Abstract
Surface coatings, like titanium nitride (TiN) and
diamond-like carbon (DLC) coatings offer high wear
resistance and low friction performance for a wide range
of applications. By using new techniques like modelling
and simulation, the coating performance under load can be
estimated and thus provide valuable information for the
coating design and for the use of coatings in different
applications.
A three dimensional Finite Element Method (3D FEM) model
has been developed for calculating both the first
principal stress distribution and the true stress
components in the scratch test contact as the spherical
diamond tip is moving with increased load on a titanium
nitride (TiN) and diamond-like carbon (DLC) coated steel
surface. The three dimensional model is comprehensive in
the sense that it considers elastic, plastic and fracture
behaviour of the contacting surfaces. Three main regions
of stress concentration during the scratching action has
been identified and analysed.
The first cracks to appear on the surface of a high speed
steel sample coated with a 2 ìm TiN coating or 1 ìm DLC
coating are angular cracks on the edge of the scratch
channel as the spherical diamond tip is sliding on the
coated surface. This corresponds to the area of high two
directional stresses occurring at the side of the scratch
channel. By identifying the location of the first crack
and the crack density along the scratch channel and by
using this as input data the fracture toughness of the
coating can be evaluated. The influence of the coating
thickness and elastic modulus on the stresses and strains
generated during the sliding process is demonstrated.
Original language | English |
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Number of pages | 13 |
Publication status | Published - 2006 |
MoE publication type | Not Eligible |
Event | 3rd Mikkeli International Industrial Coating Seminar, MIICS 2006 - Mikkeli, Finland Duration: 16 Mar 2006 → 18 Mar 2006 |
Conference
Conference | 3rd Mikkeli International Industrial Coating Seminar, MIICS 2006 |
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Abbreviated title | MIICS 2006 |
Country/Territory | Finland |
City | Mikkeli |
Period | 16/03/06 → 18/03/06 |
Keywords
- ProperTune