Effect Of Mechanical Loading On The Ic Degradation Behavior Of Bi-2223 Tapes

During the winding process of HTS coils the tapes of Bi-2223 are subjected to the influence of bending strain, axial strain, compressive force and torsional deformation resulting in Ic degradation. In the literature the effects of the individual strain components are separately analyzed in spite of during coil winding and energizing the strain-stress effects are combined. In this work using commercial tapes of Bi-2223 Ag/AgMg with and without stainless steel reinforcement several samples were wound on cylindrical FRP G-10 holder in which different combined strains are applied. Measurements of I - V characteristic curves are done to determine the degree of critical current degradation and the operational limits. The results are compared with the J c values of short samples and other specimens subjected to deformation generated by loading types such as tensile and bending strain. © 2005 IEEE.152 PART III35523555Kellers, J., Masur, L.J., Reliable commercial HTS wire for power applications (2002) Phys. C, 372-376, pp. 1040-1045Jin, J.X., Critical current degradation caused by winding process of Bi-2223/Ag HTS wire in the form of a coil (1999) IEEE Trans. Appl. Supercond., 9, pp. 138-141Ten Haken, B., Benuink, A., Ten Kate, H.H.J., Small and repetitive axial strain reducing the critical current in BSCCO/Ag superconductors (1997) IEEE Trans. Appl. Supercond., 7, pp. 2034-2037Kiss, T., Transport E-J characteristics in Bi-2223 tapes under the influence of bending strain: Analysis by use of the percolation model (2001) Phys. C, 357-360, pp. 1123-1127Ha, H.S., The effect of thermal cycling and axial strain on the Ic degradation of multi-filamentary Bi-2223/Ag tapes (2004) Phys. C, Pt. 2, 412-414, pp. 1096-1100Ahoranta, M., Lehtonen, J., Kovác, I., Husek, I., Melisek, T., Effect of bending and tension on the voltage-current relation of Bi-2223/Ag (2004) Phys. C, 401, pp. 241-245Sugano, M., Osamura, K., Nyilas, A., Analysis of stress-strain behavior in Bi-2223 composite tapes (2004) Phys. C, Pt. 2, 412-414, pp. 1114-1119Shin, H.S., Choi, S.Y., Ha, H.S., Ha, D.W., Oh, S.S., Ic degradation behavior in Bi-2223 superconducting tapes under torsional deformation (2003) Phys. C, 392-396, pp. 1162-1166Baldan, C.A., Design and test of HTS coils for resistive fault current limiter (2004) IEEE Trans. Appl. Supercond., 14, pp. 863-86