Abstract
In this study, it was investigated experimentally and analytically that fracture process and fatigue behavior of Thermal Barrier Coatings (TBCs) used in a high temperature component in a land based gas turbine. The eifect of the thermal load on TBCs was investigated measuring residual stress of top coat, finite element method and torsion test. It was found that (1) Delamination of top coat under thermal load is peak of undulation in top coat and bond coat interface. Around the peak, spalling stress is generated. (2) Fracture and fatigue tests based on torsion test were carried out by heading circular cylinder specimen. It was found that mechanical property of bond coat changes after thermal aging and shear fatigue behavior of TBCs was affected bond coat strength.
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