Chapter 10. A Comparison of Fracture Mechanism Maps with the Larson-Miller Method of Predicting Lifetime

  1. John B. Wachtman Jr.
  1. S. M. Wiederhorn,
  2. J. D. French and
  3. W. E. Luecke

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314784.ch10

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5

How to Cite

Wiederhorn, S. M., French, J. D. and Luecke, W. E. (1995) A Comparison of Fracture Mechanism Maps with the Larson-Miller Method of Predicting Lifetime, in Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 16, Issue 5 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314784.ch10

Author Information

  1. National Institute of Standards and Technology Gaithersburg, MD 20899

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1995

ISBN Information

Print ISBN: 9780470375389

Online ISBN: 9780470314784

SEARCH

Keywords:

  • evaluated;
  • melting points;
  • castables;
  • resistance;
  • oxidized

Summary

Two general methods of determining structural reliability at high temperatures are compared. The direct method uses models of the underlying rupture behavior to delineate different regions of behavior. These regions can be displayed on a fracture-mechanism map, a plot of allowable stress as a function of temperature with contours of constant lifetime. The Larson-Miller method uses an empirical representation of the rupture behavior to reduce the observed rupture stress-temperature conditions to a single “master curve.” Central prediction lines and prediction limits determined for both methods yield equivalent predictions of the lifetime, but only after the Larson-Miller data are fit using a piecewise linear representation of the data.