J(C) VS. STRAIN CHARACTERISTIC OF BI-2223 AG COMPOSITE TAPES IN APPLIED MAGNETIC-FIELD/

In operative conditions of the most important transport applications o f Bi-2223/Ag super conducting tapes, like cables for power transmissio n lines and superconducting windings, the tapes will be subjected to m echanical stresses and magnetic fields causing the degradation of thei r transport properties. In this work we investigated the simultaneous effects of mechanical tensile stress and magnetic fields, up to 140 mT , applied parallel and perpendicular to the tape surface on the critic al current density J(c) at 77 K of Bi-2223/Ag composite tapes. The J(c ) vs. strain measurements showed an abrupt J(c) decay above a critical strain value, epsilon(cr).