Chapter 26. Fracture Modes in Initially-Cracked Concentric Cylinders

  1. John B. Wachtman Jr.
  1. R. Y. Kim1,
  2. A. S. Crasto1 and
  3. N. J. Pagano2

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314555.ch26

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5

Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5

How to Cite

Kim, R. Y., Crasto, A. S. and Pagano, N. J. (2008) Fracture Modes in Initially-Cracked Concentric Cylinders, in Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B: Ceramic Engineering and Science Proceedings, Volume 15, Issue 5 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314555.ch26

Author Information

  1. 1

    University of Dayton, Dayton, OH 45469

  2. 2

    U.S. Air Force Wright Laboratory, Dayton, OH 45433

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1994

ISBN Information

Print ISBN: 9780470375334

Online ISBN: 9780470314555

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Keywords:

  • failure modes;
  • brittle-matrix composite;
  • crack penetration;
  • fiber-matrix interface;
  • cylindrical wood rod

Summary

An experimental study was conducted to demonstrate failure modes in brittle-matrix composites and validate the predictions of an analytical model by the use of a model composite specimen. Two failure modes, crack penetration into the fiber and crack deflection at the fiber-matrix interface are considered in this paper. The specimen consists of a cylindrical wood rod (representing the fiber) in a concentric cylinder of epoxy matrix which has an annular surface crack. The fiber-matrix interface bond strength was varied by applying a release agent to the surface of the reinforcing rod. The experimental technique including characterization of the constituents and detection of the sequence of failure events is described. The intended failure modes were experimentally demonstrated and their quantitative prediction was attempted assuming that failure was governed by the maximum values of the stresses as a first approximation.