Heat transfer analysis during heat treatment of Nb3Sn coils for the CFETR CSMC

Qin, Jinggang; Yu, Miao; Li, Jiangang

doi:10.1016/j.fusengdes.2021.112248

Cited by 4 publications

(1 citation statement)

References 13 publications

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“…Several theoretical and numerical models have been presented to predict the mechanical properties of Nb 3 Sn strands [11,[29][30][31][32][33][34][35][36][37][38][39][40]. For instance, Boso et al [29][30][31][32] proposed a multi-scale numerical method for the composite strands based on the asymptotic homogenization theory.…”

Section: Introductionmentioning

confidence: 99%

Elastic–Plastic Mechanical Behavior Analysis of a Nb3Sn Superconducting Strand with Initial Thermal Damage

Zhang

Shi

2022

Applied Sciences

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It is well known that the parameters of Nb3Sn superconducting strands are strain sensitive, and the internal brittle Nb3Sn filament can easily break under deformations. A temperature difference from the preparation temperature of about 1000 K to the cryogenic working environment of 4.2 K damages brittle Nb3Sn fibers before working. Based on the Curtin–Zhou model, the damage theory for fiber-reinforced composites is utilized to study the influence of filament fractures caused by thermal stress. According to the typical multi-scale geometric of the EAS-Nb3Sn strand (European Advanced Superconductor, EAS), an efficient hierarchical homogenized calculation model considering filament fracture and matrix plasticity was established. In this work, we took the filament fracture caused by both thermal stresses and mechanical loads into consideration using the secant modulus and simultaneously had the impact of the plastic constitutive of the bronze matrix and the copper protective layer. Mechanical parameters, such as the homogenized secant modulus, shear modulus, and Poisson’s ratio in different directions of level scale, were predicted at various temperatures. The elastoplastic mechanical behavior of the strands subjected to axial load was analyzed, and the results were in good agreement with the experiment. The initial thermal fiber fracture has non-negligible effects on the mechanical properties of the EAS-Nb3Sn superconducting strand and play the role in accelerating the increase in fiber breakage.

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Section: Introductionmentioning

confidence: 99%

Elastic–Plastic Mechanical Behavior Analysis of a Nb3Sn Superconducting Strand with Initial Thermal Damage

Zhang

Shi

2022

Applied Sciences

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Safety Analysis of Heat Treatment System and TF Nb₃Sn Coil Joint Annealing Experiment

Wang

Han

et al. 2021

IEEE Trans. Appl. Supercond.

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Heat Transfer Analysis of MgB₂ Coil in Heat Treatment Process for Future Fusion Reactor

Wang

Yong-sheng

et al. 2023

IEEE Trans. Appl. Supercond.

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Heat transfer analysis during heat treatment of Nb3Sn coils for the CFETR CSMC

Cited by 4 publications

References 13 publications

Elastic–Plastic Mechanical Behavior Analysis of a Nb3Sn Superconducting Strand with Initial Thermal Damage

Elastic–Plastic Mechanical Behavior Analysis of a Nb3Sn Superconducting Strand with Initial Thermal Damage

Safety Analysis of Heat Treatment System and TF Nb₃Sn Coil Joint Annealing Experiment

Heat Transfer Analysis of MgB₂ Coil in Heat Treatment Process for Future Fusion Reactor

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Heat transfer analysis during heat treatment of Nb3Sn coils for the CFETR CSMC

Cited by 4 publications

References 13 publications

Elastic–Plastic Mechanical Behavior Analysis of a Nb3Sn Superconducting Strand with Initial Thermal Damage

Elastic–Plastic Mechanical Behavior Analysis of a Nb3Sn Superconducting Strand with Initial Thermal Damage

Safety Analysis of Heat Treatment System and TF Nb3Sn Coil Joint Annealing Experiment

Heat Transfer Analysis of MgB2 Coil in Heat Treatment Process for Future Fusion Reactor

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Product

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Safety Analysis of Heat Treatment System and TF Nb₃Sn Coil Joint Annealing Experiment

Heat Transfer Analysis of MgB₂ Coil in Heat Treatment Process for Future Fusion Reactor