Strain tolerance of multifilament Bi‐Pb‐Sr‐Ca‐Cu‐O/silver composite superconducting tapes

摘要: The bend strain characteristics of Bi‐Pb‐Sr‐Ca‐Cu‐O/silver composite tapes were determined from measurements the critical current, Ic(77 K), as a function (0%–2%) or radius curvature (∞−10 mm). powder‐in‐tube method was used to prepare monofilament and multifilament (up 49 filaments) tapes, 0.2–0.4 mm overall thickness, with 5–20 vol % superconductor. irreversible limit, eirr, for onset damage, increases number filaments eirr=0.2%–0.3% values up 1.5% 49‐filament tapes. Although strains beyond this limit cause damage in form microcracks fracture superconductor filaments, are exceptionally tolerant, retaining 85%–90% initial current at 2%.