超高场脉冲磁体失效及结构屈曲研究

doi:10.19595/j.cnki.1000-6753.tces.211714

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Abstract

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.

Key words： High magnetic field pulsed magnets free-standing layers buckling

Received: 26 October 2021

PACS:	TM551
	O342

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	Xiao Houxiu
	Huang Yu

Cite this article:

Xiao Houxiu,Huang Yu. Study on Failure and Structural Buckling of Ultra-High Field Pulsed Magnets[J]. Transactions of China Electrotechnical Society, 2022, 37(19): 5067-5073.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.211714 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I19/5067

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