Transverse resistance variations in helically wound 2G ReBCO high-temperature superconducting tape with core under transverse cycling and bending loads

Abstract

The variations in normalized transverse resistance of 2G HTS tape in a helically wound configuration with the core were measured at room temperature (RT) and 77 K under transverse cyclic and three-point bending loads. The observed experimental phenomena were explained by considering the differences in gap sizes between the superconducting tape and copper core, as well as between the superconducting tapes when multiple tapes are wound during sample preparation and cooling. By analyzing the impact of winding parameters, we offer engineering recommendations to mitigate the increase in transverse resistance and enhance the bearing ability of superconducting tapes under transverse cyclic and three-point bending loads at 77 K. These recommendations include augmenting pre-tension during the winding process, reducing sample placement time before testing, increasing the copper core radius and winding angle, as well as reducing the number of winding tapes.