Strain effects on the critical current of Bi-2223/Ag tape

摘要

Mechanical properties of Bi-2223/Ag tapes have been studies. The conductor's critical current (I_c) keeps nearly constant when the tensile strain is low than a critical value. As tensile strain increase, I_c decreases slowly at the beginning, and then degrades sharply near 0.3% of strain. Degradations of I_c caused by the bending strain are in good agreement with the tensile testing results. Synchrotron radiation shows that the degradation of I_c is related directly with propagation of micro-crack in the oxide layer under tensile tests.