Abstract
Friction characteristics with respect to surface topographic orientation were investigated using surfaces of different materials and fabricated with grooves of different scales. Scratching friction tests were conducted using a nano-indentation-scratching system with the tip motion parallel or perpendicular to the groove orientation. Similar friction anisotropy trends were observed for all the surfaces studied, which are (1) under a light load and for surfaces with narrow grooves, the tip motion parallel to the grooves offers higher friction coefficients than does that perpendicular to them, (2) otherwise, equal or lower friction coefficients are found under this motion. The influences of groove size relative to the diameter of the mating tip (as a representative asperity), surface contact stiffness, contact area, and the characteristic stiction length are discussed. The appearance of this friction anisotropy is independent of material; however, the boundary and the point of trend transition depend on material properties.
| Original language | English (US) |
|---|---|
| Article number | 988 |
| Journal | Scientific reports |
| Volume | 2 |
| DOIs | |
| State | Published - 2012 |
Funding
We would like to express our sincere gratitude to support from US National Science Foundation and Chinese Scholarship Council. We would like to thank Dr. Tom Lai for supplying the tungsten carbide material, Dr. Bo He on his assistance in testing and Dr. Wei Chen on his suggestions for stiction length analysis. We would also like to thank Mr. Zhe Li, Mr. Fan Zhou and Mr. Zhen Zhang for their help on SEM imaging, and Mr. Hualong Yu, Dr. Xiaoqing Jin, and Professor Jiadao Wang for valuable discussions.
ASJC Scopus subject areas
- General