Chapter 15. Experimental Errors in Modulus of Rupture Test Fixtures

  1. John B. Wachtman Jr.
  1. L. R. Swank,
  2. J. C. Caverly and
  3. R. L. Allor

Published Online: 26 MAR 2008

DOI: 10.1002/9780470313053.ch15

14th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 9/10

14th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 9/10

How to Cite

Swank, L. R., Caverly, J. C. and Allor, R. L. (1990) Experimental Errors in Modulus of Rupture Test Fixtures, in 14th Annual Conference on Composites and Advanced Ceramic Materials, Part 2 of 2: Ceramic Engineering and Science Proceedings, Volume 11, Issue 9/10 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470313053.ch15

Author Information

  1. Research Staff, Ford Motor Company, Dearborn, MI 48121

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1990

ISBN Information

Print ISBN: 9780470374931

Online ISBN: 9780470313053

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Keywords:

  • ceramic;
  • prismatic;
  • geometry;
  • equilibrium;
  • hexagons

Summary

Modulus of rupture test fixtures used for testing structural ceramic materials in flexure have inherent errors which are reflected in a difference between the outer fiber stress calculated from simple beam formulas and the true outer fiber stress existing in the beam. Since flexural testing is the principal method used to determine the stress rupture and fast fracture properties of structural ceramic materials, determination of these errors is important. The errors in several types of fixture designs and two different beam geometries were investigated using straingauged beams to measure the true strain in the beam within strain-gauge accuracy. A fixture was designed and developed utilizing roller supports to minimize errors.