Chapter 51. Multiaxial Internal Variable Modeling of the Creep Deformation and Fracture of an Advanced Silicon Nitride

  1. J. P. Singh
  1. R. M. Hazime and
  2. C. S. White

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294437.ch51

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3

How to Cite

Hazime, R. M. and White, C. S. (1997) Multiaxial Internal Variable Modeling of the Creep Deformation and Fracture of an Advanced Silicon Nitride, in Proceedings of the 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 18, Issue 3 (ed J. P. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294437.ch51

Author Information

  1. Northeastern University Dept. of Mechanical and Manufacturing Engineering

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1997

ISBN Information

Print ISBN: 9780470375495

Online ISBN: 9780470294437

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Keywords:

  • silicon nitride;
  • creep behavior;
  • high temperature deformation;
  • heat treatment;
  • grain boundaries

Summary

A three dimensional model for high temperature deformation and failure of an advanced silicon nitride, NT-154, is presented. The model uses a nonsymmetric flow surface to account for different creep behavior in tension and compression. An isotropic strain hardening variable is used to describe the continuous drop in creep rates with deformation. The failure criteria uses a second order symmetric tensor as an internal damage variable to describe the anisotropy of cavity formation under creep conditions. A one dimensional version of the model is compared with experimental creep tests at various stresses and temperatures. The model captures the deformation and failure well to within the scatter in experimental data.