THERMAL SCIENCE

International Scientific Journal

INTERFACIAL CRACK BEHAVIOR IN THE STATIONARY TEMPERATURE FIELD CONDITIONS

ABSTRACT
The brittle coatings, made of different materials, when subjected to elevated temperatures and in the heat exchange conditions, are susceptible to delamination. Those coatings, as well as thin films, can be used for various thermo insulating deposits, e.g. in turbines of thermal power plants., In layers made of different materials, due to the environmental temperature change, thermal stresses appear as a consequence of a difference in their thermal expansion coefficients. In this paper driving forces were analyzed causing delamination of one layer from the other, i.e. the interfacial fracture in the two-layered, bimaterial sample. This analysis was limited to considering the sample behavior when exposed to the stationary temperature field. The energy release rate G, which is the driving force for this interfacial fracture, is changing with temperature and that variation is increasing with increase of the temperature difference between the environment and the sample. Analysis of this relation can be used to predict the maximal temperature difference, which the two-layered sample can be subjected to, without appearance of delamination between layers.
KEYWORDS
PAPER SUBMITTED: 2012-08-28
PAPER REVISED: 2013-04-10
PAPER ACCEPTED: 2013-08-04
PUBLISHED ONLINE: 2013-08-17
DOI REFERENCE: https://doi.org/10.2298/TSCI120828113D
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2014, VOLUME 18, ISSUE Supplement 1, PAGES [S169 - S178]
REFERENCES
  1. Evans, A.G. and Hutchinson, J. W. (1995), The thermo mechanical integrity of thin film and multilayers, Acta Metallica et Materialia, 43, 7, pp. 2507-2530.
  2. Evans, A. G. and Hutchinson, J. W. (2007), The mechanics of coating delamination in thermal gradients, Surface and Coatings Technology, 201, 18, pp. 7905-7916.
  3. Marsavina, l., Tomlinson, R. A. (2004), Thermoelastic Stress Analysis for Structural Integrity Assessment, Structural Integrity and Life, Vol. 4, No. 3, pp. 109-115.
  4. Sedmak, A., H. A. Anyiam, H. A. (2001), Structural Integrity Assessment Using Fracture Mechanics, Structural Integrity and Life, Vol. 1, No. 2, pp. 67-73.
  5. Agatonović, P. (2001), Different Strategies for Evaluation Remaining Strength and Life, Structural Integrity and Life, Vol. 1, No. 2, pp. 75-89.
  6. Hutchinson, J. W. and Evans, A. G. (2002), On the delamination of thermal barrier coatings in thermal gradients, Surface and Coatings Technology, 149, 2-3, pp. 179-184.
  7. Xue, Z., Evans, A. G., Hutchinson, J.W. (2009), Delamination Susceptibility of coatings under high thermal flux, Journal of Applied Mechanics, 76, , 4, pp. 1-7.
  8. Rice, J. R. (1988), Elastic fracture mechanics concepts for interfacial cracks, Journal of Applied Mechanics, 55, 1, pp. 98 - 103.
  9. Hutchinson, J. W. and Suo Z., (1992) Mixed mode cracking in layered materials, Advances in Applied Mechanics, 29, pp. 63-191.
  10. Veljkovic J. M., Nikolic, R.R. (2003), Application of the interface crack concept to the problem of a crack between a thin layer and a substrate, Facta Universitates, Vol. 3, pp. 573-581.
  11. Djokovic, J. M., Nikolic, R. R., Tadic, S. S. (2010), Influence of temperature on behavior of the interfacial crack between the two layers, Thermal Science, 14, pp. S259-S268.
  12. Djokovic, J. M., Nikolic, R. R., "Behavior of an interfacial crack between the two layers in the stationary temperature field conditions", Proceedings of "First International Conference on Damage Mechanics", Belgrade, Serbia, 25 - 27 June 2012, pp. 105-108, ISBN 978-86-86115-09-6.

© 2019 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence