Skip to main content

Research Repository

Advanced Search

Mechanism for the uniaxial strain dependence of the critical current in practical REBCO tapes

Osamura, K.; Machiya, S.; Hampshire, D.P.

Mechanism for the uniaxial strain dependence of the critical current in practical REBCO tapes Thumbnail


Authors

K. Osamura

S. Machiya



Abstract

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.

Citation

Osamura, K., Machiya, S., & Hampshire, D. (2016). Mechanism for the uniaxial strain dependence of the critical current in practical REBCO tapes. Superconductor Science and Technology, 29(6), Article 065019. https://doi.org/10.1088/0953-2048/29/6/065019

Journal Article Type Article
Acceptance Date Apr 15, 2016
Online Publication Date May 6, 2016
Publication Date Jun 1, 2016
Deposit Date Jul 6, 2016
Publicly Available Date May 6, 2017
Journal Superconductor Science and Technology
Print ISSN 0953-2048
Electronic ISSN 1361-6668
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 29
Issue 6
Article Number 065019
DOI https://doi.org/10.1088/0953-2048/29/6/065019

Files

Accepted Journal Article (852 Kb)
PDF

Copyright Statement
This is an author-created, un-copyedited version of an article published in Superconductor Science and Technology. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at 10.1088/0953-2048/29/6/065019







You might also like



Downloadable Citations