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Indentation strength of a piezoelectric ceramic: Experiments and simulations

Kamble, SN and Kubair, DV and Ramamurthy, U (2009) Indentation strength of a piezoelectric ceramic: Experiments and simulations. In: International Symposium on Indentation Behavior of Materials, MAR 2009, Hyderabad, pp. 926-935.

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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.

Item Type: Conference Paper
Publisher: The Materials Research Society
Additional Information: Copyright for this article belongs to The Materials Research Society.
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 21 Aug 2009 06:16
Last Modified: 21 Aug 2009 06:16
URI: http://eprints.iisc.ac.in/id/eprint/21470

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