Crack resistance and fracture toughness of PZT ceramics

Theo Fett; Marc Kamlah; Dietrich Munz; Gerhard Thun

doi:10.1117/12.432760

11 July 2001 Crack resistance and fracture toughness of PZT ceramics

Theo Fett, Marc Kamlah, Dietrich Munz, Gerhard Thun

Proceedings Volume 4333, Smart Structures and Materials 2001: Active Materials: Behavior and Mechanics; (2001) https://doi.org/10.1117/12.432760
Event: SPIE's 8th Annual International Symposium on Smart Structures and Materials, 2001, Newport Beach, CA, United States

Abstract

Failure of PZT materials is governed by the crack resistance curve (R-curve). The R-curve was evaluated for a soft PZT: (a) in controlled fracture tests with single-edge-notched bending bars via an improved compliance method combining mechanical compliance and microscopic crack length measurement, (b) by completely stable crack extension tests with a loading device consisting of two pairs of opposite line loads. It was found that the R-curves obtained with different test methods differ strongly. A possible interpretation of the differences is given. A theoretical part deals with the determination of the stress intensity factor solution for bending bars with edge cracks as used in the experiments. Piezoelectric materials exhibit a non-linear stress-strain curve and non-symmetry in tension and compression. Under these conditions the non- linear stress distribution is computed for the bending bar and the stress intensity factor is determined by using the fracture mechanics weight function method. From these computations it results that maximum deviations from the linear-elastic solution of less than 2% occur if a/W>0.3(a=crack length, W=specimen width). In case of the roller loading, it can be shown that maximum errors must be less than 7%.

Citation Download Citation

Theo Fett, Marc Kamlah, Dietrich Munz, and Gerhard Thun "Crack resistance and fracture toughness of PZT ceramics", Proc. SPIE 4333, Smart Structures and Materials 2001: Active Materials: Behavior and Mechanics, (11 July 2001); https://doi.org/10.1117/12.432760

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