15. Effects of Porosity Distribution on the Dynamic Behavior of SiC

  1. Jeffrey J. Swab
  1. Samuel R. Martin1 and
  2. Min Zhou2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291276.ch15

Advances in Ceramic Armor: A Collection of Papers Presented at the 29th International Conference on Advanced Ceramics and Composites, January 23-28, 2005, Cocoa Beach, Florida, Ceramic Engineering and Science Proceedings, Volume 26, Number 7

Advances in Ceramic Armor: A Collection of Papers Presented at the 29th International Conference on Advanced Ceramics and Composites, January 23-28, 2005, Cocoa Beach, Florida, Ceramic Engineering and Science Proceedings, Volume 26, Number 7

How to Cite

Martin, S. R. and Zhou, M. (2005) Effects of Porosity Distribution on the Dynamic Behavior of SiC, in Advances in Ceramic Armor: A Collection of Papers Presented at the 29th International Conference on Advanced Ceramics and Composites, January 23-28, 2005, Cocoa Beach, Florida, Ceramic Engineering and Science Proceedings, Volume 26, Number 7 (ed J. J. Swab), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291276.ch15

Author Information

  1. 1

    US Army Research Laboratory AMSRD-ARL-WM-TA APG.MD 21005

  2. 2

    G.W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta, GA 30332–0405

Publication History

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

ISBN Information

Print ISBN: 9781574982374

Online ISBN: 9780470291276

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Keywords:

  • regular hexoloy;
  • enhanced hexoloy;
  • hugoniot elastic limit;
  • microstructure drastically;
  • material properties

Summary

In order to understand the microstructural reasons behind variations in ballistic performances, plate impact tests were conducted on two sintered silicon carbides with slightly different microstructures. The materials are referred to as Regular Hexoloy (RH) and Enhanced Hexoloy (EH) here. The porosity distribution in the EH samples had fewer large pores, leading to an 18% increase in flexural strength over that for RH samples. Plate impact experiments were conducted utilizing a VISAR to measure free surface velocities. The Hugoniot Elastic Limit (HEL) and spall strength for each material were determined. The spall strength was measured as a function of impact stress and pulse duration. Results show that the difference in porosity distribution between the EH and RH samples leads to no discernable difference in their HEL values and spall strengths. Both materials demonstrated finite spall strengths under loading above the HEL. Furthermore, the spall strengths were independent of the pulse width and showed a trend similar to that found in other studies on SiC.