Coating fracture measurement by scratch test modelling

Kenneth Holmberg, Anssi Laukkanen, Helena Ronkainen, Kim Wallin, Simo Varjus

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

    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 languageEnglish
    Title of host publicationMikkeli International Industrial Coating Seminar, MIICS 2004
    EditorsDavid Cameron, Kaj Pischow, Paavo Ripatti
    Number of pages6
    Publication statusPublished - 2004
    MoE publication typeA4 Article in a conference publication
    Event2nd Mikkeli International Industrial Coating Seminar, MIICS 2004 - Mikkeli, Finland
    Duration: 18 Mar 200420 Mar 2004

    Seminar

    Seminar2nd Mikkeli International Industrial Coating Seminar, MIICS 2004
    CountryFinland
    CityMikkeli
    Period18/03/0420/03/04

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    Keywords

    • surface engineering
    • coatings
    • fracture
    • stress modelling
    • scratch test
    • fracture toughness
    • ProperTune

    Cite this

    Holmberg, K., Laukkanen, A., Ronkainen, H., Wallin, K., & Varjus, S. (2004). Coating fracture measurement by scratch test modelling. In D. Cameron, K. Pischow, & P. Ripatti (Eds.), Mikkeli International Industrial Coating Seminar, MIICS 2004