13. The Role of Cyclic Mechanical Loading and Thermal Gradients in Damage Behavior of Thermal Barrier Coating Systems

  1. Dongming Zhu and
  2. Kevin Plucknett
  1. Marion Bartsch1,
  2. Bemd Baufeld1,
  3. Serdar Dalkriliç2 and
  4. Michael Heinzelmann3

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291238.ch13

Advances in Ceramic Coatings and Ceramic-Metal Systems: Ceramic Engineering and Science Proceedings, Volume 26, Number 3

Advances in Ceramic Coatings and Ceramic-Metal Systems: Ceramic Engineering and Science Proceedings, Volume 26, Number 3

How to Cite

Bartsch, M., Baufeld, B., Dalkriliç, S. and Heinzelmann, M. (2005) The Role of Cyclic Mechanical Loading and Thermal Gradients in Damage Behavior of Thermal Barrier Coating Systems, in Advances in Ceramic Coatings and Ceramic-Metal Systems: Ceramic Engineering and Science Proceedings, Volume 26, Number 3 (eds D. Zhu and K. Plucknett), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291238.ch13

Author Information

  1. 1

    German Aerospace Center, DLR Linder Hoehe D-51147 Cologne, Germany

  2. 2

    Anadolu University, College of Civil Aviation, 26470 Eskişehir, Turkey

  3. 3

    University of Applied Sciences Bonn-Rhein-Sieg, D-53359 Rheinbach, Germany

Publication History

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

ISBN Information

Print ISBN: 9781574982336

Online ISBN: 9780470291238

SEARCH

Keywords:

  • isothermal;
  • components;
  • ceramic;
  • atmosphere;
  • perpendicular

Summary

Ceramic thermal barrier coatings (TBC) can exhibit premature in-service failure due to spallation as a consequence of exposure to elevated temperatures, aggressive environments, and cyclic thermal and mechanical loading. In this study, the influence of cyclic mechanical loading and thermal gradients on the damage mechanisms in TBC systems is investigated. Performed tests were thermal fatigue with superimposed mechanical fatigue load and thermal gradient over the cross section as well as isothermal mechanical fatigue at high temperature. The stress states generated by mechanical loading and thermal gradients in the course of the respective test cycle were analyzed by Finite Element calculations. The calculated stress distributions were used to discuss specific damage patterns observed for the different test types. In the case of thermal gradient mechanical fatigue tests, which generate stresses most closely to in-service conditions of rotating gas turbine blades, the observed evolution of cracks parallel to the coating surface can explain accelerated TBC spallation.