Flux-Pinning-Induced Stress and Deformation Analyses of a Long Rectangular Superconducting Bicrystal
Flux-Pinning-Induced Stress and Deformation Analyses of a Long Rectangular Superconducting Bicrystal
复制标题
长矩形超导双晶的磁通钉扎应力和变形分析
DOI：
10.1007/s10948-016-3612-1
复制
发表时间：
2016
影响因子：
1.8
通讯作者：
苟晓凡
中科院分区：
文献类型：
--
作者：
薛峰;张文卿;曾军;苟晓凡
基于临界状态模型和有限元数值方法，分析了任意长径比的长矩形超导双晶的磁通钉扎应力和变形。在晶界临界电流密度为常数的假设下，得到了具有小角度晶界的超导体中磁通和电流的分布。得到了不同磁化阶段超导体内部的应力分布。分析了超导体在不可逆磁致伸缩过程中的形变，特别是形状畸变。此外，还讨论了外加磁场为零时晶界上的最大应力与晶界临界电流密度与晶粒临界电流密度之比的关系。
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.