Journal ArticleDOI
Effect of stress on the critical current of Nb3Sn multifilamentary composite wire
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TLDR
In this article, a critical current study of flexible Nb3Sn multifilamentary composite wires has been conducted at 4 K in magnetic fields to 90 kOe (7.2×106 A/m) while the wire is subjected to high mechanical stresses.Abstract:
A critical‐current study of flexible Nb3Sn multifilamentary composite wires has been conducted at 4 K in magnetic fields to 90 kOe (7.2×106 A/m) while the wire is subjected to high mechanical stresses. The results show that at stresses above 1–2×108 Pa (strains of 0.1–0.2%) the critical current is significantly degraded, with the magnitude of the reduction dependent on reinforcement techniques used in the wire’s construction. The effect increases with magnetic field and results in the introduction of significant resistance at current levels well below the zero‐stress critical current. Design considerations for the use of Nb3Sn wires in the high‐stress environments of large‐scale superconducting magnets are discussed.read more
Citations
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Journal ArticleDOI
Strain scaling law for flux pinning in practical superconductors. Part 1: Basic relationship and application to Nb3Sn conductors
TL;DR: In this article, the authors present the basic uniaxial-strain scaling relationship and focus on its application to Nb3Sn conductors, and propose a general scaling relation which unifies the usual temperature scaling relation with this strain-scaling relation.
Journal ArticleDOI
The scaling law for the strain dependence of the critical current density in Nb3Sn superconducting wires
TL;DR: In this article, the critical current density (JC) of internal-tin and bronze-route Nb3Sn superconducting wires as a function of magnetic field (B?23?T), temperature (4.2?K?T?12?K) and axial strain (?1.6%??I?0.40%).
Book ChapterDOI
Strain Effects in Superconducting Compounds
TL;DR: In this article, Ekin, Fickett, and Clark measured the reversible nonhydrostatic strain effect in a commercial multifilamentary NbTi conductor and found that the interaction could not be explained simply by filament breakage, heating, or cross-sectional area reduction, but appeared to be intrinsic to the superconducting material itself.
Journal ArticleDOI
Strain dependence of the critical current and critical field in multifilamentary Nb 3 Sn composites
TL;DR: In this article, the performance of high-J c multifilamentary Nb 3 Sn superconductors with widely varying amounts of prestrain and critical field values can be characterized fairly accurately by a single normalized critical field-strain relationship.
Journal ArticleDOI
A review of mechanical behaviour and stress effects in hard superconductors
C.C. Koch,D.S. Easton +1 more
TL;DR: The mechanical properties of type II superconducting materials are reviewed as well as the effect of stress on the superconding properties of these materials as discussed by the authors, and the importance of mechanical behaviour on device performance is discussed.
References
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Journal ArticleDOI
Effect of Tensile Stress on the Transition Temperature and Current‐Carrying Capacity of Nb3Sn
E. Buehler,H. J. Levinstein +1 more
TL;DR: In this article, the effect of tensile tensile stress on the superconducting properties of a Nb3Sn-cored wire has been measured, and the critical temperatures based on the midpoint of the resistance-temperature curves, decrease with increasing applied stress for a niobium-sheathed wire.
Journal ArticleDOI
The mechanical properties of filamentary niobium tin composites
TL;DR: In this paper, the failure mechanism of Nb 3 Sn layers is discussed in terms of the fracture mechanics of composite materials and the effect of reaction conditions and variation of component dimensions on the strain which can be accommodated before loss of current carrying capacity occurs has been determined, critical strains to failure lie within the range 1-3%.
Journal ArticleDOI
Superconducting Machines and Devices: Large Systems Applications
TL;DR: In this article, the authors present a large scale application of superconducting materials in large scale applications in the United Kingdom and the United States of America, including the use of hydrogen as an energy carrier.