The effect of thermal cycling and axial strain on the IC degradation of multi-filamentary Bi-2223/Ag tapes

Ha, Hong-Soo; Choi, Ji-Ho; Yang, Jianwei; Kim, S.C.; Ha, Dong-Woo; Oh, Sang-Soo; Park, C.; Kwon, Yuri; Jang, Soo-Hyun; Joo, Jin Ho

doi:10.1016/j.physc.2004.02.211

Cited by 7 publications

(3 citation statements)

References 12 publications

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“…The irreversible degradation of the critical current of superconducting composite tape is mainly caused by the breakage of the superconducting filament under load or material deformation, which destroys the flow of current. [6,7] To describe the experimental phenomena of the critical current degradation dependence on the strain, some empirical formulae based on experimental observations were presented. [8−17] Related to the reversible degradation, Ekin's exponential model [12−14] was commonly accepted.…”

Section: Bi-basedmentioning

confidence: 99%

Critical-Current Degeneration Dependence on Axial Strain of Bi-based Superconducting Multi-filamentary Composite Tapes

Gao¹,

Wang²

2014

Chinese Phys. Lett.

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Superconducting materials are always severely restricted in practical engineering applications due to their carryingcurrent degradation under mechanical loads. Based on Ekin's exponential model and Weibull's distribution function, we propose an empirical degradation model for describing the mechanical deformation influence on the critical-current of Bi-based superconducting multi-filamentary composite tapes under axial loading. The critical currents of superconducting tapes depending on the axial strain are investigated analytically. It is shown that the predictions by the developed degradation model agree with the experimental data, in the processes of axial mechanical loading and unloading on the samples. The effect of the critical tension and compression damage strains on the normalized critical currents is also discussed.

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Section: Bi-basedmentioning

confidence: 99%

Critical-Current Degeneration Dependence on Axial Strain of Bi-based Superconducting Multi-filamentary Composite Tapes

Gao¹,

Wang²

2014

Chinese Phys. Lett.

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“…In practical applications, Bi-2223/ Ag multi-filamentary HTS tapes are unavoidably subjected to mechanical deformations during the fabrication/winding processes and electromagnetic field operation. Although the mechanical properties of Bi-2223/Ag HTS tapes have been remarkably enhanced by assembling with Ag matrix and Ag alloy sheath [7], the Bi-2223 superconducting filaments are easily damaged under different deformation modes due to their brittle nature [8][9][10][11]. As the most common and basic deformation modes, uniaxial, bending and torsional deformations have significant influences on the superconducting properties.…”

Section: Introductionmentioning

confidence: 99%

“…There was almost no change in AC loss when the deformation was less than the irreversible critical value, while AC loss increased sharply once the deformation was larger than the irreversible critical value [14][15][16][17][18][19][20][21]. The deformation-induced damage of superconducting filaments in Bi-2223/Ag multifilamentary HTS tapes was observed experimentally through scanning electron microscopy (SEM) [8][9][10][11]. The micrographs showed that damage of superconducting filaments was not detected for the case of small deformation; while transverse cracks were clearly observed as the strains exceeded an irreversible value [10].…”

Section: Introductionmentioning

confidence: 99%

Strain dependence of critical current and self-field AC loss in Bi-2223/Ag multi-filamentary HTS tapes: a general predictive model

Gao

Wang

Zhou

2019

Supercond. Sci. Technol.

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It is well known that mechanical deformations have a strong impact on the critical current (I c ) of Bi-2223/Ag multi-filamentary high-temperature superconducting (HTS) tapes, and a remarkable I c degradation is induced, which results in a significant AC loss. In this paper, a general predictive model based on the strain dependence of the Weibull distribution function of statistical damage of superconducting filaments and the Norris formula is developed to explore the influence of the uniaxial, bending and torsional deformation on I c degradation and self-field AC loss of Bi-2223/Ag HTS composite tapes. A unified strain dependence of the I c formula is suggested, which is extended in view of the I c degradation mechanism of Bi-2223/Ag HTS tapes under a uniaxial deformation with an introduction of longitudinal strain to unify the strain in uniaxial, bending and torsional deformation modes. Then, a modified Norris formula is deduced in light of the unified strain dependence of the I c model to predict AC loss of Bi-2223/Ag HTS tapes. With a set of appropriate model parameters determined by the tested data of I c under uniaxial deformation, the presented model can well predict both I c degradation and AC loss behaviors under not only a uniaxial deformation mode, but the bending and torsional ones. The proposed model indicates that the significant increase of AC loss for a deformed tape is presented due to the notable degradation of I .

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Analysis of torsional deformation-induced degeneration of critical current of Bi-2223 HTS composite tapes

Gao

Wang

2018

International Journal of Mechanical Sciences

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The effect of thermal cycling and axial strain on the IC degradation of multi-filamentary Bi-2223/Ag tapes

Cited by 7 publications

References 12 publications

Critical-Current Degeneration Dependence on Axial Strain of Bi-based Superconducting Multi-filamentary Composite Tapes

Critical-Current Degeneration Dependence on Axial Strain of Bi-based Superconducting Multi-filamentary Composite Tapes

Strain dependence of critical current and self-field AC loss in Bi-2223/Ag multi-filamentary HTS tapes: a general predictive model

Analysis of torsional deformation-induced degeneration of critical current of Bi-2223 HTS composite tapes

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