Effect of GFRP spacer on local deformation of large superconductor in coil pack

Author

Nishimura, Arata ; Tamura, Hitoshi ; Mito, Toshiyuki ; Yamamoto, Junya

Author_Institution

Nat. Inst. for Fusion Sci., Gifu, Japan

Volume

30

Issue

4

fYear

1994

fDate

7/1/1994 12:00:00 AM

Firstpage

1887

Lastpage

1890

Abstract

Local deformation in a large superconductor caused by GFRP spacers and epoxy adhesives was investigated after compressive rigidity testing. The epoxy adhesive used for attaching the GFRP spacers to the superconductor changes shape from an almost square sheet into a lens-like sheet during deformation, and a dent appeared on the surface of the superconductor. Three-dimensional FEM analysis showed that a compressive stress in the vertical direction of the loading axis existed in the adhesive plane. This stress component makes the adhesive lens-like and it results in the dent created during the compressive testing. This local deformation should yield a part of the permanent deformation observed after the compressive load cycle at 4.2 K

Keywords

Tokamak devices; finite element analysis; fusion reactor materials; fusion reactor theory and design; superconducting magnets; 3D FEM analysis; 4.2 K; GFRP spacer; Large Helical Device; NbTi; coil pack; compressive load cycle; compressive rigidity testing; compressive stress; dent; epoxy adhesives; finite element analysis; fusion reactor; large superconductor; lens-like sheet; local deformation; permanent deformation; stress component; vertical direction; Capacitive sensors; Compressive stress; Conductors; Cryogenics; Joining processes; Shape; Superconducting coils; Superconducting magnets; System testing; Wounds;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.305630

Filename

305630