Elastic-plastic conductor damage evaluation at over 0.4% strain using a high-stress REBCO coil

Bang, Jeseok; Bradford, Griffin; Kim, Kwangmin; Lee, Jonathan; Polyanskii, Anatolii; Larbalestier, David

doi:10.1088/1361-6668/ad6a9d

Title: Elastic-plastic conductor damage evaluation at over 0.4% strain using a high-stress REBCO coil

Journal Article · 12 August 2024 · Superconductor Science and Technology

DOI: https://doi.org/10.1088/1361-6668/ad6a9d · OSTI ID:2429054

;

; Kim, Kwangmin; Lee, Jonathan;

;

Abstract Recent reports on screening current stress simulations of high-field REBCO magnets frequently present peak stresses over 1 GPa. However, this result is probably an unrealistic artifact of purely elastic calculations, considering the macroscopic yield and fracture stresses of approximately 900 MPa and less than 1.1 GPa for Hastelloy substrate-coated conductors. Here, we evaluate elastic-plastic conductor damage at over 0.4% strain using a high-stress REBCO coil exposed to a high field to explore this elastic-plastic regime. The coil was located off-center in a low-temperature superconductor magnet so as to induce a significant screening current in the enhanced radial field. Voltage taps, a Hall sensor, and two strain gauges were used for the instrumentation. We obtained strains exceeding 0.4% near the outward edge during the coil current charge from 350 A to 390 A, where the coil was exposed to external axial and radial magnetic fields of 13 T and 0.5 T. Post mortem results showed wavy plastic deformation, electrical damage, and REBCO defects. An elastic-plastic simulation reproduced the measured strains and predicted that ∼1 GPa stress is sufficient to induce ∼0.9% strain, thus validating our initial concerns with purely elastic models. This paper provides our experimental and simulation results.

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Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: SC0022011

OSTI ID:: 2429054

Journal Information:: Superconductor Science and Technology, Journal Name: Superconductor Science and Technology Journal Issue: 9 Vol. 37; ISSN 0953-2048

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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