Philippine E-Journals

Residual Stress/Strain Analysis for REBCO Coated Conductor Tape Design

John Ryan C. Dizon | Rodrigo C. Munoz Jr. | Hyung-seop Shin

Discipline: Engineering, Technology

 

Abstract:

REBCO-based Coated Conductor (CC) High-Temperature Superconducting (HTS) tapes are now being used for practical device applications such as motors, generators, and power cables. The residual stresses and strains induced in the ReBCO coatings in HTS tapes during deposition and cool down from deposition temperature to operation temperature contributes on its performance, especially the electrical transport property. The stresses occur because of the different thicknesses as well as thermal expansion coefficients of the REBCO film, the buffer layer, and substrate materials. In this study, the residual stress/ strain induced in the superconducting coating in CC tapes was calculated from deposition temperature to cryogenic temperature computer simulation using a commercial software. A 2-dimensional analysis has been conducted where the thicknesses of constituent layers (i.e. Silver, REBCO film, and Substrate) were varied in order to understand the induced residual stress/strain with increasing thickness. The results show that with increasing REBCO thickness, the induced compressive residual stress in the REBCO film layer decreased. On the other hand, when the silver and substrate layers were increased, the induced compressive residual stress in the REBCO film layer increased. The data is important for the design of coated conductors for practical device applications. In the future, a 3-dimensional simulation for residual stress analysis would also be important.