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Proceedings Paper

Theoretical investigations of the cracking of ferroelectric ceramics
Author(s): Meinhard Kuna; Andreas Ricoeur
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Paper 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.

Paper Details

Date Published: 14 June 2000
PDF: 12 pages
Proc. SPIE 3992, Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics, (14 June 2000); doi: 10.1117/12.388203
Show Author Affiliations
Meinhard Kuna, Freiberg Univ. of Mining and Technology (Germany)
Andreas Ricoeur, Freiberg Univ. of Mining and Technology (Germany)

Published in SPIE Proceedings Vol. 3992:
Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics
Christopher S. Lynch, Editor(s)

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