Crack problem for an inhomogeneous orthotropic superconducting slab under an electromagnetic force

Feng, Wenjie; Zhang, R.; Ding, He

doi:10.1016/j.physc.2012.02.027

Cited by 15 publications

(5 citation statements)

References 16 publications

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“…Johansen investigated the flux-pinning-induced stress, strain and magnetostriction of type-II superconductors systematically [31][32][33][34]. 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].…”

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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“…Critical current I c (estimated by application of the electrical field criterion E c = 1 µV/cm to the voltage V—current I curve) and n -value (estimated as the index n of the approximated I ∝ I n curve in the electrical field range of E = 0.1~10 µV/cm) are reduced under high electromagnetic and mechanic stresses, as have been reported for the superconducting oxide (such as RE(Y, Sm, Dy, Gd,···)Ba 2 Cu 3 O 7-δ : REBCCO) layer-coated tape [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ], and Bi2223 [ 15 , 16 , 17 , 18 , 19 , 20 ]-, MgB 2 [ 21 , 22 , 23 , 24 , 25 ]- and Nb 3 Sn [ 26 , 27 , 28 , 29 , 30 , 31 ]-filamentary types. In this work, we conduct a fundamental study on the influences of cracks in superconducting layer-coated tape on I c .…”

Section: Introductionmentioning

confidence: 66%

“…Usually, the cracking takes place non-uniformly, and hence, the I c / n -values vary by specimen [ 3 , 7 , 13 , 18 ] and along the length of the specimen [ 7 , 13 , 14 ]. Not limited to the stress-induced cracks, the non-uniformly distributed defects introduced during the fabrication process also cause a reduction in I c and n -values [ 11 , 13 ]. For safety design, it is required to reveal the relation of non-uniformly distributed defects/cracks to superconducting property [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Critical Current Dependence on Specimen Length and Crack Size Distribution in Cracked Superconductor

Ochiai,

Okuda

2023

Materials

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In order to describe the dependence of critical current on specimen length and crack size distribution in the superconducting tape with cracks of different sizes, a Monte Carlo simulation and a model analysis were carried out, employing the model specimens of various lengths constituted of multiple short sections with a crack per each. The model analysis was carried out to evaluate the effects of the two factors on the critical current of a specimen. Factor 1 is the size of the largest crack in a specimen, and Factor 2 is the difference in crack size among all sections at the critical voltage of critical current. Factors 1 and 2 were monitored by the smallest ligament parameter among all sections constituting the specimen and by the number of sections equivalent to the section containing the largest crack at the critical voltage of the critical current of the specimen, respectively. The research using the monitoring method revealed quantitatively that the critical current-reducing effect with increasing specimen length is caused by the increase in the size of the largest crack (Factor 1), and also, the critical current-raising effect is caused by the increase in the difference of crack size (Factor 2). As the effect of Factor 1 is larger than that of Factor 2, the critical current decreases with increasing specimen length. With the present approach, the critical current reducing and raising effects under various crack size distributions were evaluated quantitatively as a function of specimen length, and the specimen length-dependence of critical current obtained by the Monte Carlo simulation was described well.

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“…Therefore, the fracture analysis of nonhomogeneous HTS is a key issue in superconductor crack problems. Feng et al have studied the crack problem for a functionally graded thin superconducting film [19][20][21].…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

Fracture problem of a nonhomogeneous high temperature superconductor slab based on real fundamental solutions

Gao

Zheng

2015

Physica C: Superconductivity and its Applications

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Crack problem for an inhomogeneous orthotropic superconducting slab under an electromagnetic force

Cited by 15 publications

References 16 publications

Stress analysis in high-temperature superconductors under pulsed field magnetization

Stress analysis in high-temperature superconductors under pulsed field magnetization

Analysis of Critical Current Dependence on Specimen Length and Crack Size Distribution in Cracked Superconductor

Fracture problem of a nonhomogeneous high temperature superconductor slab based on real fundamental solutions

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