Kim model for flux-pinning-induced stress in a long cylindrical superconductor

Zeng, Jun; Wang, Xiaogui; Wu, Huaping; Xue, Feng; Zhu, Jing

doi:10.1063/1.4958880

Cited by 9 publications

(3 citation statements)

References 33 publications

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“…In addition, the mechanical characteristics and crack problems were considered for HTS tape and cylindrical superconductors [35][36][37][38][39][40][41][42][43]. On the basis of previous investigations, a series of studies on the complicated structure and environment were presented [44][45][46][47][48][49][50][51]. Recently, Fujishiro et al investigated the stresses of REBaCuO superconducting ring bulks reinforced by a metal ring under FC magnetization, and they also investigated the total stress induced by electromagnetic stress plus thermal stress during the cooling down [27,52].…”

Section: Introductionmentioning

confidence: 99%

Stress analysis in high-temperature superconductors under pulsed field magnetization

Wu¹,

Yong²,

Zhou³

2018

Supercond. Sci. Technol.

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Bulk high-temperature superconductors (HTSs) have a high critical current density and can trap a large magnetic field. When bulk superconductors are magnetized by the pulsed field magnetization (PFM) technique, they are also subjected to a large electromagnetic stress, and the resulting thermal stress may cause cracking of the superconductor due to the brittle nature of the sample. In this paper, based on the H-formulation and the law of heat transfer, we can obtain the distributions of electromagnetic field and temperature, which are in qualitative agreement with experiment. After that, based on the dynamic equilibrium equations, the mechanical response of the bulk superconductor is determined. During the PFM process, the change in temperature has a dramatic effect on the radial and hoop stresses, and the maximum radial and hoop stress are 24.2 MPa and 22.6 MPa, respectively. The mechanical responses of a superconductor for different cases are also studied, such as the peak value of the applied field and the size of bulk superconductors. Finally, the stresses are also presented for different magnetization methods.

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Section: Introductionmentioning

confidence: 99%

Stress analysis in high-temperature superconductors under pulsed field magnetization

Wu¹,

Yong²,

Zhou³

2018

Supercond. Sci. Technol.

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“…a / (2) The field B 0 * < can be retained for any B a varying from 4B p to 0 when db dt 6.55 s . Although some investigators consider the validity of the Bean model is questionable for an extensive analysis of the elastic behavior [28,30], to our knowledge, no research has been carried out to confirm that the mechanical properties calculated by the Kim model are more accurate than those using the Bean model. As found from our calculations, the more physical contents are revealed by the Kim model combining with the viscous flux flow, such as the effect of B a on υ 0 /w and new features of the field B * .…”

Section: Discussionmentioning

confidence: 95%

“…The Lorentz force generated in the FCM or PFM process is applied to bulks as a tensile or compressive load. Because the compressive strength of superconducting bulks is much larger than the tensile strength, major cracking due to pinning-induced compressive stress has not been reported [27][28][29][30]. Before the large trapped magnetic fields are acquired, analysis of the tensile stress in bulks is very important in order to avoid serious damage to the samples when the bulks are excited by a magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Viscous flux flow velocity and stress distribution in the Kim model of a long rectangular slab superconductor

Yang

Chai

2018

Supercond. Sci. Technol.

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When a bulk superconductor endures the magnetization process, enormous mechanical stresses are imposed on the bulk, which often leads to cracking. In the present work, we aim to resolve the viscous flux flow velocity υ 0 /w, i.e. υ 0 (because w is a constant) and the stress distribution in a long rectangular slab superconductor for the decreasing external magnetic field (B a ) after zero-field cooling (ZFC) and field cooling (FC) using the Kim model and viscous flux flow equation simultaneously. The viscous flux flow velocity υ 0 /w and the magnetic field B * at which the body forces point away in all of the slab volumes during B a reduction, are determined by both B a and the decreasing rate (db a /dt) of the external magnetic field normalized by the full penetration field B p . In previous studies, υ 0 /w obtained by the Bean model with viscous flux flow is only determined by db a /dt, and the field B * that is derived only from the Kim model is a positive constant when the maximum external magnetic field is chosen. This means that the findings in this paper have more physical contents than the previous results. The field B * <0 can be kept for any value of B a when the rate db a /dt is greater than a certain value. There is an extreme value for any curve of maximum stress changing with decreasing field B a after ZFC if B * 0. The effect of db a /dt on the stress is significant in the cases of both ZFC and FC.

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Flux Pinning-Induced Stress in a Long Hollow Cylindrical Superconductor Restricted by a Metal Tube

Zhao

2018

J Supercond Nov Magn

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Kim model for flux-pinning-induced stress in a long cylindrical superconductor

Cited by 9 publications

References 33 publications

Stress analysis in high-temperature superconductors under pulsed field magnetization

Stress analysis in high-temperature superconductors under pulsed field magnetization

Viscous flux flow velocity and stress distribution in the Kim model of a long rectangular slab superconductor

Flux Pinning-Induced Stress in a Long Hollow Cylindrical Superconductor Restricted by a Metal Tube

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