Crack Behaviour in Laminar Ceramics with Strong Interfaces

Abstract:

The paper deals with crack propagation in ceramic laminates. Assumptions of linear elastic fracture mechanics and small scale yielding are considered. Crack behaviour in a ceramic laminate body under external loading is investigated. Strong residual stresses due to different coefficients of thermal expansion of individual material layers are taken into account in finite element calculations. The change of crack propagation direction at the material interface is estimated on the base of the strain energy density factor and maximum tangential stress criteria. The influence of thickness of laminate layers on crack propagation direction is estimated. The stepwise crack propagation through the Al2O3-ZrO2 ceramic laminate is numerically estimated. It can be concluded that good agreement between the estimated crack path and experimental data was found.

• Periodical: Key Engineering Materials (Volumes 417-418)
• Pages: 301-304
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.417-418.301
• Online since: October 2009
• Authors: Luboš Náhlík, Lucie Šestáková, Pavel Hutař
• Keywords: Ceramic Laminate, Crack Propagation Direction, Flaw Tolerant Ceramic, Residual Stress

References

[1] R. Bermejo, Y. Torres, C. Baudín, A.J. Sánchez-Herencia, J. Pascual, M. Anglada and L. Llanes: Journal of the European Ceramic Society 27 (2007), pp.1443-1448.

DOI: 10.1016/j.jeurceramsoc.2006.05.037

[2] R. Bermejo, L. Llanes, M. Anglada, P. Supancic and T. Lube: Key Engineering Materials 290 (2005), pp.191-198.

[3] F. Erdogan and G.C. Sih: Journal of Basic Engineering, 85D(4) (1963), pp.519-527.

[4] G.C. Sih: Mechanics of fracture I. Methods of analysis and solutions of crack problems (Noordhoff International Publishing, Leyden 1973).

[5] L. Šestáková, L. Náhlík, P. Hutař and Z. Knésl: accepted for publication in Proceedings of International Conference on Fracture (ICF-12), Ottawa, (2009).