Flux-Pinning-Induced Stress and Deformation Analyses of a Long Rectangular Superconducting Bicrystal
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The flux-pinning-induced stress and deformation of a long rectangular superconducting bicrystal with an arbitrary aspect ratio are analyzed based on the critical-state model and the finite element numerical method. The flux and current distributions in the superconductor with a low-angle grain boundary (GB) are obtained based on a constant GB critical current density assumption. The distributions of the stresses within the superconductor are obtained for different magnetization stages. The deformation and especially the shape distortion in the irreversible magnetostriction of the superconductor are analyzed. In addition, the relation between the maximum stress on the grain boundary and the ratio of the GB critical current density to the grain critical current density is discussed when the applied magnetic field is reduced to zero.
KeywordsBicrystal Grain boundary Shape distortion Finite element numerical
This research was supported by a grant of the Fund of Natural Science Foundation of China (Nos. 11402073 and 11372096), the China Postdoctoral Science Foundation (No. 2013M531260), the Fund of Natural Science Foundation of Jiangsu Province (No. BK20130824), the Program for Research Fund for the Doctoral Program of Higher Education of China, and the Fundamental Research Funds for the Central Universities (No. 2013B05014).