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Crack tip switching zone in ferroelectric ferroelastic materials

Kounga Njiwa, Alain Brice and Lupascu, Doru C. and Rödel, Jürgen (2004):
Crack tip switching zone in ferroelectric ferroelastic materials.
52, In: Acta Materialia, (16), pp. 4919-4927, ISSN 13596454, [Online-Edition: http://dx.doi.org/10.1016/j.actamat.2004.06.047],
[Article]

Abstract

A novel liquid crystal display was utilized to monitor electric surface potentials in front of a crack tip in a ferroelectric ferroelastic material, lead zirconate titanate (PZT). The electric potential could be converted to yield the radial stress and strain distribution in front of the crack which afforded determination of the domain switching zone as well as the hardening coefficient. This zone shape as well as its evolution during crack growth was monitored. In contrast to transformation toughening materials, the crack tip process zone size was demonstrated to first increase and then decrease with increasing crack length.

Item Type: Article
Erschienen: 2004
Creators: Kounga Njiwa, Alain Brice and Lupascu, Doru C. and Rödel, Jürgen
Title: Crack tip switching zone in ferroelectric ferroelastic materials
Language: English
Abstract:

A novel liquid crystal display was utilized to monitor electric surface potentials in front of a crack tip in a ferroelectric ferroelastic material, lead zirconate titanate (PZT). The electric potential could be converted to yield the radial stress and strain distribution in front of the crack which afforded determination of the domain switching zone as well as the hardening coefficient. This zone shape as well as its evolution during crack growth was monitored. In contrast to transformation toughening materials, the crack tip process zone size was demonstrated to first increase and then decrease with increasing crack length.

Journal or Publication Title: Acta Materialia
Volume: 52
Number: 16
Uncontrolled Keywords: PZT; Fracture; Process zone
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 18 May 2011 15:19
Official URL: http://dx.doi.org/10.1016/j.actamat.2004.06.047
Identification Number: doi:10.1016/j.actamat.2004.06.047
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