Modeling conical indentation in homogeneous materials and in hard films on soft substrates

Wangyang Ni, Yang Tse Cheng

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Dimensional analysis and finite element modeling were conducted to examine conical indentation in homogeneous materials and in hard films on soft substrates. In this paper, the solid materials modeled follow the incremental theory of plasticity with a von-Mises yield surface. The validity of the Oliver-Pharr method was examined. It was found that, for hard films on soft substrates, the Oliver-Pharr method is applicable only when the indentation depth is less than 10% of the film thickness. A linear relationship between the ratio of hardness to reduced modulus and the ratio of reversible work to total work was observed for conical indentation in homogeneous materials and in hard films on soft substrates. This relationship can be used to analyze instrumented indentation experiments.

Original languageEnglish
Pages (from-to)521-528
Number of pages8
JournalJournal of Materials Research
Volume20
Issue number2
DOIs
StatePublished - Feb 2005

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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