A fractal model for predicting thermal contact conductance considering elasto-plastic deformation and base thermal resistances
- 32 Downloads
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.
KeywordsThermal contact conductance Elasto-plastic deformation Fractal surface Base thermal resistance Constricted thermal resistance
Unable to display preview. Download preview PDF.
- J. A. Greenwood and J. B. P. Williamson, Contact of nominally flat surfaces, Proceedings of the Royal Society of London, 295 (1442) (1966) 300–319.Google Scholar
- A. Zhou, T. Chen, X. Wang and Y. Xi, Fractal contact spot and its application in the contact model of isotropic surfaces, Journal of Applied Physics, 370 (4) (2015) 3617.Google Scholar
- Y. R. Jeng and P. Y. Wang, An elliptical microcontact model considering elastic, elastoplastic, and plastic deformation, Encyclopedia of Lubricants & Lubrication, 125 (2) (2003) 292–292.Google Scholar
- C. Ma, L. Zhao, H. Shi, X. Mei and J. Yang, A geometrical-mechanical-thermal predictive model for thermal contact conductance in vacuum environment, Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, 230 (8) (2016) 1451–1464.Google Scholar
- C. Ma, L. Zhao, H. Shi, X. Mei and J. Yang, Experimental and simulation study on the thermal characteristics of the high-speed spindle system, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 231 (6) (2017) 1072–1093.Google Scholar
- Y. Zhao, C. Fang, L. Cai and Z. Liu, A three-dimensional fractal theory based on thermal contact conductance model of rough surfaces, Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering (2017) 0954408917727198.Google Scholar