On fracture testing of piezoelectric ceramics

Yael Motola, Leslie Banks-Sills, Victor Fourman

Research output: Contribution to journalArticlepeer-review

Abstract

Fracture tests carried out on unpoled and poled PZT-5H four-point bend specimens are presented in this paper. The crack faces were parallel to the poling direction. Both mechanical loads and electric fields were applied to the poled specimens. The experimental results were analyzed by means of the finite element method and a conservative M -integral including the crack face boundary conditions. Fracture tests on four-point bend PIC-151 specimens with the crack faces perpendicular to the poling directions were also analyzed here; the experimental results were taken from the literature. A mixed mode fracture criterion is proposed for piezoelectric ceramics. This criterion is based upon the energy release rate and two phase angles. This criterion was implemented with experimental results from the literature and from this investigation. Excellent agrement was found between the fracture curve and the experimental results of the specimens with the crack faces perpendicular to the poling direction. With some scatter, reasonable agreement was observed between the fracture curve and the experimental results of the specimens with crack faces parallel to the poling direction.

Original languageEnglish
Pages (from-to)167-190
Number of pages24
JournalInternational Journal of Fracture
Volume159
Issue number2
DOIs
StatePublished - 2009

Keywords

  • Energy release rate
  • Finite element method
  • Fracture criterion
  • Fracture tests
  • Intensity factors
  • M-integral
  • Piezoelectric ceramics

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