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Prediction of variation in critical current with applied tensile/bending strain of Bi2223 composite tape from tensile stress-strain curve
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10.1063/1.3380828
/content/aip/journal/jap/107/8/10.1063/1.3380828
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/8/10.1063/1.3380828

Figures

Image of FIG. 1.
FIG. 1.

Micrographs of the transverse cross-section of (a) VAM1, (b) VAM2, and (c) VAM3 samples, in which the thickness direction is three times enlarged from the as-observed ones, and the schematic representation of the shape of the core of VAM1, VAM2, and VAM3, together with the definition of and .

Image of FIG. 2.
FIG. 2.

Schematic representation of the geometry of the cross-section and the relation of the damage front (, , and ) to bending strain (, , and ) in models (a) S and (b) R for VAM1 as an example.

Image of FIG. 3.
FIG. 3.

Measured tensile stress -strain curves of (a) VAM1, (b) VAM2, and (c) VAM3 samples at 77 K. The arrows show the stage of multiple fracture of the Bi2223 filaments. The stress-strain curve and the slope of the regions surrounded by the rectangles in (a), (b), and (c), where damages initiate and extend, are presented at high magnification in , , and , respectively. The refers to the damage strain parameter at initiation of damage of Bi2223 filaments.

Image of FIG. 4.
FIG. 4.

Measured changes of the normalized critical current with increasing applied tensile strain for (a) VAM1, (b) VAM2 and (c) VAM3 samples at 77 K. The relation in the rectangles in (a), (b), and (c) where damages initiate and extend, and the slope -strain relation in the corresponding strain range are presented at high magnification in , , and , respectively. The damage strain parameter at the damage initiation (0.37%, 0.40%, and 0.32% for VAM1, VAM2, and VAM3 samples, respectively) estimated from the relation refers to the predicted irreversible tensile strain for critical current. The dotted curve in shows the regression curve of the relation in the range of .

Image of FIG. 5.
FIG. 5.

Comparison of the calculated normalized critical current (measured at 77 K)-bending strain (bent at 77 K) curves of the VAM1 sample with the experimental result reported by Katagiri et al. (Ref. 23). (a) Calculated by Eq. (3) (model S) with the damage strain parameter values of , 0.40%, and 0.43%. (b) Calculated by Eq. (3) (model S) and Eq. (4) (model R) with . (c) Calculated by Eqs. (3) and (4) with .

Image of FIG. 6.
FIG. 6.

Measured tensile stress -strain curves of (a) VAM1, (b) VAM2, and (c) VAM3 samples at room temperature. The arrows show the stage of multiple fracture of the Bi2223 filaments. The stress-strain curve and the slope of the regions surrounded by the rectangles in (a), (b), and (c), where damages initiate and extend, are presented at high magnification in , , and , respectively.

Image of FIG. 7.
FIG. 7.

Comparison of the calculated relation of the normalized critical current to the bending stain (bent at room temperature) with the measured one for (a) VAM1, (b) VAM2, and (c) VAM3 samples. The open circle, upper bar, and lower bar at each applied bending strain show the average, the highest, and lowest -values of three test specimens. The solid and broken curves show the calculation result with the estimated value for each sample by models S and R, respectively.

Tables

Generic image for table
Table I.

Formulated shape (boundary) of the core in models S and R. The length unit is mm.

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/content/aip/journal/jap/107/8/10.1063/1.3380828
2010-04-21
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Prediction of variation in critical current with applied tensile/bending strain of Bi2223 composite tape from tensile stress-strain curve
http://aip.metastore.ingenta.com/content/aip/journal/jap/107/8/10.1063/1.3380828
10.1063/1.3380828
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