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Journal of Mechanical Science and Technology

, Volume 33, Issue 1, pp 475–484 | Cite as

A fractal model for predicting thermal contact conductance considering elasto-plastic deformation and base thermal resistances

  • Jinhua Zhang
  • Yili Liu
  • Ke YanEmail author
  • Bin Fang
Article
  • 32 Downloads

Abstract

A prediction model of thermal contact conductance is developed. Engineering rough surfaces are characterized by three-dimensional fractal Weierstrass-Mandelbrot fractal function. Three deformation modes, including fully plastic deformation, elasto-plastic deformation and elastic deformation, are considered to analyze the contact mechanism. Fractal surface and three deformation modes are incorporated into the calculation of thermal contact conductance. A comprehensive thermal contact conductance computation model considering both base thermal resistance and constricted thermal resistance is established. The results show that thermal contact conductance increases with the increase of normal contact pressure; the relative contribution of constricted resistance component to base resistance component tends to increase with the increase of normal contact pressure; fractal dimension and fractal roughness both have significant influences on thermal contact conductance.

Keywords

Thermal contact conductance Elasto-plastic deformation Fractal surface Base thermal resistance Constricted thermal resistance 

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Copyright information

© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Key Laboratory of Education Ministry for Modern Design & Rotor-Bearing System, School of Mechanical EngineeringXi’an Jiaotong UniversityXi’anChina

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