Sliding contact fracture of dental ceramics: Principles and validation

Linlin Ren, Yu Zhang

Research output: Contribution to journalArticle

Abstract

Ceramic prostheses are subject to sliding contact under normal and tangential loads. Accurate prediction of the onset of fracture at two contacting surfaces holds the key to greater long-term performance of these prostheses. In this study, building on stress analysis of Hertzian contact and considering fracture criteria for linear elastic materials, a constitutive fracture mechanics relation was developed to incorporate the critical fracture load with the contact geometry, coefficient of friction and material fracture toughness. Critical loads necessary to cause fracture under a sliding indenter were calculated from the constitutive equation, and compared with the loads predicted from elastic stress analysis in conjunction with measured critical load for frictionless normal contact - a semi-empirical approach. The major predictions of the models were calibrated with experimentally determined critical loads of current and future dental ceramics after contact with a rigid spherical slider. Experimental results conform with the trends predicted by the models.

Original languageEnglish (US)
Pages (from-to)3243-3253
Number of pages11
JournalActa Biomaterialia
Volume10
Issue number7
DOIs
StatePublished - Jul 2014

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Keywords

  • Dental ceramics
  • Friction
  • Functionally graded ceramics
  • Sliding contact fracture
  • Toughness

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Biochemistry
  • Biomedical Engineering
  • Molecular Biology

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