almost constant up to a strain around 0.5%, then is followed by a sharp reduction. However, for larger elongations, a long tail in the Ic-strain curve is observed, i.e., around 20% of the initial Ic still remains even at 0.8% strain. The irreversible Ic reduction indicates that the degradation comes from the break-down of superconducting filaments. However, it is observed that the rupture risk probability reduces as the strain is increased in the long tail. This anomaly suggests that the measured strain of the whole tape is not identical to that of the HTS filaments inside the tape. We propose a model to describe the mechanical properties of the tape. It is shown that 1) the break-down probability of the filaments is well described by the Weibull function if we calculate the influence of shearing between the superconducting filaments and the surrounding Ag sheath, 2) the Ic-strain properties can be described accurately by the model, 3) transport I-V characteristics can also be described simultaneously as a function of strain.

Original languageEnglish
Pages (from-to)3888-3891
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume11
Issue number1 III
DOIs
Publication statusPublished - Mar 2001
Event2000 Applied Superconductivity Conference - Virginia Beach, VA, United States
Duration: Sep 17 2000Sep 22 2000

All Science Journal Classification (ASJC) codes

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

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