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

Kovac, P.; Kopera, L.; Melisek, T.; Sarmiento, G.; Sanz, Santiago; Brisigotti, S.; Nardelli, Davide; Tropeano, Matteo

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

Files

kovac_IEEE_Trans_2015.pdf (1.16 MB)

Identifiers

URI: http://hdl.handle.net/11556/156

ISSN: 1558-2515

DOI: 10.1109/TASC.2014.2379723

Publication date

2015-04

Authors

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA

Citations

Export

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.

Keywords

Bending stress , critical current degradation , ex situ MgB2 tape , neutral axis , strain tolerances , tensile stress

Type

journal article

Citation

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol 25, Issue 2, (2015)

Full item page