Three-Directional FEM Analyses of Pre-Bending Effects for Composite Wires

Pre-bending effects of Nb 3 Sn composite wires, enhancement in J c at the as-cooled condition and J c peak, J cm , against applied tensile strain, are well known in especially Cu-Nb reinforced Cu stabilized Nb 3 Sn wire. In an attempt to understand the effects, three directional strain analyses usin...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2007-06, Vol.17 (2), p.2676-2679
Main Authors: Murase, S., Okada, I., Kiyama, K., Nanato, N., Kim, S.B., Oguro, H., Nishijima, G., Awaji, S., Watanabe, K., Wake, M.
Format: Article
Language:English
Subjects:
Capacitive sensors
Composite superconductor
FEM
Magnetic materials
Niobium
pre-bending
Superconducting filaments and wires
Superconducting magnets
Superconducting materials
Temperature
Tensile strain
Tensile stress
Thermal stresses
three-directional strain
{\rm Nb}_{3}{\rm Sn}
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Summary:Pre-bending effects of Nb 3 Sn composite wires, enhancement in J c at the as-cooled condition and J c peak, J cm , against applied tensile strain, are well known in especially Cu-Nb reinforced Cu stabilized Nb 3 Sn wire. In an attempt to understand the effects, three directional strain analyses using FEM were studied by considering thermally-induced residual strain due to temperature difference between the reaction temperature and the cryogenic temperatures including the pre-bending process at room temperature for three types of Nb 3 Sn composite wires. To evaluate effects of change in three directional strain, the von Mises strain was introduced. As a result, the minimum von Mises strain against the applied tensile strain corresponded to J cm ; low strain shows J cm enhancement by the pre-bending for Cu-Nb reinforced Nb 3 Sn wire. It was found that there is a direct correlation between the minimum von Mises strain and J cm related to the pre-bending.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2007.899597