2134/33597
Christopher Harvey
Christopher
Harvey
Simon Wang
Simon
Wang
Bo Yuan
Bo
Yuan
Rachel Thomson
Rachel
Thomson
Gary Critchlow
Gary
Critchlow
On spallation of EB-PVD thermal barrier coatings on turbine blades
Loughborough University
2018
Composite materials
Interface fracture
Pockets of energy concentration
Spallation
Thermal barrier coatings
Materials Engineering not elsewhere classified
2018-06-28 10:52:47
Conference contribution
https://repository.lboro.ac.uk/articles/conference_contribution/On_spallation_of_EB-PVD_thermal_barrier_coatings_on_turbine_blades/9220691
Room temperature blistering and spallation failures reduce the life time of thermal barrier coatings (TBC). Based on the theory of pockets of energy concentration, a mechanical model for the multilayer circular blister is presented, considering the variable material properties through the coating thickness. Con-ditions are revealed analytically for nucleation, propagation and the spallation of TBC blisters. The predictions from the mechanical model on radii for TBC blister unstable growth and spallation are in good agreement with experimental results. Furthermore, this model is beneficial to determine the interface fracture tough-ness and the residual stress in the coating system.