Material specific nanoscratch ploughing friction coefficient. (October 2018)

• Record Type: Journal Article
• Authors: Carreon, Adam H.; Funkenbusch, Paul D.
• Is Part Of: Tribology international. Volume 126(2018)
• Page Start: 363
• Page End: 375
• Publication Date: 2018-10
• Subjects: Friction -- Nanoscratch -- Elastic recovery -- Ceramics -- Glass; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2018.05.027
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: In nanoscratch testing it is observed that the normal and tangential forces do not increase linearly. This behavior results in ploughing friction coefficients that vary with nanoindenter penetration depth. Lafaye and Troyon conducted research on ductile materials that concluded this is due to the nanoindenter not having an ideally sharp tip, but rather a blunt spherical one. The friction coefficient model, applied to brittle materials in this research, uses a previously published analytical friction coefficient model as its foundation, and extends it to include material-specific characteristics that effect friction coefficient behavior. Through the comparison between experiment and modeling, material characteristics such as pileup and nanoindenter contact area were found to aid in properly describing the friction coefficient of brittle materials. Highlights: Material pileup geometry is linearly proportional to nanoindenter penetration depth. Nanoindenter-material tangential and normal contact areas are both affected by material pileup. Contact mode between nanoindenter and material changes as a function of depth during a nanoscratch. The contact area and mode can be used to determine the coefficient of friction during a nanoscratch.