Chapter 44. Shear Induced Transformation in Enstatite

  1. John B. Wachtman Jr.
  1. D. Zhu and
  2. W. M. Kriven

Published Online: 26 MAR 2008

DOI: 10.1002/9780470314821.ch44

Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3

Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3

How to Cite

Zhu, D. and Kriven, W. M. (1996) Shear Induced Transformation in Enstatite, in Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - A: Ceramic Engineering and Science Proceedings, Volume 17, Issue 3 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314821.ch44

Author Information

  1. Dept. of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 1996

ISBN Information

Print ISBN: 9780470375426

Online ISBN: 9780470314821

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Keywords:

  • transformation;
  • crystallographic;
  • modified;
  • configuration;
  • stabilization

Summary

Shear-induced proto to clino transformation in enstatite is studied using a novel shear-compression experiment. The transformation can be critically induced by shear stress at 96 MPa which is independent of stress state, but sensitive to microstructure. Considerable non-linear stress vs strain behavior is observed in the shear compression test, where the “plasticity” results from transformation and depends on either microstructure or mechanical testing conditions. XRD on fracture surfaces confirms that transformation is induced by shear stress, and indicates that the amount of clinoenstatite produced is a function of stress state. Thus, the more compressive the stress, the higher the ultimate shear stress and the more the amount of transformed clinoenstatite.