Vol. 4, No. 4, 2009

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ISSN: 1559-3959
Dynamic fatigue of cracked piezoelectric ceramics under electromechanical loading: three-point bending test and finite element analysis

Yasuhide Shindo, Fumio Narita and Mitsuru Hirama

Vol. 4 (2009), No. 4, 719–729
Abstract

This paper studies the dynamic fatigue or slow crack growth in piezoelectric ceramics under electromechanical loading by a combined numerical-experimental approach. Constant load-rate testing was conducted in three-point flexure using the single-edge precracked-beam specimens under zero and positive electric fields, and the effects of electric field and loading-rate on the fracture load and crack propagation were examined. A finite element analysis was also employed to calculate the energy release rate for the permeable, impermeable and open crack models, and the effect of electric field on the energy release rate was discussed. Crack propagation velocity versus energy release rate curves at various loading-rate were then estimated based on the finite element analysis using measured data.

Keywords
elasticity, finite element method, material testing, piezoelectric materials, dynamic fatigue, smart materials and structures
Milestones
Received: 8 November 2007
Revised: 1 August 2008
Accepted: 11 August 2008
Published: 7 August 2009
Authors
Yasuhide Shindo
Department of Materials Processing
Graduate School of Engineering
Tohoku University
Sendai 980-8579
Japan
Fumio Narita
Department of Materials Processing
Graduate School of Engineering
Tohoku University
Sendai 980-8579
Japan
Mitsuru Hirama
Department of Materials Processing
Graduate School of Engineering
Tohoku University
Sendai 980-8579
Japan