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Influences of cracking of coated superconducting layer on voltage-current curve, critical current, and -value in DyBCO-coated conductor pulled in tension
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10.1063/1.3488014
/content/aip/journal/jap/108/6/10.1063/1.3488014
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/6/10.1063/1.3488014
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

An example of the arrayed multiple cracking of the DyBCO layer, observed in the copper-plated sample used in the present work. The appearance of the cracked DyBCO layer was observed by etching away the copper and silver layers after application of tensile strain on the sample.

Image of FIG. 2.
FIG. 2.

Experimental results. (a) Change in critical current and -value with increasing applied tensile strain . (b) Plot of -value against .

Image of FIG. 3.
FIG. 3.

Change in (a) critical current and (b) -value with increasing applied tensile strain in low tensile strain range.

Image of FIG. 4.
FIG. 4.

Representative examples of the curves in (a) normal and (b) logarithmic scale. Open circles show the experimental results. Solid curves show the calculation results with the procedure shown in Sec. IV.

Image of FIG. 5.
FIG. 5.

Schematic representation of (a) current path, (b) electrical circuit and (c) simplified electrical circuit under an existent crack. In (c), the total resistance in the shunting circuit shown in (b) is replaced by .

Image of FIG. 6.
FIG. 6.

Obtained values of (a) ratio of noncracked area and (b) resistance in the shunting circuit, plotted against applied tensile strain .

Image of FIG. 7.
FIG. 7.

Comparison of the experimental results with the calculation results by Eqs. (5) and (6) with the obtained and values. (a) Change in critical current with applied tensile strain . (b) Change in -value with . (c) Correlation between -value to .

Image of FIG. 8.
FIG. 8.

(a) An example of measured and analyzed curve and variation in shunting current with overall current . The portion (b) indicated in (a) is presented at high magnification in (b). (c) Ratio of at to critical current and , showing that most of the current (more than 95%) is transferred by DyBCO layer at in the wide range of values (20–195 A).

Image of FIG. 9.
FIG. 9.

(a) Examples of variation in overall voltage and voltage at cracked region with current , from which the ratio at , is read. (b) Variation in with critical current , showing that the voltage stems from the cracked region in the wide range of values (20–180 A).

Image of FIG. 10.
FIG. 10.

Critical current values plotted against the ratio of noncracked area .

Image of FIG. 11.
FIG. 11.

(a) Modified ratio of noncracked area plotted against tensile strain .(b) Critical current values plotted against the modified ratio of noncracked area .

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/content/aip/journal/jap/108/6/10.1063/1.3488014
2010-09-17
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Influences of cracking of coated superconducting layer on voltage-current curve, critical current, and n-value in DyBCO-coated conductor pulled in tension
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/6/10.1063/1.3488014
10.1063/1.3488014
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