Study on Failure and Structural Buckling of Ultra-High Field Pulsed Magnets
Xiao Houxiu1,2, Huang Yu1,2
1. Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan 430074 China;
2. School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China
The theory of structural mechanics shows that magnet failure can be attributed to over-stress failure or windings buckling. The present magnet failure model is based on the stress model and ignores the problem of structural instability, which makes it impossible to explain why ultra-high fieldmagnets frequently sustain damage at low stress levels. However, the mechanism and criterion of buckling in pulsed magnets are still unclear. Previous study has indicated that buckling is another significant cause of ultra-high field pulsed magnet failure. In this paper, the free-standing layer of the pulsed magnet can be equivalent to a thin-walled cylindrical shell with a high risk of buckling. A failure analysis method of ultra-high-field pulsed magnets based on the buckling of the cylindrical shell structure, along with an Ansys finite element model of the static electromagnetic buckling, is proposed. The simulation results match well with the experimental results. The buckling analysis shows that: the axial electromagnetic force is the key factor for buckling, while the radial electromagnetic force has no significant effect on the axial buckling of the outer winding, and itcan suppress the axial buckling of the inner winding to some extent; in terms of winding structure, the outer winding is more sensitive to the spiral winding gap and needs to be focused on.
肖后秀, 黄煜. 超高场脉冲磁体失效及结构屈曲研究[J]. 电工技术学报, 2022, 37(19): 5067-5073.
Xiao Houxiu, Huang Yu. Study on Failure and Structural Buckling of Ultra-High Field Pulsed Magnets. Transactions of China Electrotechnical Society, 2022, 37(19): 5067-5073.
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