Chapter 8. Free-Roller Versus Fixed-Roller Fixtures in Flexure Testing of Advanced Ceramic Materials

  1. John B. Wachtman Jr.
  1. Sung R. Choi

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314821.ch8

Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3

Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3

How to Cite

Choi, S. R. (1996) Free-Roller Versus Fixed-Roller Fixtures in Flexure Testing of Advanced Ceramic Materials, in Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314821.ch8

Author Information

  1. Cleveland State University, Cleveland, OH 44115; Jonathan A. Salem, NASA Levis Research Center, Cleveland, OH 44135

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1996

ISBN Information

Print ISBN: 9780470375426

Online ISBN: 9780470314821

SEARCH

Keywords:

  • attributed;
  • eliminate errors;
  • fixation;
  • flexural;
  • compression

Summary

The error associated with strength measurements made with fixed-roller and V-grooved roller fixtures was studied with a variety of roller and fixture material combinations. Both the fixed-roller and the V-grooved fixtures yielded an error in stress of about 4 to 7 %. They also exhibited an appreciable amount of load strain hysteresis. Dynamic fatigue testing of % wt % alumina verified the error: the fatigue strength was overestimated by 7 to 9 % for the fixedroller configuration. The source of error is exclusively attributed to friction between the rollers and the specimen surface, as verified by previous investigators.