Axial and bending strain effects in Ag and AgNiMg/Bi-2212 wires

Damage evolution under bending and tensile stress and its influence on critical current of Bi2223/Ag superconducting composite tape

“…The strain-dependence of critical current is dependent on the fabrication process and structure of the composite such as size and volume fraction of the constituents (Bi2223, silver and silver alloy sheath), as known from the comparison of the reported results [1][2][3][8][9][10][11][12][13][14][15][16]. Taking the case of the bending effect, the reduction in critical current with increasing strain has been attributed mostly to the damage in the tensile side.…”

“…The tensile fracture strain of the Bi2223 filaments has been reported to be around 0.1% [2][3][4], being several to ten times lower than that of other superconducting filaments such as Nb 3 Sn (0.5-1.2%) [5,6] and Nb 3 Al (0.6-1.0%) for fusion uses [7]. Thus, under the applied strain, the critical current of Bi2223 composite is reduced severely [1][2][3][8][9][10][11][12][13][14][15][16].…”

Statistical analysis of the electromechanical behavior of AgMg sheathed Bi2Sr2CaCu2O8+x superconducting tapes using Weibull distributions

“…[4][5][6] Since the earliest work, 7,8 data have been reported in terms of a critical strain value c . [4][5][6] Since the earliest work, 7,8 data have been reported in terms of a critical strain value c .…”

Effect of twisting on strain tolerance of Bi-2212 multifilamentary round wires

“…3 Improvement of the strain tolerance of the superconducting wires is necessary for their practical use. There have been several attempts to improve the silver sheathed wires: 4 ͑a͒ changing the structure of multifilament division, 5 ͑b͒ using reinforced silver alloy sheath, 6 ͑c͒ adding silver particles 7 or aligned MgO whiskers 8 to the oxide superconductor, etc. It is easily understood that any addition to the superconductor degrades the J c and that the alloy sheath affects the J c by diffusion.…”