Effect of fatigue loading on critical current in stainless steel–laminated DI-BSCCO superconducting composite tape

Hojo, Masaki; Osawa, Kenta; Adachi, Taiji; Inoue, Yasuhiro; Osamura, Kōzō; Ochiai, Shojiro; Ayai, N.; Hayashi, Kazuhiko

doi:10.1016/j.physc.2010.05.116

Cited by 11 publications

(3 citation statements)

References 16 publications

(25 reference statements)

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“…Finally, σ HT95% I c is shown in equation ( 9): The critical tensile strain of Type H (ε H95% I c ) at 77 K is needed to estimate the critical tensile strength of Type HT (σ HT95% I c ). In this paper, ε H95% I c = 0.25% which were the results of the tensile test of Type H in [15]. Other physical parameters are shown in table 2.…”

Section: Mechanical Testsmentioning

confidence: 80%

Recent progress on improvement to mechanical properties of DI-BSCCO wire

Yamazaki¹,

Kagiyama²,

Kikuchi³

et al. 2012

Supercond. Sci. Technol.

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To improve the mechanical properties of silver-sheathed BSCCO wire, the laminated BSCCO wires with stainless steel were made under some experimental conditions. The dependence of the stainless steel thickness and the dependence of the pre-tension of stainless steel tapes on the laminated BSCCO were investigated by mechanical tests (tensile test at 77 K and RT and double-bending test at RT) using short samples. Due to the difference of the coefficient of thermal expansion (CTE) and the relaxation to equilibrium after removing the total pre-tension of no laminated BSCCO (insert tape) and stainless steel tapes, the residual axial compressive strain applies to an insert tape after the lamination process. A high compressive strain up to the compressive yield of the silver-alloy is so useful for improvement of the mechanical properties of BSCCO wire. Measurement results were approximately the same as the simple model calculated from the residual strain applied to an insert tape by the difference of CTE and pre-tension. The stainless-steel-laminated BSCCO wire ‘Type HT-SS’ has been able to be achieved over 500 MPa at 77 K by increasing stainless steel thickness and the residual axial compression for an insert tape. The developed tough DI-BSCCO has a higher hoop force to compare with YBCO-coated conductor using Hastelloy substrates under the same circumstances such as magnetic field, winding diameter and transport current.

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Section: Mechanical Testsmentioning

confidence: 80%

Recent progress on improvement to mechanical properties of DI-BSCCO wire

Yamazaki¹,

Kagiyama²,

Kikuchi³

et al. 2012

Supercond. Sci. Technol.

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“…Then the abrupt and accelerated degradation in I c at ∼400 MPa, while the n-value is more sensitive, is where the onset of filament crack propagation is expected. The cyclic nature of the repetitive hoop stress test may have also affected I c versus σ h behaviour [23,28], but the effect is assumed to be minimal for a small number of cycles at low stress below critical limit. The important result here is the confirmation that the conductor degrades homogeneously over the distances v1, v2, and v3 under a homogeneous hoop stress loading, in agreement with our previous results on HT-CA and HT-SS conductors.…”

Section: Test Results At Lncmimentioning

confidence: 99%

Hoop stress test on new high strength alloy laminated Bi-2223 conductor

Miyoshi¹,

Nishijima

Kitaguchi

et al. 2015

Supercond. Sci. Technol.

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Bi-2223, despite its high field transport performance, lacks mechanical strength and relies on lamination technology for applications where both current density and mechanical strength are important. The hoop stress limits of a newly available high-strength Bi-2223 has been measured by two different methods at LNCMI-Grenoble and Tsukuba Magnet Laboratory. The measurements confirm the new conductor's high tensile strength up to 400 MPa. We discuss briefly the role of bending strain with the aid of a supplementary hoop stress measurement with reduced winding diameter.

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“…Their results indicated that at stress levels less than 315 MPa there is a 98% I c retention up to 10 6 cycles. 48) 4.2 Thermal properties An important parameter for the design of HTS current leads is the knowledge of the thermal conductivity of HTS conductors. For applications to the current leads of superconducting magnets, the thermal conductivity of the current leads must be low enough to reduce heat transfer from current leads to magnets.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Present Status and Future Perspective of Bismuth-Based High-Temperature Superconducting Wires Realizing Application Systems

Sato

Kobayashi

Nakashima

2011

Jpn. J. Appl. Phys.

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Among a series of high-temperature superconducting materials that have been discovered to date, (Bi,Pb)2Sr2Ca2Cu3O10-x is the best candidate for superconducting wires that are long with commercial productivity, and critical current performance. In particular, the controlled overpressure (CT-OP) sintering technique gave us a 100% density of (Bi,Pb)2Sr2Ca2Cu3O10-x portion, which leads to robustness, increase in critical current, and mechanical tolerance. Many application prototypes are already verified and are being evaluated worldwide. Current leads for large magnets and magnetic billet heaters are already commercial products. Commercial applications for power cables, motors for ship propulsion and electric vehicles, and many kinds of magnets are promising in the near future.

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Effect of fatigue loading on critical current in stainless steel–laminated DI-BSCCO superconducting composite tape

Cited by 11 publications

References 16 publications

Recent progress on improvement to mechanical properties of DI-BSCCO wire

Recent progress on improvement to mechanical properties of DI-BSCCO wire

Hoop stress test on new high strength alloy laminated Bi-2223 conductor

Present Status and Future Perspective of Bismuth-Based High-Temperature Superconducting Wires Realizing Application Systems

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