TY - JOUR
T1 - Analysis of bending effects on performance degradation of ITER-relevant Nb3Sn strand using the THELMA code
AU - Zanino, R.
AU - Boso, D. P.
AU - Lefik, M.
AU - Ribani, P. L.
AU - Richard, L. Savoldi
AU - Schrefler, B. A.
N1 - Funding Information:
Manuscript received August 29, 2007. This work was supported in part by the Italian Ministry for University and Research (MUR). R. Zanino and L. S. Richard are with Dipartimento di Energetica, Politecnico, I-10129 Torino Italy (e-mail: roberto.zanino@polito.it). D. P. Boso and B. A. Schrefler are with Universita’ di Padova, Italy. M. Lefik is with Technical University of Lódz, Poland. P. L. Ribani is with Universita’ di Bologna, Italy. Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TASC.2008.921336
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2008/6
Y1 - 2008/6
N2 - The modeling of the effects of bending on single Nb3Sn strand DC performance (IC, n index) is presented for a bronze-route strand subjected to the same loading conditions as in an experiment performed at JAEA Naka, Japan [Y. Nunoya, et al., IEEE TAS 14 (2004) 1468-1472]. The strand is discretized in strand elements (SE) representing groups of twisted filaments in the bronze matrix, and in portions of the outer Cu annulus, electro-magnetically coupled in the THELMA code. The 3-D strain map in the filament region is computed with a newly developed, detailed thermo-mechanical model accounting for non-linear, temperature dependent material characteristics. With respect to our previous analysis [P.L.Ribani, et al., IEEE TAS 16 (2006) 860-863] several new updated ingredients, besides the new thermo-mechanical model, are used here, including more accurate thermal and mechanical properties for the materials, a jacket-like model for the outer Cu layer, IC and n index (interpolative) scaling from Durham University. The simulation results show an improved agreement with the experiments, in the degradation of the single-strand performance due to bending.
AB - The modeling of the effects of bending on single Nb3Sn strand DC performance (IC, n index) is presented for a bronze-route strand subjected to the same loading conditions as in an experiment performed at JAEA Naka, Japan [Y. Nunoya, et al., IEEE TAS 14 (2004) 1468-1472]. The strand is discretized in strand elements (SE) representing groups of twisted filaments in the bronze matrix, and in portions of the outer Cu annulus, electro-magnetically coupled in the THELMA code. The 3-D strain map in the filament region is computed with a newly developed, detailed thermo-mechanical model accounting for non-linear, temperature dependent material characteristics. With respect to our previous analysis [P.L.Ribani, et al., IEEE TAS 16 (2006) 860-863] several new updated ingredients, besides the new thermo-mechanical model, are used here, including more accurate thermal and mechanical properties for the materials, a jacket-like model for the outer Cu layer, IC and n index (interpolative) scaling from Durham University. The simulation results show an improved agreement with the experiments, in the degradation of the single-strand performance due to bending.
KW - Fusion reactors
KW - ITER
KW - Modeling
KW - Superconducting filaments and wires
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U2 - 10.1109/TASC.2008.921336
DO - 10.1109/TASC.2008.921336
M3 - Article
AN - SCOPUS:45149087726
VL - 18
SP - 1067
EP - 1071
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 2
M1 - 4523031
ER -