Abstract
The contact condition with a sphere sliding over a plate
coated with a very thin coating is analysed. The dominant
parameters for friction and wear performance are
identified and the appropriate material parameters needed
for controlling the tribological contact is proposed. A
3D Finite Element Model has been developed for
calculating the first principal stress distribution in
the scratch tester contact of a diamond spherical tip
moving with increased load on a titanium nitride (TiN)
coated steel surface. The model is comprehensive in that
sense that it considers elastic, plastic and fracture
behaviour of the contacting surfaces. Three main regions
of stress concentration during the scratching action are
identified. The loading mechanisms and the stress
development in each of these regions are described. The
first cracks to occur in a TiN coated steel plate sliding
against a spherical diamond tip are due to the high
stresses in the side-stress region and they are in an
angular direction to the formed contact groove at the
side edge of the groove. By identifying from a scratch
experiment the location of the first crack and using this
as input data can the fracture toughness of the coating
be determined.
| Original language | English |
|---|---|
| Title of host publication | Mikkeli International Industrial Coating Seminar, MIICS 2004 |
| Editors | David Cameron, Kaj Pischow, Paavo Ripatti |
| Number of pages | 6 |
| Publication status | Published - 2004 |
| MoE publication type | A4 Article in a conference publication |
| Event | 2nd Mikkeli International Industrial Coating Seminar, MIICS 2004 - Mikkeli, Finland Duration: 18 Mar 2004 → 20 Mar 2004 |
Seminar
| Seminar | 2nd Mikkeli International Industrial Coating Seminar, MIICS 2004 |
|---|---|
| Country/Territory | Finland |
| City | Mikkeli |
| Period | 18/03/04 → 20/03/04 |
Keywords
- surface engineering
- coatings
- fracture
- stress modelling
- scratch test
- fracture toughness
- ProperTune