Mechanical properties of Bi,Pb(2223) single filaments and Ic(ε) behaviour in longitudinally strained tapes

Reynald Passerini, Marc Dhallé, Bernd Seeber, René Flükiger

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

The Young's modulus and fracture stress of isolated Bi,Pb(2223) filaments were deduced from three-point bending tests performed at different stages of the tapes preparation. These results were introduced in the model describing the evolution of critical current of tapes submitted to a longitudinal strain in view to predict their irreversible strain limit εirr. These calculated irreversible strain limits were compared to measured values, taken from a set of tapes made with different filling factors and composite matrices. This experiment shows that the predicted irreversible strain limits correspond to the measured ones. Presenting the Ic behaviour of highly stressed tapes in a magnetic field, we discuss the evolution of the ratio Ic0strong/Ic0 versus strain. This value, representative of the fraction of the critical current attributed to strongly connected grains, increases significantly during the crack formation regime at ε > εirr. This indicates that mechanically weak links correspond to electromagnetically weak ones. This result is further confirmed by comparing the modulus of rupture obtained in single filaments extracted from tapes with different Ic values.

Original languageEnglish
Pages (from-to)1507-1511
Number of pages5
JournalSuperconductor Science and Technology
Volume15
Issue number11
DOIs
StatePublished - Nov 2002
Externally publishedYes

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