Design maps for failure of all-ceramic layer structures in concentrated cyclic loading

Sanjit Bhowmick, Juan José Meléndez-Martínez, Yu Zhang, Brian R. Lawn

Research output: Contribution to journalArticle

Abstract

A study is made of the competition between failure modes in ceramic-based bilayer structures joined to polymer-based substrates, in simulation of dental crown-like structures with a functional but weak "veneer" layer bonded onto a strong "core" layer. Cyclic contact fatigue tests are conducted in water on model flat systems consisting of glass plates joined to glass, sapphire, alumina or zirconia support layers glued onto polycarbonate bases. Critical numbers of cycles to take each crack mode to failure are plotted as a function of peak contact load on failure maps showing regions in which each fracture mode dominates. In low-cycle conditions, radial and outer cone cracks are competitive in specimens with alumina cores, whereas outer cone cracks prevail in specimens with zirconia cores; in high-cycle conditions, inner cone cracks prevail in all cases. The roles of other factors, e.g. substrate modulus, layer thickness, indenter radius and residual stresses from specimen preparation, are briefly considered.

Original languageEnglish (US)
Pages (from-to)2479-2488
Number of pages10
JournalActa Materialia
Volume55
Issue number7
DOIs
StatePublished - Apr 2007

Keywords

  • Fatigue
  • Fracture
  • Multilayers

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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