Title :
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
fDate :
7/1/1994 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
