Abstract

Thermal Barrier Coating (TBC) systems are exposed to thermomechanical and oxidative loading. The residual stress fields induced by the thermal expansion mismatch and oxidation of the Bond Coat (BC) in the coating system are widely investigated using experimental and numerical methods. Based on the evaluation of the calculated residual stress fields and the experimental observations of the cracking behavior, cracks are modeled in the TBC in the vicinity of the TBC/Thermally Grown Oxide (TGO) interface, in the TGO, and at the TGO/BC interface. In this work, results of the fracture mechanics assessment of the implemented cracks are presented. The modified crack closure integral method is used for postprocessing the finite element results to determine the mode-dependent energy release rate components. The crack propagation capability and crack propagation direction can then be predicted using failure criteria and critical material data in addition to the crack assessment results. Applying this technique, different failure mechanisms of the TBC systems are investigated. A lifetime prediction based on the determination of a critical TGO thickness is Derformed.

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