Chapter 91. Fracture Strength and Crack Growth in Tubular Perovskite Membranes

  1. Hua-Tay Lin and
  2. Mrityunjay Singh
  1. N. Nagendra and
  2. S. Bandhopadhyay

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294741.ch91

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3

How to Cite

Nagendra, N. and Bandhopadhyay, S. (2008) Fracture Strength and Crack Growth in Tubular Perovskite Membranes, in 26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3 (eds H.-T. Lin and M. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294741.ch91

Author Information

  1. School of Mineral Engineering University of Alaska, Fairbanks AK 99775–5800, USA

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2002

ISBN Information

Print ISBN: 9780470375785

Online ISBN: 9780470294741

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Keywords:

  • tubular perovskite;
  • intergranular;
  • transgranular;
  • C-ring specimen;
  • appreciable

Summary

Fracture strength of tubular perovskite membranes was determined in three different atmospheric conditions: room temperature in air, at 1000d̀C in N2 and at 1000d̀C in CO2/CO gas mixtures. The strength of the membrane decreased with temperature and severity of reducing conditions although the strength distribution (Weibull parameter, m) was relatively unaltered. Surface and volume flaws dominated the fracture origins and the overall fracture was purely transgranular. Crack growth studies with Vickers indents as pre-starter flaws however, indicated a mixture of intergranular and transgranular fracture. The change in fracture mode provides useful insight on the microscopic-events controlling the strength and fracture in perovskite exposed to reducing environments.