Crack growth for a long rectangular slab of superconducting trapped-field magnets

Abstract

We use numerically evaluated contour integrals and crack length versus time analysis to simulate crack propagation based on electromagnetic forces for superconducting trapped-field magnets. The coupling finite element and infinite element method has been employed in the numerical analysis. In this paper an interior elliptical crack is allowed to grow based on the critical stress criterion. Stress intensity factors and J integrals are estimated during field descent. Crack propagation is modeled by the change of crack length with time, and contours of the Mises equivalent stress at the final stage of the crack propagation are shown.