Tribological analysis of TiN and DLC coated contacts by 3D FEM stress modeling and fracture toughness determination

Kenneth Holmberg*, Helena Ronkainen, Anssi Laukkanen, Kim Wallin, Jari Koskinen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

3 Citations (Scopus)

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 such as modeling 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 moves 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 behavior of the contacting surfaces. Three main regions of stress concentration during the scratching action has been identified and analyzed. The first cracks to appear on the surface of a high-speed steel sample coated with a 2 μm TiN coating or 1 μm DLC coating are angular cracks on the edge of the scratch channel as the spherical diamond tip slides 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 languageEnglish
Title of host publicationApplied material research at VTT
EditorsAnne-Christine Ritschkoff, Jari Koskinen, Mika Paajanen
Place of PublicationEspoo
PublisherVTT
Pages311-328
Number of pages18
Volume244
ISBN (Print)9513863115, 9789513863111
Publication statusPublished - 2006
MoE publication typeA4 Article in a conference publication
EventApplied Material Research at VTT - Espoo, Finland
Duration: 8 Jun 20068 Jun 2006

Publication series

NameVTT symposium
PublisherVTT Technical Research Centre of Finland
Volume244
ISSN (Print)0357-9387

Conference

ConferenceApplied Material Research at VTT
CountryFinland
CityEspoo
Period08/06/200608/06/2006

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