Strain tolerance and tensile strength of Ag-added mono and multifilamentary (Bi, Pb)-2223/Ag tapes

Mechanical strain/stress in superconducting composites leads to degradation of their transport properties. We have studied this effect on mono and mul tifilamentary (Bi, Pb)-2223/Ag tapes by adding different percentages of AgN O3 (Ag: 0-7 wt%). AS samples were subjected to increasing bending strains, we measured the critical current I-c at 77 K, 0 T after each cycle to deter mine the strain Limit (epsilon (irr)) before degradation of I-c. Similarly, the stress tolerance of the sample under the tensile mode was found by hol ding the sample in a vertical axis within liquid nitrogen and by applying t he desired tensile load. Bending study results show that epsilon (irr) Of a 25-filament multifilamentary tape is double that of a monofilamentary tape , while epsilon (irr) increases with the increasing percentage of AgNO3 in both types of tape. The stress tolerance of multifilamentary tapes was foun d to be superior to that of monofilamentary tape and in both cases it was i mproved significantly by the addition of Ag.