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Title: Strain Distribution in REBCO-Coated Conductors Bent With the Constant-Perimeter Geometry

Abstract

Here, cable and magnet applications require bending REBa 2Cu 3O 7-δ (REBCO, RE = rare earth) tapes around a former to carry high current or generate specific magnetic fields. With a high aspect ratio, REBCO tapes favor the bending along their broad surfaces (easy way) than their thin edges (hard way). The easy-way bending forms can be effectively determined by the constant-perimeter method that was developed in the 1970s to fabricate accelerator magnets with flat thin conductors. The method, however, does not consider the strain distribution in the REBCO layer that can result from bending. Therefore, the REBCO layer can be overstrained and damaged even if it is bent in an easy way as determined by the constant-perimeter method. To address this issue, we developed a numerical approach to determine the strain in the REBCO layer using the local curvatures of the tape neutral plane. Two orthogonal strain components are determined: the axial component along the tape length and the transverse component along the tape width. These two components can be used to determine the conductor critical current after bending. The approach is demonstrated with four examples relevant for applications: a helical form for cables, forms for canted cos θmore » dipole and quadrupole magnets, and a form for the coil end design. The approach allows us to optimize the design of REBCO cables and magnets based on the constant-perimeter geometry and to reduce the strain-induced critical current degradation.« less

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1420132
Grant/Contract Number:
AC02-05CH11231
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
IEEE Transactions on Applied Superconductivity
Additional Journal Information:
Journal Volume: 27; Journal Issue: 8; Journal ID: ISSN 1051-8223
Publisher:
Institute of Electrical and Electronics Engineers (IEEE)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Bending strain; REBa2Cu3O7-δ; (REBCO RE = rare earth) coated conductors; rectifying developable surface

Citation Formats

Wang, Xiaorong, Arbelaez, Diego, Caspi, Shlomo, Prestemon, Soren O., Sabbi, GianLuca, and Shen, Tengming. Strain Distribution in REBCO-Coated Conductors Bent With the Constant-Perimeter Geometry. United States: N. p., 2017. Web. doi:10.1109/TASC.2017.2766132.
Wang, Xiaorong, Arbelaez, Diego, Caspi, Shlomo, Prestemon, Soren O., Sabbi, GianLuca, & Shen, Tengming. Strain Distribution in REBCO-Coated Conductors Bent With the Constant-Perimeter Geometry. United States. doi:10.1109/TASC.2017.2766132.
Wang, Xiaorong, Arbelaez, Diego, Caspi, Shlomo, Prestemon, Soren O., Sabbi, GianLuca, and Shen, Tengming. Tue . "Strain Distribution in REBCO-Coated Conductors Bent With the Constant-Perimeter Geometry". United States. doi:10.1109/TASC.2017.2766132.
@article{osti_1420132,
title = {Strain Distribution in REBCO-Coated Conductors Bent With the Constant-Perimeter Geometry},
author = {Wang, Xiaorong and Arbelaez, Diego and Caspi, Shlomo and Prestemon, Soren O. and Sabbi, GianLuca and Shen, Tengming},
abstractNote = {Here, cable and magnet applications require bending REBa2Cu3O7-δ (REBCO, RE = rare earth) tapes around a former to carry high current or generate specific magnetic fields. With a high aspect ratio, REBCO tapes favor the bending along their broad surfaces (easy way) than their thin edges (hard way). The easy-way bending forms can be effectively determined by the constant-perimeter method that was developed in the 1970s to fabricate accelerator magnets with flat thin conductors. The method, however, does not consider the strain distribution in the REBCO layer that can result from bending. Therefore, the REBCO layer can be overstrained and damaged even if it is bent in an easy way as determined by the constant-perimeter method. To address this issue, we developed a numerical approach to determine the strain in the REBCO layer using the local curvatures of the tape neutral plane. Two orthogonal strain components are determined: the axial component along the tape length and the transverse component along the tape width. These two components can be used to determine the conductor critical current after bending. The approach is demonstrated with four examples relevant for applications: a helical form for cables, forms for canted cos θ dipole and quadrupole magnets, and a form for the coil end design. The approach allows us to optimize the design of REBCO cables and magnets based on the constant-perimeter geometry and to reduce the strain-induced critical current degradation.},
doi = {10.1109/TASC.2017.2766132},
journal = {IEEE Transactions on Applied Superconductivity},
number = 8,
volume = 27,
place = {United States},
year = {Tue Oct 24 00:00:00 EDT 2017},
month = {Tue Oct 24 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on October 24, 2018
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