Effect of ODS-Cu Composition for Mechanical-Electromagnetic Property of Bronze-Processed &lt;formula formulatype="inline"&gt; &lt;tex Notation="TeX"&gt;${\rm Nb}_{3}{\rm Sn}$&lt;/tex&gt;&lt;/formula&gt; Superconducting Wire

Nishijima, G.; Watanabe, Kazuo; Ohata, K.; Nakagawa, Kouji; Iwaki, G.

doi:10.1109/tasc.2010.2043348

Cited by 22 publications

(12 citation statements)

References 11 publications

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“…A value of ∼0.4% for pre-compression strain was reported for CuNb or ODS (oxide dispersion-strengthened) Cu alloy composition [20], [24]. Similar idea could possibly increase the precompression strain and irreversible strain limit of Nb 3 Al wires.…”

Section: E Possibility Of Mechanical Property Improvementmentioning

confidence: 58%

“…In Fig. 4, I c -stress characteristic of the present wire was compared with that of a bronze-route Nb 3 Sn wire at 15 T and 4.2 K [20]. I c -stress curve of Nb 3 Al has a peak at 60 MPa, while that of Nb 3 Sn at 65 MPa.…”

Section: B Strain Dependence Of Critical Currentmentioning

confidence: 97%

“…A wire specimen, 4 cm in length, was mounted on the stress/strain-I c apparatus [20]. The apparatus consists of moving and fixed copper blocks, which serve both as current terminals and tensile testing fixtures.…”

Section: B Experimental Proceduresmentioning

confidence: 99%

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Strain Dependence of Critical Current for Nb<sub>3</sub>Al Superconducting Wire Fabricated by Restacked RHQT Process

Nishijima

Banno

Kitaguchi

2015

IEEE Trans. Appl. Supercond.

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Stress/strain dependence of critical current (I c ) was investigated for a restacked rapid-heating, quenching and transformation (RHQT) processed Nb 3 Al superconducting wire consisting of six solid-solution strands. Each strand has 78 filaments with 17.8 μm in diameter. The wire diameter and copper/ non-copper ratio are 0.808 mm and 1.57, respectively. The mechanical properties were measured at 15 T in liquid helium bath (4.2 K) using a strain apparatus that allows stress-free cooling of the sample. I c reached a maximum value of 175 A at an applied strain of 0.09% indicating that Nb 3 Al filaments are under a precompressive strain of a similar magnitude. I c reversibility was confirmed up to 0.3% tensile strain, suggesting that the intrinsic irreversible strain limit is at least as high as 0.2%.

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Section: E Possibility Of Mechanical Property Improvementmentioning

confidence: 58%

Section: B Strain Dependence Of Critical Currentmentioning

confidence: 97%

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Strain Dependence of Critical Current for Nb<sub>3</sub>Al Superconducting Wire Fabricated by Restacked RHQT Process

Nishijima

Banno

Kitaguchi

2015

IEEE Trans. Appl. Supercond.

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“…The tensile load is applied to the sample by moving the pull rod actuated by a stepping motor. The vertical motion was translated to horizontal one by a combination of the upper and lower cams which was shown in detail in [8,18]. Consequently, the end of the lower cam pushes the movable current terminal as shown by the arrow in Fig.…”

Section: Methodsmentioning

confidence: 99%

Establishment of strain measurement system for evaluation of strain effect in HTS tapes under magnetic field

Dedicatoria¹,

Shin²

2011

Progress in Superconductivity and Cryogenics

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Abstract--The evaluation of the electromechanical properties of HTS CC tapes is one of the foremost procedures to be done to ensure the applicability of superconducting wires to electric devices. A precise measurement of the stress and strain is important in deriving the mechanical properties under operating environment. Up to now, there is no standard test method yet for the electromechanical property evaluation of HTS tapes under self field and external magnetic field although there are already reports on the different devices used to evaluate these properties. Strain can be measured by adopting a strain gauge or a high resolution double extensometer. In this study, strain effect on I c in HTS CC tapes under magnetic fields was evaluated. Comparison of advantages and setback of strain measuring devices were discussed. In addition, a dual strain measurement system using both the SG and extensometer may be practical to lessen the burden in case one of the measuring devices does not work well.

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“…We prepared eight samples for the case of 0 MPa and two samples each for other joint pressure cases. The structure and system of the machine is the same as that used in reference [20]. The test section was immersed in liquid nitrogen after setting the joint samples.…”

Section: Tensile Testmentioning

confidence: 99%

Fundamental Investigation on Tensile Characteristics of a Mechanical Lap Joint of REBCO Tapes

Oguro

Tamura

Yanagi

et al. 2015

IEEE Trans. Appl. Supercond.

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This paper discusses tensile characteristics of a mechanical lap joint, which has been proposed and tested for jointwinding of a high-temperature superconducting (HTS) helical coil in the Large Helical Device type helical fusion reactor, FFHR-d1. Structural analysis for the helical coils in FFHR-d1 indicates that the maximum tensile strain along the HTS conductors and the maximum shear stress in HTS tapes region are 0.145% and 32 MPa, respectively under electromagnetic forces. Tensile test of the mechanical lap joint using Gadolinium Barium Copper Oxide (GdBCO) tapes with an inserted indium foil showed that the joint having 5-mm length and 5-mm width with a joint pressure of > 11 MPa had tensile strength exceeding that of the GdBCO tape itself, which also allows the tensile strain of 0.145% when used in the helical coil. To tolerate the shear stress of 32 MPa, the joint pressure of > 50 MPa was found to be needed according to the experimental results.Index Terms-FFHR-d1, fusion reactor design, helical, hightemperature superconductors, superconducting magnets.

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Effect of ODS-Cu Composition for Mechanical-Electromagnetic Property of Bronze-Processed <formula formulatype="inline"> <tex Notation="TeX">${\rm Nb}_{3}{\rm Sn}$</tex></formula> Superconducting Wire

Cited by 22 publications

References 11 publications

Strain Dependence of Critical Current for Nb<sub>3</sub>Al Superconducting Wire Fabricated by Restacked RHQT Process

Strain Dependence of Critical Current for Nb<sub>3</sub>Al Superconducting Wire Fabricated by Restacked RHQT Process

Establishment of strain measurement system for evaluation of strain effect in HTS tapes under magnetic field

Fundamental Investigation on Tensile Characteristics of a Mechanical Lap Joint of REBCO Tapes

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