Bending strain effect on critical current of Bi-2223 superconductor tapes—report of international round-robin-test

Kuroda, T.; Itoh, K.; Katagiri, K.; Goldacker, W.; Haessler, W.; Haken, Bennie ten; Kiuchi, M.; Noto, Kōshichi; Ochiai, Shojiro; Otabe, Edmund Soji; Shin, Hwa Sung; Sosnowski, J.; Weijers, H.W.; Wada, Hitoshi; Kumakura, K.

doi:10.1016/j.physc.2005.06.018

Cited by 38 publications

(46 citation statements)

References 10 publications

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“…The measurement of critical current of bent samples was carried out with the procedure employed in the round robin test of VAMAS (Versailles project on advanced materials and standard)/ TWA 16 (Technical working area 16, superconducting materials) [15]. Bending strain was given at room temperature by pressing the sample with the upper GFRP die to the lower one with the same curvature.…”

Section: Critical Current Measurement Of Bent Samplesmentioning

confidence: 99%

Prediction of critical current–bending strain relation of Bi2223 composite tape using residual strain of filaments, load–strain curve and geometry of cross-section

Ochiai

Okuda

Matsubayashi

et al. 2009

Physica C: Superconductivity

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a b s t r a c tA prediction method of the critical current-bending strain relation of the Bi2223 composite tape, which was bent at room temperature and cooled down to 77 K for measurement of critical current, was presented. The present method consisted of (a) measurement of residual strain of Bi2223 filaments at room temperature in the sample length direction by the X-ray diffraction method, (b) estimation of tensile fracture strain of the filaments from the analysis of the load-strain curve at room temperature, (c) measurement of geometrical factors such as the thickness of the sample and shape of the core by observation of the cross-section with optical microscope, and (d) calculation of the critical current as a function of bending strain by using the measured parameters mentioned in (a)-(c). The predicted variation of critical current with bending strain by the present approach described well the experimental one.

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Section: Critical Current Measurement Of Bent Samplesmentioning

confidence: 99%

Prediction of critical current–bending strain relation of Bi2223 composite tape using residual strain of filaments, load–strain curve and geometry of cross-section

Ochiai

Okuda

Matsubayashi

et al. 2009

Physica C: Superconductivity

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“…The mechanical properties are among the most important parameters for HTS tapes [1][2][3]. The relation of deformation and fracture behavior of multi-filamentary Bi2223/Ag composite tapes to the superconducting property has been studied widely [4][5][6][7][8][9]. It was revealed that the critical-current in the superconducting composite tapes under bending deformation decreases seriously beyond an irreversible strain, and once the applied strain exceeds such the irreversible strain, the critical-current never returns to the original value even when the applied strain is released [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Theory analysis of critical-current degeneration in bended superconducting tapes of multifilament composite Bi2223/Ag

Gao

Wang

2015

Physica C: Superconductivity and its Applications

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14] Heterogeneous damage occurs, and the damage evolution behavior differs from specimen to specimen and from location to location within a specimen. [9][10][11][12][13][14] Accordingly, when a number of specimens are tested, the critical current differs from specimen to specimen.…”

Section: Introductionmentioning

confidence: 99%

“…The procedure for application and the features of this approach (hereinafter ''damage approach'') is presented later in Section 3.2. This approach was applied to the measured values of the VAM1 sample in the round robin test 10) of VAMAS (Versailles project on advanced materials and standard)/TWA 16 (Technical working area 16, superconducting materials). It was shown that the measured distribution of the critical current values is described well by this approach.…”

Section: Introductionmentioning

confidence: 99%

“…The reason why the distribution of I c =I c0 values of the bent-damaged specimens is described by the Weibull distribution function is discussed in 4.3, considering the formulation of the distribution function derived from the damage approach. Figure 1 shows the variation of (a) the normalized critical current I c =I c0 and (b) COV (coefficient of variation) of I c =I c0 values with increasing bending strain " B for 33 specimens, measured for VAM1 sample in the round robin test 10) of VAMAS/TWA 16. The test specimens had width (W) of 3.70 mm and thickness (t) of 0.270 mm on average.…”

Section: Introductionmentioning

confidence: 99%

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Applicability of Weibull Distribution to Description of Distributed Normalized Critical Current of Bent-Damaged Bi2223 Composite Tape

et al. 2010

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Critical current of bent-damaged Bi2223 composite tape differs from specimen to specimen. To describe the distributed critical current values of specimens, the three-parameter Weibull distribution function has been employed and has been demonstrated to describe the experimental results. In the present work, the reason for this was discussed by modeling analysis of the experimental results in a round robin test of VAMAS/TWA16. The distribution of the measured normalized critical current values was described well by using the damage evolution approach, in which the difference in damage evolution among the specimens was correlated to the distribution of critical current values. From this approach, the three-parameter Weibull distribution function for critical current values was derived, which gave almost the same parameter values for the minimum critical current, scale parameter and shape parameter as those obtained by the direct application of the Weibull distribution function to the experimental results. Based on this result, the reason why the normalized critical current values of bent-damaged composite tape is described by the three-parameter Weibull distribution function was accounted for in a quantitative manner by the difference in damage evolution among the specimens.

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Bending strain effect on critical current of Bi-2223 superconductor tapes—report of international round-robin-test

Cited by 38 publications

References 10 publications

Prediction of critical current–bending strain relation of Bi2223 composite tape using residual strain of filaments, load–strain curve and geometry of cross-section

Prediction of critical current–bending strain relation of Bi2223 composite tape using residual strain of filaments, load–strain curve and geometry of cross-section

Theory analysis of critical-current degeneration in bended superconducting tapes of multifilament composite Bi2223/Ag

Applicability of Weibull Distribution to Description of Distributed Normalized Critical Current of Bent-Damaged Bi2223 Composite Tape

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