Chapter 1. High-Velocity Impact Resistance of ZrB2-SiC

  1. Rajan Tandon,
  2. Andrew Wereszczak and
  3. Edgar Lara-Curzio
  1. Stewart Henderson1,
  2. William G. Fahrenholtz1,
  3. Gregory E. Hilmas1 and
  4. Jochen Marschall2

Published Online: 27 MAR 2008

DOI: 10.1002/9780470291313.ch1

Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2

Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2

How to Cite

Henderson, S., Fahrenholtz, W. G., Hilmas, G. E. and Marschall, J. (2006) High-Velocity Impact Resistance of ZrB2-SiC, in Mechanical Properties and Performance of Engineering Ceramics II: Ceramic Engineering and Science Proceedings, Volume 27, Issue 2 (eds R. Tandon, A. Wereszczak and E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291313.ch1

Author Information

  1. 1

    Department of Materials Science and Engineering University of Missouri–Rolla Rolla, MO 65409

  2. 2

    Molecular Physics Laboratory SRI International Menlo Park, CA 94025

Publication History

  1. Published Online: 27 MAR 2008
  2. Published Print: 1 JAN 2006

ISBN Information

Print ISBN: 9780470080528

Online ISBN: 9780470291313

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Keywords:

  • high-velocity;
  • resistance;
  • silicon carbide;
  • degradation;
  • zirconium and hafnium diborides

Summary

The high–velocity impact resistance of hot–pressed zirconum diboride with 30 volume percent silicon carbide was studied using a combined experimental and computational approach. Test specimens in the form of 2 mm thick polished disks were impacted with ∼0.8 mm diameter tungsten carbide spheres at velocities up to 320 m/s. The intrinsic flexure strength of the specimens was ∼1000 MPa. The flexure strength retained by impacted specimens decreased linearly with increasing impact velocity, falling to ∼600 MPa at ∼290 m/s. Above this threshold velocity, the retained flexure strength fell rapidly, with no measurable retained strength for samples impacted at 320 m/s. The experimental results suggest gradual strength degradation is associated with the formation of shear and sliding faults under the impact zone at moderate impact velocities. The abrupt decrease in strength above 290 m/s is due to cone–crack propagation. Finite element modeling supports the failure mechanism for impact velocities above 290 m/s, but fails to provide insight as to the failure mechanism below this velocity.