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Supporting data: Mechanism for the uniaxial strain dependence of the critical current in practical REBCO tapes Open Access

Abstract form paper: In order to elucidate the effect of uniaxial strain on the critical current of practical REBCO tapes (REBa2Cu3O7−d , RE = Y and Gd) fabricated by Superpower and SuNAM, two types of critical current measurements were carried out. In the first, the tape sample was attached directly to a universal testing machine and pulled under a tensile load. In the second, the tape was soldered to a Cu–Be springboard and then attached to the testing machine and then pushed or pulled in order to apply both tensile and compressive strains to the tape sample. An inverse parabolic behaviour was observed for the uniaxial strain dependence of the critical current of both tapes. Using synchrotron radiation, the local strain exerted on the REBCO layer was measured at room temperature under the conditions used for the two techniques for making I c measurements. On the basis of these room temperature data, the local strain exerted on the REBCO layer at 77 K was numerically evaluated. A one-dimensional chain model for current flow in the REBCO material with fractional lengths of A-domains and B-domains oriented along the uniaxial strain direction is proposed. The model can explain the parabolic strain behaviour of the critical current and shows that the strain at which the peak in I c occurs, is not only determined by pre-compression or pre-tension on the superconductor at the operating temperature, but also by the ratio of the fractional amounts of the two domains.

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Resource type

Dataset

Contributors

Creator: Osamura, Kozo ¹
Creator: Machiya, Shutaro ²
Creator: Hampshire, Damian ³
Contact person: Hampshire, Damian ³

¹ Research Institute for Applied Sciences, Kyoto 606-8202, Japan
² Daido University, Nagoya 457-8530, Japan
³ Durham University, UK

Funder

Engineering and Physical Sciences Research Council

Research methods

Other description

Keyword

critical current
REBCO coated conductor
uniaxial strain dependence
synchrotron radiation
thermal strain
chain model
twin structure

Subject

Location

Language

Cited in

doi:10.1088/0953-2048/29/6/065019
http://dro.dur.ac.uk/19427/

Identifier

ark:/32150/gh93gz499
doi:10.15128/gh93gz499

Rights

All rights reserved All rights reserved

Publisher

Durham University

Date Created

2015-08-07T00:00:00.000+00:00

File Details

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S. Palucha

Date Uploaded

12 October 2015, 14:10:10

Date Modified

24 March 2017, 15:03:38

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File format: zip (ZIP Format)

Mime type: application/zip

File size: 1575

Last modified: 2017:03:24 15:49:13+00:00

Filename: DataPoints-Figure8-2201605_Osamura_SuST_Mechanism.zip

Original checksum: 21667ea61c96e73f7a0bd05a8b6d0da3