The effect of axial and transverse loading on the transport properties of ITER Nb3Sn strands

被引：73

作者：

Nijhuis, A. ^{[1
]}

van Meerdervoort, R. P. Pompe ^{[1
]}

Krooshoop, H. J. G. ^{[1
]}

Wessel, W. A. J. ^{[1
]}

Zhou, C. ^{[1
]}

Rolando, G. ^{[1
]}

Sanabria, C. ^{[2
]}

Lee, P. J. ^{[2
]}

Larbalestier, D. C. ^{[2
]}

Devred, A. ^{[3
]}

Vostner, A. ^{[3
]}

Mitchell, N. ^{[1
]}

Takahashi, Y. ^{[4
]}

Nabara, Y. ^{[4
]}

Boutboul, T. ^{[5
]}

Tronza, V. ^{[6
]}

Park, S-H ^{[7
]}

Yu, W. ^{[8
]}

机构：

[1] Univ Twente, Fac Sci & Technol, NL-7522 NB Enschede, Netherlands

[2] NHMFL, Ctr Appl Superconduct, Tallahassee, FL 32310 USA

[3] ITER Int Org, F-13115 St Paul Les Durance, France

[4] Japan Atom Energy Agcy, Naka, Ibaraki 3110193, Japan

[5] Magnet Project Team, ITER Dept, E-08019 Barcelona, Spain

[6] ITER Ctr, Moscow 123182, Russia

[7] Natl Fus Res Inst, Taejon 305333, South Korea

[8] Chinese Acad Sci ASIPP, Inst Plasma Phys, Hefei 230031, Peoples R China

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2013年 / 26卷 / 08期

关键词：

CURRENT DENSITY; BENDING STRAIN; VOID FRACTION; MODEL COIL; CONDUCTOR; DEGRADATION; TENSILE; STRESS; DESIGN; IMPACT;

D O I：

10.1088/0953-2048/26/8/084004

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The differences in thermal contraction of the composite materials in a cable in conduit conductor (CICC) for the International Thermonuclear Experimental Reactor (ITER), in combination with electromagnetic charging, cause axial, transverse contact and bending strains in the Nb3Sn filaments. These local loads cause distributed strain alterations, reducing the superconducting transport properties. The sensitivity of ITER strands to different strain loads is experimentally explored with dedicated probes. The starting point of the characterization is measurement of the critical current under axial compressive and tensile strain, determining the strain sensitivity and the irreversibility limit corresponding to the initiation of cracks in the Nb3Sn filaments for axial strain. The influence of spatial periodic bending and contact load is evaluated by using a wavelength of 5 mm. The strand axial tensile stress-strain characteristic is measured for comparison of the axial stiffness of the strands. Cyclic loading is applied for transverse loads following the evolution of the critical current, n-value and deformation. This involves a component representing a permanent (plastic) change and as well as a factor revealing reversible (elastic) behavior as a function of the applied load. The experimental results enable discrimination in performance reduction per specific load type and per strand type, which is in general different for each manufacturer involved. Metallographic filament fracture studies are compared to electromagnetic and mechanical load test results. A detailed multifilament strand model is applied to analyze the quantitative impact of strain sensitivity, intrastrand resistances and filament crack density on the performance reduction of strands and full-size ITER CICCs. Although a full-size conductor test is used for qualification of a strand manufacturer, the results presented here are part of the ITER strand verification program. In this paper, we present an overview of the results and comparisons.

引用

页数：19

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