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Title
Japanese: 
English:A modified theoretical model of boundary friction in conjunction with rough-surface contacts, 
Author
Japanese: 中原 綱光, 桃園 聡.  
English: T. Nakahara, S. Momozono.  
Language English 
Journal/Book name
Japanese: 
English:Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 
Volume, Number, Page Vol. 222    No. 3    pp. 335-342
Published date May 2008 
Publisher
Japanese: 
English:Professional Engineering Publication Ltd. 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://journals.pepublishing.com/jet
 
DOI https://doi.org/10.1243/13506501JET365
Abstract This paper describes a modification of the theoretical model presented by Nakahara for estimating the static friction coefficient of the contact between rough surfaces and a boundary film. The theoretical model is modified from Halling's friction model for soft thin metallic films. The effective hardness in Halling's model is transposed with a new model, which is modified from Bhattacharya–Nix's equation for a conical indenter, in order to apply it to a spherical indenter on the basis of Johnson's cavity model. Nakahara's model takes into consideration the effect of pressure on the shear strength of the boundary film, which was suggested by Briscoe et al., and it can elucidate the effects of the following factors on the friction coefficient: apparent contact pressure, film thickness, the three parameters of roughness in Greenwood–Williamson's model, and the ratio of film bulk hardness to substrate hardness.

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