Analysis of indentation-derived effective elastic modulus of metal-ceramic multilayers

G. Tang, Y. L. Shen, D. R P Singh, Nikhilesh Chawla

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

A numerical study was undertaken to study the elastic property of metal-ceramic multilayered composites derived from indentation testing. The model system features alternating thin films of aluminum (Al) and silicon carbide (SiC), free from any effect due to the underlying substrate. The anisotropic composite elastic response was obtained by simulating overall loading of the multilayer structure. Finite element modeling of instrumented indentation was then employed to calculate the indentation-derived modulus using the unloading portion of the load-displacement curve. The results from indenting the homogenized composite (with the built-in multilayer property) and from indenting the real multilayers (with Al and SiC layers explicitly accounted for) were compared. It was found that an indentation depth beyond approximately 8-10 initial layer thicknesses is sufficient to yield a valid composite elastic response. The effective modulus thus obtained is representative of the out-of-plane modulus of the multilayer composite.

Original languageEnglish (US)
Pages (from-to)391-398
Number of pages8
JournalInternational Journal of Mechanics and Materials in Design
Volume4
Issue number4
DOIs
StatePublished - Dec 1 2008

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Keywords

  • Elastic modulus
  • Finite element analysis
  • Indentation
  • Multilayer composite

ASJC Scopus subject areas

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

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