Theoretical investigations of the cracking of ferroelectric ceramics

Meinhard Kuna; Andreas Ricoeur

doi:10.1117/12.388203

14 June 2000 Theoretical investigations of the cracking of ferroelectric ceramics

Meinhard Kuna, Andreas Ricoeur

Proceedings Volume 3992, Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics; (2000) https://doi.org/10.1117/12.388203
Event: SPIE's 7th Annual International Symposium on Smart Structures and Materials, 2000, Newport Beach, CA, United States

Abstract

One of the most essential problems with ferroelectric ceramics is the low strength and durability of the brittle material, which prevents many most promising technical applications in mechatronics and adaptronics. In order to supply knowledge about design features and strength criteria and to improve the safety of components with smart ceramics, a more fundamental understanding about the process of fracture under combined mechanical and electrical loading is required. Therefore, numerical tools are developed permitting the stress analysis of arbitrarily shaped smart ceramics with a given crack under combined electromechanical loading boundary conditions. To solve the coupled electromechanical field problem, the FEM is used taking account of linear constitutive equations for an anisotropic piezoelectric continuum. Stress intensity factors and energy release rates are subsequently calculated inserting near tip nose values for mechanical displacements and forces as well as electrical potentials and charges. In connection with experiments on the cracking of Double Cantilever Beam specimens, the influence of electrical and mechanical loading conditions on the crack propagation is investigated. On the basis of calculated energy release rates and intensity factors as functions of the crack length, possible fracture criteria are discussed.

Citation Download Citation

Meinhard Kuna and Andreas Ricoeur "Theoretical investigations of the cracking of ferroelectric ceramics", Proc. SPIE 3992, Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics, (14 June 2000); https://doi.org/10.1117/12.388203

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