New technique for determining the critical loads of a thin coating on a tool–steel substrate by considering the initiation of cracks in the coating

Jiling Feng, Yi Qin, Rejin Raghavan, J Michler, E. Almandoz, G.G. Fuentes

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


In this article, a mathematical algorithm is derived to accurately determine the critical load of indentation for the initiation of cracks on the surface of a hard coating on a soft substrate, based on the measurement of the diameter of circumferentialcracks in micro-indentation impressions. The critical load required for the initiation of the first crack predicted using this technique is shown to be in good agreement with experimental results, indicating the feasibility of the technique proposed. The rationality of the approach proposed was further explored by investigating the fracture mechanism of the surface in a multilayer-coated surface using a finite element model, which was developed with the parameterised modelling approach, in combination with the cohesive-zone model.
Original languageEnglish
Pages (from-to)1205-1212
Number of pages8
JournalProceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture
Issue number7
Early online date26 Apr 2012
Publication statusPublished - Jul 2012


  • critical load
  • fracture
  • indentation test
  • coating surface
  • new technique
  • thin coating
  • tool-steel substrate
  • initiation of cracks
  • coating

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