Journal
THEORETICAL AND APPLIED MECHANICS LETTERS
Volume 8, Issue 1, Pages 7-11Publisher
ELSEVIER
DOI: 10.1016/j.taml.2018.01.007
Keywords
Thermal barrier coating; Interface fracture; Spallation; Pockets of energy concentration; Buckling
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Laboratory experiments were conducted to study the spallation behaviour of thermal barrier coatings (TBCs) on aero-engine turbine blades manufactured by the electron-beam physical vapour deposition technique (EB-PVD). Intact blades were heated at temperature 1135 degrees C in a furnace for certain time and then cooled to the room temperature in the laboratory condition. It was found that no spallation occurred during cooling, but spallation happened at constant room temperature after cooling. The spallation mechanism is studied by using the mechanical model developed (Harvey 2017 and Wang 2017), which are based on the hypothesis of pockets of energy concentration (PECs). Some observations of the spallation behaviour are well predicted by the model. (C) 2018 The Authors. Published by Elsevier Ltd on behalf of The Chinese Society of Theoretical and Applied Mechanics.
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