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Strain tolerance of Ag-sheathed BSCCO (2223) superconductors with various geometrical configurations

Strain tolerance (retained critical current as a function of applied strain) of Ag-sheathed monofilament and wire-in-tube (WIT) tapes sintered for various time periods was evaluated. Strain tolerance of the WIT tapes sintered for 100 h was significantly lower than that of the monofilament tapes. This is attributed to a sharp increase in volume fraction of the superconducting core in WIT tapes (compared with that in monofilament tapes) subjected to a strain value greater than the fracture strain of BSCCO . This limitation was overcome by fabricating tube-within-tube tapes containing an additional BSCCO layer that runs along the neutral plane. Strain tolerance of these was superior to those of both the monofilament and the WIT configurations. This improvement is related to crack pinning effects induced by the inner Ag tube and by increased volume fraction of undamaged superconducting core. Experimental evidence indicates that the effective strain experienced by the current-carrying regions of the cross-section will determine the strain tolerance of the tape. At strains below 1% where there is a significant decrease in the volume fraction of superconducting core within subcritical strain, only a relatively low decrease in critical current density was observed, indicating possible current shunting in all of the tape configurations investigated.