3. Model of Deviation of Cracks at Interfaces or Within Interphases
- Edgar Lara-Curzio
Published Online: 26 MAR 2008
Copyright © 2005 The American Ceramics Society
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
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 2005
Print ISBN: 9781574982329
Online ISBN: 9780470291221
- crack deflection;
- stress components;
- mechanical properties;
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.