Evaluation of Young’s modulus of MgB<sub>2</sub>filaments in composite wires for the superconducting links for the high-luminosity LHC upgrade

Sugano, M.; Ballarino, A.; Bártová, Barbora; Bjoerstad, R.; Gerardin, Alexandre; Scheuerlein, C.

doi:10.1088/0953-2048/29/2/025009

Cited by 12 publications

(5 citation statements)

References 17 publications

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“…As one can see, the Young's moduli of the tested metals are between 59 and 234 GPa at room temperature and between 117 and 245 GPa at liquid helium. The literature data for the Young's moduli of MgB 2 at room temperature are between 97-190 GPa for filaments of PIT wires made with in situ and ex situ processes having porosity of 20%-50% [28][29][30][31][32], but from 208 GPa to 273 GPa for hot pressed MgB 2 bulk [33]. In the present case, the Young's moduli of IMD filaments would be higher than for PIT ones due to no porosity and the very low content of MgO phase [4][5][6].…”

Section: Properties Of Metallic Components and Composite Wiresmentioning

confidence: 99%

Current densities and strain tolerances of filamentary MgB₂ wires made by an internal Mg diffusion process

Kòváč¹,

Kopera²,

Kováč³

et al. 2019

Supercond. Sci. Technol.

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Engineering current densities and tensile strain effects in filamentary MgB2 wires manufactured by the diffusion of magnesium into boron (IMD) process have been examined at a 4.2 K and with an external field of 6–7.5 T. MgB2 wires with 6 or 7 filaments, Nb or Ti barriers and Monel®, GlidCop® and HITEMAL® outer sheaths were examined and compared with commercially produced MgB2 conductors. IMD wires allow for higher engineering current densities in comparison to commercial wires produced by the powder-in-tube (PIT) process, but a uniform Mg/B ratio in the as-formed IMD wires is extremely important for long-length homogeneity. IMD and PIT wire samples were loaded progressively to determine the irreversible strain limit (εirr) and stress limit (σirr) defined as the maximum loaded strain or stress where the critical current (Ic) is still reversible. It was found that the strain tolerances of the tested MgB2 wires are affected by the metallic components used. The wire with the lowest content of metallic elements (Nb/Monel®) led to the lowest strain tolerance (εirr = 0.30%). Alternately, the wire with stronger GlidCop®/Monel® sheath resulted in the best strain tolerance (εirr > 0.50%).

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Section: Properties Of Metallic Components and Composite Wiresmentioning

confidence: 99%

Current densities and strain tolerances of filamentary MgB₂ wires made by an internal Mg diffusion process

Kòváč¹,

Kopera²,

Kováč³

et al. 2019

Supercond. Sci. Technol.

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“…Under the assumptions that the thickness (h 1 ) and Young's modulus (E 1 ) of the MgB 2 thin-film are, respectively, 1 μm and 230 GPa, 28) and thickness (h 2 ) and Young's modulus (E 2 ) of the copper substrate are, respectively, 100 μm and 117 GPa, the distance from the MgB 2 thin-film surface to the neutral plane (λ) is calculated from Eq. (1): 27)…”

Section: Discussionmentioning

confidence: 99%

Flexural properties of a MgB₂ thin-film wire

Iwanaka

Kusunoki²,

Kotaki³

et al. 2023

Jpn. J. Appl. Phys.

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Aiming to understand the bending characteristics of MgB2 thin-film wire and utilize the wire in the design of superconducting magnets, we examined the degradation of critical current density Jc due to bending. Six short MgB2 thin-film wire with thickness of 1 µm, were prepared under a same deposition conditions. They were bent in different radius, and their Jc were compared. The allowable bending radius at which Jc does not degrades was 25.0 mm. As for MgB2 thin-film wires, thickening the film effectively increase engineering critical current density Je . On the basis of material mechanics, the allowable bending radius was estimated to be 25.5 mm when the film thickness increased to 10 µm. The allowable bending radius of the MgB2 thin-film wire is sufficiently smaller than the radius of a typical superconducting coil, so it is not considered to be a barrier to fabricating a coil with the wire.

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“…Results in the literature (EMgB2=76-172 GPa [9], [20]) show a strong dependence on the manufacturing process, material structure and measurement methods. The Young's moduli of Monel and Nickel measured by nano-indentation tests are in agreement with published values (EMonel=160-185 GPa [8], [21] and ENi=186-207 GPa [9], [22]) regarding the different manufacturing processes. Nano-hardness is related to the initial size of the elastic domain and can be used to constrain the elastic limits when optimizing model parameters as described in Section III.…”

Section: B Numerical Representation Of the Strandmentioning

confidence: 99%

“…In the framework of this project, a commercial MgB2 strand used in superconducting cables based on the "react-and-wind" process was studied. Several studies have investigated the mechanical properties of MgB2 strands with different structures [5]- [9]. However, electrical modeling requires an accurate description of the mechanical behavior of the strand.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characterization and Modeling of a Powder-In-Tube MgB₂ Strand

Lenoir

Aubin

2017

IEEE Trans. Appl. Supercond.

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The strain dependence of superconducting material is known to be responsible for the degradation of the electrical performance of cables. As such, their electrical optimization requires an understanding of their mechanical behavior. The present paper introduces a method for elasto-plastic modeling of commercial MgB2 multi-filamentary strands manufactured by the ex-situ powder-in-tube method. The model is based on a simplified representation of the structure, built using components' volume fractions and nano-indentation test data. Monotonic and cyclic tension-compression tests were performed on the strands before and after chemical dissolution of the Monel outer layer to provide a multi-scale experimental database. These tests were used to identify the parameters of the kinematic and isotropic hardening laws of the elasto-plastic model. The model intends to be subsequently used to simulate the electrical behavior of cables and define guidelines for the manufacturing process, cabling process and end-product operating condition.

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Evaluation of Young’s modulus of MgB₂filaments in composite wires for the superconducting links for the high-luminosity LHC upgrade

Cited by 12 publications

References 17 publications

Current densities and strain tolerances of filamentary MgB₂ wires made by an internal Mg diffusion process

Current densities and strain tolerances of filamentary MgB₂ wires made by an internal Mg diffusion process

Flexural properties of a MgB₂ thin-film wire

Mechanical Characterization and Modeling of a Powder-In-Tube MgB₂ Strand

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Evaluation of Young’s modulus of MgB2filaments in composite wires for the superconducting links for the high-luminosity LHC upgrade

Cited by 12 publications

References 17 publications

Current densities and strain tolerances of filamentary MgB2 wires made by an internal Mg diffusion process

Current densities and strain tolerances of filamentary MgB2 wires made by an internal Mg diffusion process

Flexural properties of a MgB2 thin-film wire

Mechanical Characterization and Modeling of a Powder-In-Tube MgB2 Strand

Contact Info

Product

Resources

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Evaluation of Young’s modulus of MgB₂filaments in composite wires for the superconducting links for the high-luminosity LHC upgrade

Current densities and strain tolerances of filamentary MgB₂ wires made by an internal Mg diffusion process

Current densities and strain tolerances of filamentary MgB₂ wires made by an internal Mg diffusion process

Flexural properties of a MgB₂ thin-film wire

Mechanical Characterization and Modeling of a Powder-In-Tube MgB₂ Strand