Effect of indenter size on the cracking mechanism of ceramic film indentation

Kazuo Hayashi, Masao Tsujita

Research output: Contribution to journalArticlepeer-review

Abstract

Cracking is studied for a ceramic film coating (A12O 3) on a metal substrate (WC-Co) subjected to indentation by a spherical diamond indenter. The focus of the study is the pattern of crack growth and apparent variation of strength of the film with respect to size of indenters. To this end, we perform indentation experiments with indenters of five different radii. Based on the experimental results and FEM stress analysis, we discuss the apparent strength of the ceramic film using a Weibull distribution. It is found that only radial cracks are induced for a smaller indenter, but only circumferencial cracks are induced for a larger indenter. It is also revealed that the apparent strength of the film is strongly dependent on the size of indenters. For indenter radii above 500 μm, the variation of apparent strength with respect to the size of indenters is not so strong. Thus, the use of an indenter with a radius larger than 500 μm is recommended in order to obtain valid results.

Original languageEnglish
Pages (from-to)114-120
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume67
Issue number653
DOIs
Publication statusPublished - 2001

Keywords

  • Ceramic
  • Coating
  • Contact problem
  • Crack
  • Indentation
  • Probabilistic method

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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