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Simulation of Crack Propagation in Three-Point Bending Piezoelectric Beam Based on Three-Dimensional Anisotropic Piezoelectric Damage Mechanics

Published online by Cambridge University Press:  07 December 2011

X. H. Yang ,
W. Z. Cao  and
X. B. Tian
X. H. Yang
Affiliation:
School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
W. Z. Cao*
Affiliation:
School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
X. B. Tian
Affiliation:
School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China
*
**Ph.D candidate, corresponding author
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Abstract

A finite element method combined with three-dimensional anisotropic piezoelectric continuum damage mechanics is presented to simulate quasi-static crack propagation behavior in piezoelectric ceramics in this paper. In this method, the three-dimensional anisotropic piezoelectric damage constitutive model is utilized for characterizing the effects of mechanical and electrical damages on the fields near the crack tip, the combined-damage from the dominant mechanical and electrical damage components is regarded as the fracture criterion, and the gradient of combined-damage is assumed to control crack growth direction. A set of numerical simulations of the midspan crack propagation in a three-point bending PZT-4 beam are performed in various loading conditions. After the numerical results are validated by comparison with the corresponding experimental ones, the effects of mechanical and electrical loads on the cracking be havior are respectively evaluated. It is found from the obtained results that mechanical and electrical loads influence on the damage fields in the vicinity of the crack-tip, as well as the crack growth rate, in a significant way. With the increment in mechanical loading, the crack growth rate obviously increases. This means that positive and negative electric fields enhance and inhibit crack propagation, respectively.

Keywords

Anisotropic piezoelectric damage constitutive modelCombined damageFracture criterionQuasi-static crack propagation.
Type
Articles
Information
Journal of Mechanics , Volume 27 , Issue 4 , December 2011 , pp. 521 - 531
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2011

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