Quench characteristics and mechanical responses during quench propagation in rare earth barium copper oxide pancake coils

doi:10.1007/s10483-021-2699-6

Abstract

Abstract: Quench and mechanical behaviors are critical issues in high temperature superconducting (HTS) coils. In this paper, the quench characteristics in the rare earth barium copper oxide (REBCO) pancake coil at 4.2 K are analyzed, and a two-dimensional (2D) axisymmetric electro-magneto-thermal model is presented. The effects of the constituent materials, background field, and coil size are analyzed. An elastoplastic mechanical model is used to study the corresponding mechanical responses during the quench propagation. The variations of the temperature and strain in superconducting layers are compared. The results indicate that the radial strain evolutions can reflect the transverse quench propagation and the tensile hoop and radial stresses in superconducting layers increase with the quench propagation. The possible damages are discussed with the consideration of the effects of the background field and coil size. It is concluded that the high background field significantly increases the maximum tensile hoop and radial stresses in quenching coils and local damage may be caused.

Key words: rare earth barium copper oxide (REBCO) pancake coil, hoop stress, quench characteristic, mechanical response, radial stress

2010 MSC Number:

Mengdie NIU, Jing XIA, Huadong YONG, Youhe ZHOU. Quench characteristics and mechanical responses during quench propagation in rare earth barium copper oxide pancake coils. Applied Mathematics and Mechanics (English Edition), 2021, 42(2): 235-250.

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References

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