3. Model of Deviation of Cracks at Interfaces or Within Interphases

  1. Edgar Lara-Curzio
  1. J. Lamon and
  2. S. Pompidou

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291221.ch3

Mechanical Properties and Performance of Engineering Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 2

Mechanical Properties and Performance of Engineering Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 2

How to Cite

Lamon, J. and Pompidou, S. (2005) Model of Deviation of Cracks at Interfaces or Within Interphases, in Mechanical Properties and Performance of Engineering Ceramics and Composites: Ceramic Engineering and Science Proceedings, Volume 26, Number 2 (ed E. Lara-Curzio), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291221.ch3

Author Information

  1. Laboratoire des Composites Thermo Structuraux UMR 5801: CNRS-Snecma-CEA-UB1 Domaine Universitaire 3, allée de la Boétie 33600 Pessac France

Publication History

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

ISBN Information

Print ISBN: 9781574982329

Online ISBN: 9780470291221

SEARCH

Keywords:

  • crack deflection;
  • stress components;
  • mechanical properties;
  • pyrocarbon;
  • debonding

Summary

An approach to crack deflection at interfaces or within interphases is proposed on the basis of the Cook and Gordon's mechanism1: a crack is nucleated along an interface, ahead of a propagating crack; deflection of this crack then results from coalescence with the interfacial crack.

The stress state induced by a crack was computed in a cell of bimaterial using the finite element method. The cell represents a matrix and a fiber, or an interphase and a fiber or two layers in a multilayered matrix. A master curve was established. It is based on a debonding depending on strengths and elastic moduli of constituents. The master curve allows deflection of cracks to be predicted with respect to constituent properties. It was used to evaluate the strength of various fiber/matrix interfaces and interphases in ceramic matrix composites. It is discussed with respect to experimental data and crack observations.