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Indentation strength of a piezoelectric ceramic: Experiments and simulations

Published online by Cambridge University Press:  31 January 2011

S.N. Kamble ,
D.V. Kubair  and
U. Ramamurty
S.N. Kamble
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
D.V. Kubair
Affiliation:
Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560012, India
U. Ramamurty*
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
*
a) Address all correspondence to this author. e-mail: ramu@materials.iisc.ernet.in
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Abstract

The spherical indentation strength of a lead zirconate titanate (PZT) piezoelectric ceramic was investigated under poled and unpoled conditions and with different electrical boundary conditions (arising through the use of insulating or conducting indenters). Experimental results show that the indentation strength of the poled PZT is higher than that of the unpoled PZT. The strength of a poled PZT under a conducting indenter is higher than that under an insulating indenter. Poling direction (with respect to the direction of indentation loading) did not significantly affect the strength of material. Complementary finite element analysis (FEA) of spherical indentation of an elastic, linearly coupled piezoelectric half-space is conducted for rationalizing the experimental observations. Simulations show marked dependency of the contact stress on the boundary conditions. In particular, contact stress redistribution in the coupled problem leads to a change in the fracture initiation, from Hertzian cracking in the unpoled material to subsurface damage initiation in poled PZT. These observations help explain the experimental ranking of strength the PZT in different material conditions or under different boundary conditions.

Keywords

PiezoelectricSimulationStrength
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 3 , March 2009 , pp. 926 - 935
Copyright
Copyright © Materials Research Society 2009

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