Multi-field coupling analysis of REBCO superconductors under pulsed magnetic fields
In order to explore the capture magnetic field,temperature and stress distribution characteristics of REBCO su-perconducting materials after pulsed magnetization,a two-dimensional axisymmetric model was established based on the H method considering the structural symmetry of cylindrical superconductors.The magnetoelastic and heat conduction models of su-perconducting cylinders during pulsed magnetization are solved.The results show that in the rising stage of the pulsed magnetic field,the penetration depth of the magnetic flux increases with the enhancement of the pulsed magnetic field.The flux completely penetrates the superconductor when t/(τ)=1,the magnetic flux reaches a peak of 6.95 T at the surface.In the decreasing stage of the magnetization,the superconductors are all penetrated by the magnetic flux.The captured magnetic field along the radius de-creases with the decrease of the pulsed field.In addition,it is found by comparing the loop thermal stress and total stress curves in the demagnetization stage that the proportion of the loop thermal stress in the total stress at different moments reaches 86.7％,indicating that the superconductor REBCO is subjected to a combination of thermal and electromagnetic stresses under the envi-ronment of pulsed magnetic field action,and that the thermal stress occupies a dominant role.
Superconducting materialPulsed magnetizationH-methodTrapped magnetic fieldStress
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