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An effective thermal conductivity and thermomechanical homogenization scheme for a multiscale Nb3Sn filaments

Authors
  • Zhao, Xiaoyu1
  • Wang, Guannan2, 3
  • Chen, Qiang4
  • Duan, Libin5
  • Tu, Wenqiong5
  • 1 Department of Automotive Engineering, School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, China , (China)
  • 2 Center for Balanced Architecture, Zhejiang University, China , (China)
  • 3 Department of Civil Engineering, Zhejiang University, China , (China)
  • 4 Arts et Métiers Institute of Technology, CNRS, Universitéde Lorraine, LEM3-UMR7239, France , (France)
  • 5 Department of Vehicle Engineering, School of Automotive and Traffic Engineering, Jiangsu University, China , (China)
Type
Published Article
Journal
Nanotechnology Reviews
Publisher
De Gruyter
Publication Date
Apr 19, 2021
Volume
10
Issue
1
Pages
187–200
Identifiers
DOI: 10.1515/ntrev-2021-0015
Source
De Gruyter
Keywords
Disciplines
  • Research Article
License
Green

Abstract

A comprehensive study of the multiscale homogenized thermal conductivities and thermomechanical properties is conducted towards the filament groups of European Advanced Superconductors (EAS) strand via the recently proposed Multiphysics Locally Exact Homogenization Theory (LEHT). The filament groups have a distinctive two-level hierarchical microstructure with a repeating pattern perpendicular to the axial direction of Nb3Sn filament. The Nb3Sn filaments are processed in a very high temperature between 600 and 700°C, while its operation temperature is extremely low, −269°C. Meanwhile, Nb3Sn may experience high heat flux due to low resistivity of Nb3Sn in the normal state. The intrinsic hierarchical microstructure of Nb3Sn filament groups and Multiphysics loading conditions make LEHT an ideal candidate to conduct the homogenized thermal conductivities and thermomechanical analysis. First, a comparison with a finite element analysis is conducted to validate effectiveness of Multiphysics LEHT and good agreement is obtained for the homogenized thermal conductivities and mechanical and thermal expansion properties. Then, the Multiphysics LEHT is applied to systematically investigate the effects of volume fraction and temperature on homogenized thermal conductivities and thermomechanical properties of Nb3Sn filaments at the microscale and mesoscale. Those homogenized properties provide a full picture for researchers or engineers to understand the Nb3Sn homogenized properties and will further facilitate the material design and application.

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