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Nonuniform Current Distributions in YBa2Cu3O7−x Coated Conductor Caused by Fatigue Damage with Digital Speckle Correlation Analysis

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Abstract

Digital speckle correlation method (DSCM) is used to investigate fatigue evolution in the YBa2Cu3O7−x coated conductors (YBCO CCs) at room temperature. Damage analysis based on the DSCM has been performed to detect the damaged areas on the experimental samples. Two important parameters including stiffness variation (E) and dissipated energy per cycle (H) have been calculated for every fatigue test. Moreover, the superconducting specimens are subdivided into five sections with a distance of 1 cm between each of them, and the local critical currents (77 K and self-field) of fatigue and fatigue free are measured. The nonuniform current distributions are observed and can be interpreted qualitatively.

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Acknowledgments

This work is supported by the National Key Project ofMagneto-Constrained Fusion Energy Development Program (No. 2013GB110001, 2013GB110002). This work is also supported by the Fund of Natural Science Foundation of China (No. 11102077, 11372121, 11032006, 11121202, 11202089), the Foundation for the Author of National Excellent Doctoral Dissertation of PR China (No. 201135), the Program for New Central Excellent Talents in University (NCET-12-0245) and the Fundamental Research Funds for the Central Universities (lzujbky-2013-k01, lzujbky-2014-k10).

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Authors and Affiliations

  1. Key Laboratory of Mechanics on Disaster and Environment in Western China attached to the Ministry of Education of China, Lanzhou University, 730000, Lanzhou, Gansu, People’s Republic of China

    Jun Wang, Xingyi Zhang, Jun Zhou & Youhe Zhou

  2. Department of Mechanics and Engineering Sciences, College of Civil Engineering and Mechanics, Lanzhou University, 730000, Lanzhou, Gansu, People’s Republic of China

    Jun Wang, Xingyi Zhang, Jun Zhou & Youhe Zhou

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  1. Jun Wang
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  2. Xingyi Zhang
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Correspondence to Xingyi Zhang.

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Wang, J., Zhang, X., Zhou, J. et al. Nonuniform Current Distributions in YBa2Cu3O7−x Coated Conductor Caused by Fatigue Damage with Digital Speckle Correlation Analysis. J Supercond Nov Magn 27, 2283–2288 (2014). https://doi.org/10.1007/s10948-014-2614-0

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  • DOI: https://doi.org/10.1007/s10948-014-2614-0

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