Size Effect in Fracture of Ceramics and Its Use To Determine Fracture Energy and Effective Process Zone Length

Zdeněk P. Bažant*, Mohammad T. Kazemi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

128 Scopus citations

Abstract

The paper shows that a previously proposed size effect law can be used to identify nonlinear fracture properties solely from measured maximum loads of geometrically similar ceramic fracture specimens of sufficiently different sizes. This law represents a first‐order global approximation of the deviations from linear elastic fracture mechanics, independent of the type of the toughening mechanism in the fracture process zone. It provides a simple and unambiguous way to determine the size‐ and shape‐independent values of the fracture energy the effective length of the process zone, and the effective crack‐tip opening displacement. It also yields the R curve, which is geometry (shape) dependent. The proximity of response to linear elastic fracture mechanics is characterized by a brittleness number, which is shape independent.

Original languageEnglish (US)
Pages (from-to)1841-1853
Number of pages13
JournalJournal of the American Ceramic Society
Volume73
Issue number7
DOIs
StatePublished - Jul 1990

Keywords

  • R curve
  • energy
  • fracture
  • mechanical properties
  • modeling

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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