Multiscale analysis of the influence of the triplet helicoidal geometry on the strain state of a Nb3Sn based strand for ITER coils

D. P. Boso; M. Lefik; B. A. Schrefler

doi:10.1016/j.cryogenics.2005.06.002

Multiscale analysis of the influence of the triplet helicoidal geometry on the strain state of a Nb₃Sn based strand for ITER coils

D. P. Boso, M. Lefik, B. A. Schrefler

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

A theoretical model of a beam of unidirectional composites-based on the homogenisation theory and a refined kinematical hypothesis-is used for the analysis of the influence of the helicoidal geometry of a superconducting strand triplet on its strain state. The triplet is the first cabling stage of the superconducting cables used to wind the coils of ITER fusion reactor. The multiscale modelling strategy is presented, for which a finite element code has been developed. A triplet of Nb₃Sn based strands subjected to an axial stretch is analysed, and the resulting complete 3D strain state in the Nb₃Sn filament is recovered. An "extra" strain is found due to the helicoidal geometry of the triplet. Discussion of the results concludes the paper.

Original language	English (US)
Pages (from-to)	589-605
Number of pages	17
Journal	Cryogenics
Volume	45
Issue number	9
DOIs	https://doi.org/10.1016/j.cryogenics.2005.06.002
State	Published - Sep 2005

Keywords

Beam theory
Composite materials
Filament strain
Finite element method
Multilevel homogenisation
NbSn based strand
Superconducting cable

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1016/j.cryogenics.2005.06.002

Cite this

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title = "Multiscale analysis of the influence of the triplet helicoidal geometry on the strain state of a Nb3Sn based strand for ITER coils",

abstract = "A theoretical model of a beam of unidirectional composites-based on the homogenisation theory and a refined kinematical hypothesis-is used for the analysis of the influence of the helicoidal geometry of a superconducting strand triplet on its strain state. The triplet is the first cabling stage of the superconducting cables used to wind the coils of ITER fusion reactor. The multiscale modelling strategy is presented, for which a finite element code has been developed. A triplet of Nb3Sn based strands subjected to an axial stretch is analysed, and the resulting complete 3D strain state in the Nb3Sn filament is recovered. An {"}extra{"} strain is found due to the helicoidal geometry of the triplet. Discussion of the results concludes the paper.",

keywords = "Beam theory, Composite materials, Filament strain, Finite element method, Multilevel homogenisation, NbSn based strand, Superconducting cable",

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T1 - Multiscale analysis of the influence of the triplet helicoidal geometry on the strain state of a Nb3Sn based strand for ITER coils

AU - Boso, D. P.

AU - Lefik, M.

AU - Schrefler, B. A.

PY - 2005/9

Y1 - 2005/9

N2 - A theoretical model of a beam of unidirectional composites-based on the homogenisation theory and a refined kinematical hypothesis-is used for the analysis of the influence of the helicoidal geometry of a superconducting strand triplet on its strain state. The triplet is the first cabling stage of the superconducting cables used to wind the coils of ITER fusion reactor. The multiscale modelling strategy is presented, for which a finite element code has been developed. A triplet of Nb3Sn based strands subjected to an axial stretch is analysed, and the resulting complete 3D strain state in the Nb3Sn filament is recovered. An "extra" strain is found due to the helicoidal geometry of the triplet. Discussion of the results concludes the paper.

AB - A theoretical model of a beam of unidirectional composites-based on the homogenisation theory and a refined kinematical hypothesis-is used for the analysis of the influence of the helicoidal geometry of a superconducting strand triplet on its strain state. The triplet is the first cabling stage of the superconducting cables used to wind the coils of ITER fusion reactor. The multiscale modelling strategy is presented, for which a finite element code has been developed. A triplet of Nb3Sn based strands subjected to an axial stretch is analysed, and the resulting complete 3D strain state in the Nb3Sn filament is recovered. An "extra" strain is found due to the helicoidal geometry of the triplet. Discussion of the results concludes the paper.

KW - Beam theory

KW - Composite materials

KW - Filament strain

KW - Finite element method

KW - Multilevel homogenisation

KW - NbSn based strand

KW - Superconducting cable

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