Flux-pinning-induced stress behaviors in a long superconducting slab with central cuboid hole

Liu, Qifang; Feng, Wenjie; Liu, Jiayu

doi:10.1007/s10409-021-01074-2

Cited by 9 publications

(4 citation statements)

References 34 publications

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“…The HTS is subjected to an electromagnetic force (or Lorentz force) under the action of an external moving magnetic field, causing the stress inside. According to the nature of superconducting materials, HTSs can be considered as the isotropic ceramic material [12,13]. Therefore, we used the linear small elasticity equation as the stress field governing equation (Navier equation), written as…”

Section: Thermal and Stress Modellingmentioning

confidence: 99%

“…where E Y = 200 GPa is the Young's modulus [28]. v P = 0.3 is the Poisson's ratio [13]. A sm and B sm are the 3 × 3 order submatrices of D m .…”

Section: Thermal and Stress Modellingmentioning

confidence: 99%

“…And they also discussed the crack initiation and propagation. Liu et al [13] developed a 3D mechanical FEM model for an infinitely long superconducting flat plate with a finite-length rectangular hole inside. They studied its stress concentration during the zero-field cooling and fieldcooled magnetization in a single-value external field.…”

Section: Introductionmentioning

confidence: 99%

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Effects of interior angle and inclination angle of slot defect on electromagnetic-stress behaviours of superconducting swing system

Zhao

Feng

et al. 2023

Supercond. Sci. Technol.

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Currently, copper-oxygen high-temperature superconducting materials have strongly anisotropic electromagnetic properties, which are difficult to describe in the equations. And in the rotating machine containing the permanent magnet (PM) rotor and bulk high-temperature superconductor (HTS) stator, when the HTSs have defects, their electromagnetic-stress behaviours may affect the mechanical stability of the equipment and even cause it to not work properly. In this paper, we proposed an anisotropic electromagnetic equation based on the H-formulation and established a three-dimensional coupled model with the magnetic, thermal and stress fields to study the electromagnetic-stress behaviours of a HTS with a slot defect during the swing of a PM, discussing the effects of the interior angle and inclination angle of the defect on the behaviours. The results show that the interior and inclination angles of the defect have a large influence on the electromagnetic-stress behaviours. For the electromagnetic characteristics, the main influence is on the rotational losses. Especially the losses at an inclination angle of 60° are 16.5 times those without damage. This is related to the "thin wall" structure near the upper surface of the HTS. The stress concentration point appears on the defect boundary. The novelty of this paper is the proposal of the anisotropic electromagnetic equations based on the H-formulation and the study of the electromagnetic-stress behaviours of a superconducting swing system containing a PM and HTS with a slot defect from a three-dimensional perspective. The research results of this paper can be the references for the design and structural protection of superconducting rotating machines.

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Section: Thermal and Stress Modellingmentioning

confidence: 99%

“…where E Y = 200 GPa is the Young's modulus [28]. v P = 0.3 is the Poisson's ratio [13]. A sm and B sm are the 3 × 3 order submatrices of D m .…”

Section: Thermal and Stress Modellingmentioning

confidence: 99%

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Effects of interior angle and inclination angle of slot defect on electromagnetic-stress behaviours of superconducting swing system

Zhao

Feng

et al. 2023

Supercond. Sci. Technol.

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“…Owing to the brittleness of superconductors, damage may occur under a huge Lorentz force and thermal stress during magnetization [51][52][53][54][55][56]. The mechanical stresses in bulk superconductors during magnetization or cooling have been studied by several researchers [57][58][59][60][61]. The magnetic-thermal characteristics and mechanical stress of an REBCO superconducting bulk material with an inhomogeneous critical current density during PFM were analyzed by Wu et al [62] and Hirano et al [63].…”

Section: Introductionmentioning

confidence: 99%

Flux jump and mechanical response in inhomogeneous high-temperature superconductor under the pulsed-field magnetization

Wang,

Wu,

Yong

2023

Supercond. Sci. Technol.

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The high-temperature bulk superconductors with high critical current density are brittle, and can be damaged by large Lorentz forces and thermal stress during magnetization. Several studies have reported the failure of bulk superconductors during flux jumps. In this study, we analyzed the magnetization characteristics and mechanical response of the HTS bulk with inhomogeneous current density along the c-axis. The numerical simulation was consistent with the experimental results presented in the reference. Moreover, a flux jump occurred near the area of the pre-arrangement flux during the second pulsed field magnetization. The maximum temperature is lower than the critical temperature during the flux jump. In the mechanical analysis, the flux jump led to an abrupt change in the maximum stress of the bulk, and the maximum radial stress was significantly higher than the maximum hoop stress during the flux jump. The maximum radial stress increased with decreasing ambient temperature during the flux jump, and the maximum stress area was always near the seeded plane. Subsequently, the magnetization characteristics and mechanical response were studied for different locations of the seeded surface, two concentric superconducting bulks, and non-uniform fields.

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Mechanical Response of Conductor on Round Core (CORC) Cables Under Electromagnetic Force

Liu

Zhang

et al. 2023

Acta Mech. Solida Sin.

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Flux-pinning-induced stress behaviors in a long superconducting slab with central cuboid hole

Cited by 9 publications

References 34 publications

Effects of interior angle and inclination angle of slot defect on electromagnetic-stress behaviours of superconducting swing system

Effects of interior angle and inclination angle of slot defect on electromagnetic-stress behaviours of superconducting swing system

Flux jump and mechanical response in inhomogeneous high-temperature superconductor under the pulsed-field magnetization

Mechanical Response of Conductor on Round Core (CORC) Cables Under Electromagnetic Force

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