25. Fracture Strength Simulation of SiC Microtensile Specimens—Accounting for Stochastic Variables

  1. Manuel E. Brito,
  2. Peter Filip,
  3. Charles Lewinsohn,
  4. Ali Sayir,
  5. Mark Opeka and
  6. William M. Mullins
  1. Noel N. Nemeth1,
  2. Osama M. Jadaan2,
  3. George D. Quinn3,
  4. Mark A. Trapp4,
  5. Glenn M. Beheim5,
  6. William N. Sharpe6 and
  7. Laura J. Evans7

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291283.ch25

Developments in Advanced Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 8

Developments in Advanced Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 8

How to Cite

Nemeth, N. N., Jadaan, O. M., Quinn, G. D., Trapp, M. A., Beheim, G. M., Sharpe, W. N. and Evans, L. J. (2005) Fracture Strength Simulation of SiC Microtensile Specimens—Accounting for Stochastic Variables, in Developments in Advanced Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 8 (eds M. E. Brito, P. Filip, C. Lewinsohn, A. Sayir, M. Opeka and W. M. Mullins), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291283.ch25

Author Information

  1. 1

    NASA Glenn Research Center 21000 Brookpark Rd. Cleveland, OH, 44135

  2. 2

    University of Wisconsin—Platteville Platteville, WI, 53818

  3. 3

    NIST 100 Bureau Dr. Gaithersburg, MD, 20899

  4. 4

    Carnegie Mellon University 5000 Forbes Ave. Pittsburgh, PA, 15213

  5. 5

    NASA Glenn Research Center 21000 Brookpark Rd. Cleveland, OH, 44135

  6. 6

    The Johns Hopkins University 3400 North Charles St. Baltimore, MD, 21218

  7. 7

    NASA Glenn Research Center 21000 Brookpark Rd. Cleveland, OH, 44135

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2005

ISBN Information

Print ISBN: 9781574982619

Online ISBN: 9780470291283

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Keywords:

  • ceramics;
  • continuum;
  • polycrystalline;
  • turbomachinery;
  • geometrical

Summary

This paper summarizes work performed to predict the room-temperature strength of SiC micro-scale tensile specimens with introduced stress concentration using NASA Glenn Research Center's Ceramics Analysis and Reliability Evaluation of Structures Life prediction program (CARES/Life). A polycrystalline and a single crystal SiC material were tested. CARES/Life tended to over predict strength of the polycrystalline material but had relatively better success predicting the strength response for the single crystal material. Large columnar grains and rough side-walls for the polycrystalline material likely reduced the applicability of continuum analysis and therefore the accuracy of the CARES/Life analysis. The single crystal material did not have (or had less of) these complications. Significant specimen-to-specimen dimensional variation existed in the specimens. To simulate the additional effect of the dimensional variability on the probabilistic strength response for the single crystal specimens the ANSYS Probabilistic Design System (PDS) was used with CARES/Life. The ANSYS/PDS—CARES/Life simulation was not rigorous. Isotropic material and fracture behavior was assumed in the analysis. However the feasibility of using these programs to account for multiple stochastic variables on the strength response of a structure was demonstrated.