Chapter 7. Instrumented Hertzian Indentation of Armor Ceramics

  1. Hua-Tay Lin and
  2. Mrityunjay Singh
  1. A. A. Wereszczak and
  2. R. H. Kraft

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294741.ch7

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3

26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3

How to Cite

Wereszczak, A. A. and Kraft, R. H. (2002) Instrumented Hertzian Indentation of Armor Ceramics, in 26th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 23, Issue 3 (eds H.-T. Lin and M. Singh), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294741.ch7

Author Information

  1. U. S. Army Research Laboratory Metals and Ceramics Research Branch Aberdeen Proving Ground, MD 21005

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2002

ISBN Information

Print ISBN: 9780470375785

Online ISBN: 9780470294741

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Keywords:

  • parameters;
  • utilization;
  • indentation testing;
  • quasi-plasticity;
  • ceramic armor

Summary

There is commonality between the resulting damage in ballistically tested ceramics and Hertzian indentation. In an effort to study the parameters associated with the damage from the latter, a new-instrumented indentation test system was fabricated to facilitate the evaluation of (typically very hard) candidate armor ceramics. The indentation results from the testing with this system indicate that the utilization of: a diamond indenter; ultra high-resolution displacement measurement; a controlled loading/unloading waveform; and a simple mechanical analog model can be used in combination to quantify quasi-plastic yield and ring-crack initiation stresses that may be subsequently used to generate a plasticity-fracture map all with a single indent. A description of the test system and the indentation testing and evaluation of a hot-pressed SiC are presented.