Abstract
Static friction is a phenomenon we may mainly consider as related to frictional joints within static mechanics. The step from static friction to tribological phenomena is, however, rather short, since at the onset of sliding in a mechanical contact, the static friction determines the initial resistance against motion. Static friction furthermore plays a role in contacts subjected to traction and fretting. Although being a phenomenon of short duration, the tribological phenomena during the transition from static friction to sliding friction may be of great importance for the operational life of the contact surfaces, particularly if the procedure is repeated for a sufficient number of times. The present paper describes the principles of static friction measurements, details of the employed static friction tribometer and the results of measurements with unlubricated and lubricated sliding couples consisting of steel against uncoated and coated cast iron.
| Original language | English |
|---|---|
| Pages (from-to) | 5-40 |
| Number of pages | 36 |
| Journal | Tribologia |
| Volume | 34 |
| Issue number | 1-2 |
| Publication status | Published - 1 Jan 2016 |
| Publication type | A1 Journal article-refereed |
Funding
The study was carried out as part of the Finnish joint industrial consortium strategic research action coordinated by FIMECC Ltd, within the program on Breakthrough Materials called DEMAPP, in the Friction and Energy Project. The authors gratefully acknowledge the financial support of Tekes, the Finnish Funding Agency for Technology and Innovation, the participating companies, and VTT Technical Research Centre of Finland, and the cast iron samples from the Componenta Corporation. The authors are furthermore grateful to the former colleagues Senior Research Technician Sini Eskonniemi of VTT Technical Research Centre of Finland, for the surface roughness measurements, and Research Scientist Ander Amasorrain Urrutia of VTT Technical Research Centre of Finland, for his contribution to the performing of the static friction measurements.
Keywords
- Friction transitions
- Sliding friction
- Static friction
- Tribometer
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Surfaces and Interfaces
- Surfaces, Coatings and Films