2012 Volume 47 Issue 10 Pages 605-609
A trapped field magnet is one application for a melt-processed bulk high-Tc superconductor (HTS). In the magnetization process via field cooling of the bulk HTS, stresses are induced by the Lorentz force between shielding currents and magnetic fields. Evaluation of the maximum stress during magnetization is important from the viewpoint of destruction of the bulk HTS. In the present paper, stresses in a hollow cylindrical bulk HTS are numerically evaluated using an axisymmetric threedimensional model. Shielding current distributions are obtained through macroscopic numerical simulation using Maxwell equations and the critical-state model. Hoop stress distributions are obtained for both open and fixed boundary conditions. In the analysis of field-cooled magnetization, the maximum hoop stresses are discussed for both a hollow model and a stacked model.
