13. Compression Testing and Response of SiC-N Ceramics: Intact, Damaged and Powder

  1. Jeffrey J. Swab
  1. Kathryn A. Dannemann,
  2. Arthur E. Nicholls,
  3. Sidney Chocron,
  4. James D. Walker and
  5. Charles E. Anderson Jr.

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291276.ch13

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

Dannemann, K. A., Nicholls, A. E., Chocron, S., Walker, J. D. and Anderson, C. E. (2008) Compression Testing and Response of SiC-N Ceramics: Intact, Damaged and Powder, 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.ch13

Author Information

  1. Southwest Research Institute P.O. Drawer 28510 San Antonio, Texas 78228–0510

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:

  • pre damaged samples;
  • chocron;
  • hoop strain;
  • powder ceramic materials;
  • existing models

Summary

The objective of this work was to determine the fundamental compression response of SiC-N ceramics and obtain an improved understanding of the transition from intact to damaged material to aid in ceramics modeling efforts. Existing models 1,2 for evaluating the performance of ceramics under ballistic impact do not adequately address this behavior owing to the lack of experimental data in this regime. Compression experiments were conducted on SiC-N material in various forms: intact, damaged, and powder. A technique was developed for obtaining “comminuted” SiC-N material from intact material by in-situ failure of pre-damaged samples. A thermal shock procedure was devised to pre-damage the SiC-N material. The pre-damaged samples were inserted in a high-strength steel confining sleeve, and then loaded and re-loaded at quasistatic strain rates to fail the material in-situ. Several load/reload cycles were conducted at successively increasing loads. Strain gages mounted on the outer diameter of the confinement sleeve allowed the measurement of hoop strain. A high-strength steel confining ring was also used for testing SiC-N powder. The powder samples were compacted to approximately 50% of theoretical density prior to testing. The experimental findings are presented for the three material forms. The “comminuted” material exhibited a decline in performance versus the intact material. The results are compared and discussed in light of existing damage models. Numerical and analytical modeling of the experiments for damaged and powder materials was performed to enhance understanding; the modeling results are presented in another paper by Chocron, et al.3 at this conference.