V-2: Effects of stress/strain

Katagiri, K.; Okada, T.; Walters, C.R.; Ekin, John W.

doi:10.1016/0011-2275(95)99832-s

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…For each field, J, peaks at a certain value of strain E,, which is attributed to compressive prestress exerted by the bronze matrix on the Nb3Sn filaments as the sample is cooled down after the heat treatment. The value of e,nrax (= 0.257%) is in good agreement with that reported for 4.2 K in the VAMAS programme report [9]. Fig.…”

Section: A Critical Current Densitysupporting

confidence: 85%

Variable-temperature transport critical currents of niobium-tin wires under strain in high magnetic fields

Cheggour

Hampshire

1999

IEEE Trans. Appl. Supercond.

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Abstrad-A new probe has been developed to investigate the effect of strain and temperatme on the transport critical current density of superconducting wires and tapes in high magnetic fields. The critical current of a mdtifilamentary niobium-tin wht has been measured as a function of magnetic field at 12 K, for both compressive and tensile strain. The ability to simultaneously vary strain, temperaand field facilitates a better understanding of how these parameters affect flux pinning mechanisms. From a technological point of view, these measurements provide essential design data for developing cryocooled high magnetic field systems.

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Section: A Critical Current Densitysupporting

confidence: 85%

Variable-temperature transport critical currents of niobium-tin wires under strain in high magnetic fields

Cheggour

Hampshire

1999

IEEE Trans. Appl. Supercond.

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“…The strain value m ͑ϭ0.26%͒ is the same for both temperatures, and is in good agreement with the VAMAS program report. 39 Figure 7 also shows the reversibility of the J c with strain. Details of these results are published elsewhere.…”

Section: Resultsmentioning

confidence: 99%

A probe for investigating the effects of temperature, strain, and magnetic field on transport critical currents in superconducting wires and tapes

Cheggour¹,

Hampshire²

2000

Review of Scientific Instruments

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Unifying the strain and temperature scaling laws for the pinning force density in superconducting niobium-tin multifilamentary wires

Cheggour

Hampshire

1999

Journal of Applied Physics

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Systematic variable temperature measurements of the transport critical current density (Jc) tolerance to strain (ε), performed on a bronze processed niobium-tin multifilamentary wire in high magnetic fields up to 15 T, are reported. The results show that Bc2*(T,ε), the field at which the pinning force density (Fp) extrapolates to zero, can be written as Bc2*(0,ε)g[T/Tc*(ε)], where g is a function of the reduced temperature T/Tc*(ε) and Tc*(ε) is the temperature at which Bc2* extrapolates to zero. We propose a magnetic field, temperature, and strain scaling law for Fp which unifies Ekin’s strain scaling law and the Fietz–Webb variable temperature scaling law. It is of the form Fp=Jc×B=A(ε)[Bc2*(T,ε)]nbp(1-b)q, where n, p, and q are constants, A(ε) is a function of strain alone, and b is the reduced field B/Bc2*.

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V-2: Effects of stress/strain

Cited by 5 publications

References 3 publications

Variable-temperature transport critical currents of niobium-tin wires under strain in high magnetic fields

Variable-temperature transport critical currents of niobium-tin wires under strain in high magnetic fields

A probe for investigating the effects of temperature, strain, and magnetic field on transport critical currents in superconducting wires and tapes

Unifying the strain and temperature scaling laws for the pinning force density in superconducting niobium-tin multifilamentary wires

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