Method for measuring the mode-I fracture toughness in lead zirconate titanate (PZT)

Thomas Karastamatis; Christopher S. Lynch

doi:10.1117/12.388199

14 June 2000 Method for measuring the mode-I fracture toughness in lead zirconate titanate (PZT)

Thomas Karastamatis, Christopher S. Lynch

Proceedings Volume 3992, Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics; (2000) https://doi.org/10.1117/12.388199
Event: SPIE's 7th Annual International Symposium on Smart Structures and Materials, 2000, Newport Beach, CA, United States

Abstract

Previous measurements of the fracture toughness of PZT have relied on Vicker's indentations, bend specimens, and compact tension specimens. Vicker's indentations are qualitative and are not suitable for toughness measurements. Recent work has clearly shown that non-linear material behavior induces a non-linear stress gradient through other specimen geometries that must be accounted for to accurately determine the fracture toughness. This work describes the development of a measurement technique for the R-curve behavior of unpoled ferroelastic ceramics using 4-point bend specimens with semi-elliptical surface cracks. The model material is a soft, transparent composition of 8/65/35 lead lanthanum zirconate titanate. The aspect ratio is measured during crack growth. The non-linear stress gradient through the cross section calculated from strain gage data. A parametric study based on the analysis of Newman and Raju is used to elucidate the restrictions on application of this technique.

Citation Download Citation

Thomas Karastamatis and Christopher S. Lynch "Method for measuring the mode-I fracture toughness in lead zirconate titanate (PZT)", Proc. SPIE 3992, Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics, (14 June 2000); https://doi.org/10.1117/12.388199

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