Speaker
Description
The remarkable superconducting properties of REBCO tapes in high magnetic fields render them highly suitable for applications such as fusion magnets and particle accelerators. However, their mechanical limits under transverse tensile stresses from Lorentz forces and screening currents in high-field coils must be addressed for reliable performance. This study investigates the delamination behavior of commercial REBCO tapes subjected to transverse tension induced by an electromagnetic force. Magnetic fields up to 19 T and currents up to 2 kA generated transverse tensile stresses of the order of 10 MPa in 4 mm-wide samples. A custom-designed sample holder was developed, with the aid of numerical analyses, to minimize the hoop stress component. The reduction in critical current after delamination was assessed at 4.2 K and 77 K. Additionally, post-experiment analyses using inductive mapping of the local critical current density and SEM/EDX were performed, providing insights into distribution, mechanisms, and chemical nature of the damage. Forensic analyses revealed regions with changes in elemental composition, indicating quench events concomitant with the induced delamination.
| Session | EM & Mechanical Properties |
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