Critical role of domain switching on the fracture toughness of poled ferroelectrics

Citation
W. Yang et al., Critical role of domain switching on the fracture toughness of poled ferroelectrics, INT J SOL S, 38(10-13), 2001, pp. 2203-2211
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Mechanical Engineering
Journal title
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
ISSN journal
0020-7683 → ACNP
Volume
38
Issue
10-13
Year of publication
2001
Pages
2203 - 2211
Database
ISI
SICI code
0020-7683(200103)38:10-13<2203:CRODSO>2.0.ZU;2-Y
Abstract
Domain polarization switch near the tip of a flaw plays a critical role on the fracture of poled ferroelectric ceramics under mechanical loading. Smal l scale 90 degrees switching model is adopted with domain switch based on t he switching released work. The model focuses on the influence on the stres s intensity factor by 90 degrees switching. Different poling directions are explored. The case of out-of-plane poling is analyzed in detail, whose res ult indicates appreciable shielding on the SIF for crack growing in steady state. This prediction is supported qualitatively by Vickers indents data o f polycrystalline and single-crystalline ferroelectrics in which the differ ences in isotropic and anisotropic indentation tests can be explained quali tatively. (C) 2001 Elsevier Science Ltd. All rights reserved.