Mechanical behavior and strain dependence of the critical current of DI-BSCCO tapes

Osamura, Kōzō; Machiya, Shutaro; Suzuki, Hiroshi; Ochiai, Shojiro; Adachi, Hiroki; Ayai, N.; Hayashi, Kazuhiko; Sato, K.

doi:10.1088/0953-2048/21/5/054010

Cited by 43 publications

(53 citation statements)

References 7 publications

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“…Due to the different CTE of the constituent components, a thermal strain is generated in each component when the sample is cooled down from high temperature. The principal procedure to evaluate the thermal strain has been discussed previously [3]. As shown in Fig.…”

Section: Evaluation Of Thermal Strain Exerted On Rebco Layer At 77 Kmentioning

confidence: 99%

Mechanism for the uniaxial strain dependence of the critical current in practical REBCO tapes

Osamura¹,

Machiya²,

Hampshire³

2016

Supercond. Sci. Technol.

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. In order to elucidate the effect of uniaxial strain on the critical current of practical REBCO tapes (REBa2Cu3O7-d, RE = Y and Gd) fabricated by Superpower and SuNAM, two types of critical current measurements were carried out. In the first, the tape sample was attached directly to a universal testing machine and pulled under a tensile load. In the second, the tape was soldered to a Cu-Be springboard (SB) and then attached to the testing machine and then pushed or pulled in order to apply both tensile and compressive strains to the tape sample. An inverse parabolic behavior was observed for the uniaxial strain dependence of the critical current of both tapes.Using synchrotron radiation, the local strain exerted on the REBCO layer was measured at room temperature under the conditions used for the two techniques for making Ic measurements. On the basis of these room temperature data, the local strain exerted on the REBCO layer at 77 K was numerically evaluated.A one-dimensional chain model for current flow in the REBCO material with fractional lengths of A-domains and B-domains oriented along the uniaxial strain direction is proposed. The model can explain the parabolic strain behavior of the critical current and shows that the strain at which the peak in Ic occurs, is not only determined by pre-compression or pre-tension on the superconductor at the operating temperature, but also by the ratio of the fractional amounts of the two domains.

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Section: Evaluation Of Thermal Strain Exerted On Rebco Layer At 77 Kmentioning

confidence: 99%

Mechanism for the uniaxial strain dependence of the critical current in practical REBCO tapes

Osamura¹,

Machiya²,

Hampshire³

2016

Supercond. Sci. Technol.

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“…In another brass laminated tape a Bi-2223 filament pre-strain value of 0.11% has been determined by neutron diffraction at room temperature [22].…”

Section: E Bi-2223 Filament Axial Pre-compressionmentioning

confidence: 99%

Comparison of Electromechanical Properties and Lattice Distortions of Different Cuprate High-Temperature Superconductors

Scheuerlein

Bjoerstad

Grether

et al. 2016

IEEE Trans. Appl. Supercond.

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“…18 In general, tensile measurements are probably now most sensitively made using Nyilas extensometers. 19,20 However, measuring and understanding superconductors in compression is also necessary. Walters introduced a spring 21 (WASP) design to investigate long-length samples at low Efield (high sensitivity) under both compression and tension, in high fields.…”

Section: Introductionmentioning

confidence: 99%

Probes for investigating the effect of magnetic field, field orientation, temperature and strain on the critical current density of anisotropic high-temperature superconducting tapes in a split-pair 15 T horizontal magnet

Sunwong

Higgins

Hampshire

2014

Review of Scientific Instruments

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(2014) 'Probes for investigating the eect of magnetic eld, eld orientation, temperature and strain on the critical current density of anisotropic high-temperature superconducting tapes in a split-pair 15 T horizontal magnet.', Review of scientic instruments., 85 (6). 065111.Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We present the designs of probes for making critical current density (J c ) measurements on anisotropic high-temperature superconducting tapes as a function of field, field orientation, temperature and strain in our 40 mm bore, split-pair 15 T horizontal magnet. Emphasis is placed on the design of three components: the vapour-cooled current leads, the variable temperature enclosure, and the springboardshaped bending beam sample holder. The vapour-cooled brass critical-current leads used superconducting tapes and in operation ran hot with a duty cycle (D) of ∼0.2. This work provides formulae for optimising cryogenic consumption and calculating cryogenic boil-off, associated with current leads used to make J c measurements, made by uniformly ramping the current up to a maximum current (I max ) and then reducing the current very quickly to zero. They include consideration of the effects of duty cycle, static helium boil-off from the magnet and Dewar (b ), and the maximum safe temperature for the critical-current leads (T max ). Our optimized critical-current leads have a boil-off that is about 30% less than leads optimized for magnet operation at the same maximum current. Numerical calculations show that the optimum cross-sectional area (A) for each current lead can be parameterized by . A split-current-lead design is employed to minimize the rotation of the probes during the high current measurements in our high-field horizontal magnet. The variable-temperature system is based on the use of an inverted insulating cup that operates above 4.2 K in liquid helium and above 77.4 K in liquid nitrogen, with a stability of ±80 mK to ±150 mK. Uniaxial strains of −1.4% to 1.0% can be applied to the sample, with a total uncertainty of better than ±0.02%, using a modified bending beam apparatus which includes a copper beryllium springboard-shaped sample holder. © 2014 AIP Publishing LLC. [http://dx

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Mechanical behavior and strain dependence of the critical current of DI-BSCCO tapes

Cited by 43 publications

References 7 publications

Mechanism for the uniaxial strain dependence of the critical current in practical REBCO tapes

Mechanism for the uniaxial strain dependence of the critical current in practical REBCO tapes

Comparison of Electromechanical Properties and Lattice Distortions of Different Cuprate High-Temperature Superconductors

Probes for investigating the effect of magnetic field, field orientation, temperature and strain on the critical current density of anisotropic high-temperature superconducting tapes in a split-pair 15 T horizontal magnet

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