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    Tensile and Bending Strain Tolerance of Ex Situ MgB2/Ni/Cu Superconductor Tape

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    kovac_IEEE_Trans_2015.pdf (1.156Mb)
    Identifiers
    URI: http://hdl.handle.net/11556/156
    ISSN: 1558-2515
    DOI: 10.1109/TASC.2014.2379723
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    Author/s
    Kovac, P.; Kopera, L.; Melisek, T.; Sarmiento, G.; Sanz, Santiago; [et al.]
    Date
    2015-04
    Keywords
    Bending stress
    critical current degradation
    ex situ MgB2 tape
    neutral axis
    strain tolerances
    tensile stress
    Abstract
    This paper describes the strain tolerance of MgB2/Ni/Cu tape produced by Columbus Superconductors subjected to tension and bending stress. A tension test instrument with freestanding sample was used for stress-strain, I-c-stress, and I-c-strain characteristics at liquid helium temperature. Bending of MgB2/Ni/Cu tape to variable diameters was done at room temperature and in two directions: 1) with a Cu strip on the outer surface (Cu out) of a bent sample; and 2) with a Cu strip on the inner side (Cu in). I-c-bending strain characteristics were measured at 4.2 K and external field B = 6 T oriented perpendicularly to the sample's width. Obtained results have shown the strain limits, which should not be exceeded during the winding process of superconductor containing brittle MgB2 filaments.
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    article

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