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. This study elucidates the effects of the following factors on the new model of static coefficient of friction proposed by Nakahara: the difference between parabolic and spherical indenters, elastic deformation under the condition of contact with a substrate, i.e. film breakdown, and the adhesion force at the contact.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
