FEM analysis of three directional strain states under applied tensile stress for various composite superconductors

S. Murase, Hideki Okamoto

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Composite superconductors such as Cu/Nb3Sn and Ag/Bi-oxides are subjected to thermally-induced residual strain by other component materials due to the around 1,000 K temperature difference between the reaction temperature and the cryogenic temperatures, and to applied tensile strain by the hoop stress of longitudinal (z) direction during the coil operation. To clarify especially the radial (r) and tangential (θ) strain behaviors including z-strain, we analyzed elastic-plastically multi-core model by computing of FEM for various composite conductors. As a result, applied tensile stress on the z-direction of the composite conductor gave monotonous decrease of thermally-induced r- and θ-strains, which changed tensile to compressive strain. With increase in the z-strain effective strain showed the minimum value, not zero, at around z -strain-free state. Moreover it was found that all conductors are classified into three types by combination of component materials.

Original languageEnglish
Pages (from-to)1130-1133
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume14
Issue number2
DOIs
Publication statusPublished - Jun 2004

Fingerprint

tensile stress
Tensile stress
Superconducting materials
conductors
Finite element method
composite materials
Composite materials
hoops
cryogenic temperature
temperature gradients
coils
oxides
Tensile strain
Cryogenics
Temperature
Oxides
temperature

Keywords

  • Bi2212
  • Composite superconductor
  • FEM
  • Nb Al
  • NbSn
  • Tensile strain
  • Thermal expansion coefficient

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

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abstract = "Composite superconductors such as Cu/Nb3Sn and Ag/Bi-oxides are subjected to thermally-induced residual strain by other component materials due to the around 1,000 K temperature difference between the reaction temperature and the cryogenic temperatures, and to applied tensile strain by the hoop stress of longitudinal (z) direction during the coil operation. To clarify especially the radial (r) and tangential (θ) strain behaviors including z-strain, we analyzed elastic-plastically multi-core model by computing of FEM for various composite conductors. As a result, applied tensile stress on the z-direction of the composite conductor gave monotonous decrease of thermally-induced r- and θ-strains, which changed tensile to compressive strain. With increase in the z-strain effective strain showed the minimum value, not zero, at around z -strain-free state. Moreover it was found that all conductors are classified into three types by combination of component materials.",
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AU - Okamoto, Hideki

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AB - Composite superconductors such as Cu/Nb3Sn and Ag/Bi-oxides are subjected to thermally-induced residual strain by other component materials due to the around 1,000 K temperature difference between the reaction temperature and the cryogenic temperatures, and to applied tensile strain by the hoop stress of longitudinal (z) direction during the coil operation. To clarify especially the radial (r) and tangential (θ) strain behaviors including z-strain, we analyzed elastic-plastically multi-core model by computing of FEM for various composite conductors. As a result, applied tensile stress on the z-direction of the composite conductor gave monotonous decrease of thermally-induced r- and θ-strains, which changed tensile to compressive strain. With increase in the z-strain effective strain showed the minimum value, not zero, at around z -strain-free state. Moreover it was found that all conductors are classified into three types by combination of component materials.

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