Chapter 62. Hertzian Indentation Damage in Alumina with R-Curve Behavior

  1. John B. Wachtman Jr
  1. Sujanto Widjaja,
  2. Karl Jakus and
  3. John E. Ritter

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314715.ch62

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4

Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4

How to Cite

Widjaja, S., Jakus, K. and Ritter, J. E. (2008) Hertzian Indentation Damage in Alumina with R-Curve Behavior, in Proceedings of the 19th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 16, Issue 4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314715.ch62

Author Information

  1. Department of Mechanical Engineering, University of Massachusetts Amherst, Massachusetts 01003

Publication History

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

ISBN Information

Print ISBN: 9780470375372

Online ISBN: 9780470314715

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Keywords:

  • R-curve;
  • post-indentation;
  • disc-shaped;
  • indentation;
  • ceramics

Summary

The effect of R-Curve behavior on the post-indentation strength of a large-grained, 99.5% purity alumina with R-Curve behavior was studied using Hertzian indentation. Disc-shaped specimens were indented with a spherical indenter with increasing indentation loads. Post-indentation strength was measured in mineral oil using a ring-on-ring biaxial fixture. Indentation produced typical Hertzian crack pattern with somewhat greater statistical variation than what is found in glass. The strength results fell into four different regions that were separated by the onset of ring, cone and radial crack formation, respectively. R-Curve did not have a clearly demarcated influence on the results, perhaps, due to the relatively narrow range of indentation loads where failure was controlled by ring and cone cracks. The strength results are compared to the post-indentation strength of soda-lime glass and an alumina without R-Curve behavior.