Magneto-optical imgaing study of the crack formation in superconducting tapes caused by applied strain

D.C. van der Laan, H.J.N. van Eck, H.J.N. van Eck, M.W. Davidson, Bernard ten Haken, Herman H.J. ten Kate, J. Schwartz

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Abstract

The crack formation in filaments of multi-filamentary Bi2Sr2Ca2Cu3Ox tapes as function of applied longitudinal strain is visualized by means of magneto-optical imaging. Strain is applied at the desired temperature inside a helium flow cryostat. Cracks form transverse to the current carrying direction of the filaments. Before the tape breaks entirely, all filaments have formed a large number of transverse cracks, spaced with an average crack distance of ≈200 μm. The crack formation is compared with the degradation of the critical current as a function of the applied strain. The critical current degrades already before the first crack is observed. This is explained by the limited number of filaments visible in the experiment.
Original languageUndefined
Pages (from-to)1020-1023
Number of pages4
JournalPhysica C
VolumePart II
Issue numberPart 2
DOIs
Publication statusPublished - 2002

Keywords

  • Crack formation
  • Longitudinal strain
  • IR-74759
  • Magneto-optical imaging
  • METIS-206806
  • Superconductors

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