Enhanced critical axial tensile strain limit of CORC^® wires: FEM and analytical modeling

Abstract Conductor on Round Core (CORC ® ) cables and wires are composed of spiraled high-temperature superconducting (HTS) rare-earth barium copper oxide (REBCO) tapes, wound in multiple layers, can carry very high currents background magnetic fields more than 20 T. They combine isotropic flexibility resilience to electromagnetic thermal loads. The brittle nature HTS tapes limits the maximum allowable axial tensile strain cables. An intrinsic above about 0.45% will introduce cracks REBCO layer straight resulting irreversible damage. helical fashion at which around central core allows experience only a fraction total applied CORC wire. As result, critical limit be increased by factor 10 that tapes. Finite element (FE) analytical models developed predict performance under strain. A parametric analysis is carried out varying winding angle, Poisson’s ratio wire core, diameter, tape width. results show small variation angle have significant impact cable’s tolerance. While radial contraction helically depends its it mostly driven affecting state thus performance. Contact pressure from layers within also affects FE model used optimize cable design for specific application conditions, an as 7%.