Chapter 17. Prediction of the Failure Probability of High Strength Ceramics Subject to Thermal Shock Loading

  1. Hua-Tay Lin and
  2. Mrityunjay Singh
  1. A. Brückner-Foit1,
  2. E. Diegele2,
  3. P. Hülsmeier3,
  4. U. Rettig4 and
  5. C. Hohmann5

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294741.ch17

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

Brückner-Foit, A., Diegele, E., Hülsmeier, P., Rettig, U. and Hohmann, C. (2002) Prediction of the Failure Probability of High Strength Ceramics Subject to Thermal Shock Loading, 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.ch17

Author Information

  1. 1

    Kassel University Mönchebergstr. 3 D 34109 Kassel, Germany

  2. 2

    Forschungszentrum Karlsruhe P.O. Box 3640 D 76021 Karlsruhe, Germany

  3. 3

    Karlsruhe University P.O. Box 3640 D 76021 Karlsruhe, Germany

  4. 4

    SIEMENS CT MM2 Otto-Hahn-Ring 6 D 81730 München, Germany

  5. 5

    SIEMENS Power Generation Wiesenstr. 35 D 45473 Mülheim, Germany

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:

  • monolithic ceramics;
  • thermo-mechanical analyses;
  • fracture mechanics;
  • optical methods;
  • probability

Summary

Failure of monolithic ceramics can be predicted using the Weibull theory. From the point of view of experimental verification the theory is well established for multi-axial mechanical loading as well as fatigue loading at constant temperatures. In view of high temperature applications failure due to thermal creep and sub-critical crack growth is also included within several commercial available design tools for ceramic components. However, these tools are not verified to reliably predict failure caused by special loading conditions under thermal excursions such as thermal shock conditions or off-normal overloads, where components like gas turbines are locally loaded by steep temperature gradients and steep stress gradients within a short time span.

A thermal shock experiment was performed in order to verify the Weibull theory in a case with a rather involved load history. Notched rectangular bars were heated up to constant temperature of 1450d̀C and subsequently exposed to a rapid cooling. The results of thermo-mechanical analyses using FEM served as an input file for the STAU code which allows in post-processing to predict the failure probability. The predicted failure probability agreed very well with the findings of the experiment provided that the pronounced stress gradient in the notch root were correctly taken into consideration.