Fatigue life prediction of a plasma sprayed thermal barrier coating system
(English)Manuscript (preprint) (Other academic)
Thermal barrier coatings are commonly used in gas turbines for power generation. One major issue in TBC design is how to determine fatigue life in these material systems. The present paper aims at presenting a model for determination of TBC life based on the behavior of an air plasma sprayed coating system. This is done by analysis of fracture behavior and evaluation of data from thermal fatigue tests. The knowledge regarding fracture behavior in thermal fatigue tests is used as an input to the modelling work. For formulation of the fatigue life model, a Paris law approach has been used. FE calculations are used to obtain energy release rate and stress intensity factors, KI and KII, for a propagating delamination crack in the top/ bond coat interface. As a measure of failure, a delamination damage measure is used. A method for determination of delamination crack growth data is presented.
Thermal barrier coating, delamination, fatigue, fracture mechanics, modelling, crack growth
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-24277Local ID: 3886OAI: oai:DiVA.org:liu-24277DiVA: diva2:244594