Degradation of critical current in Bi2212 composite wire under compression load

doi:10.1007/s10483-017-2286-8

Abstract

Abstract: Since Bi₂Sr₂Ca₁Cu₂O_8+x(Bi2212) wires are subject to mechanical loadings, degradation of critical current will occur. The effect of compressive loadings on the critical current of Bi2212 wire is studied by considering micro-buckling of filament. A Bi2212 wire is regarded as a unidirectional filament-reinforced composite in the theoretical analysis. By considering the influence of inclusion, the micro-buckling wavelength can be derived by using a two-dimensional model. Based on the experimental results, the critical current is fitted as a function of buckling wavelength. It is found that the decrease of the critical current is directly proportional to the reciprocal of square of the buckling wavelength. Change of micro-buckling wavelength with material parameters is discussed. A critical strain in the wire with a filament bridge is analyzed using the finite element method.

Key words: mode Ⅲcrack, near crack line analysis, elastic-plastic, antiplane, point forces, critical current, micro-buckling, Bi₂Sr₂Ca₁Cu₂O_8+x(Bi2212) wire, wavelength

2010 MSC Number:

74B10

Zhiyang WANG, Huadong YONG, Youhe ZHOU. Degradation of critical current in Bi2212 composite wire under compression load. Applied Mathematics and Mechanics (English Edition), 2017, 38(12): 1773-1784.

TrendMD

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