This work describes the application of two-dimensional finite element models with a cohesive zone to study quasi-static crack extension in functionally graded Yttria stabilized Zirconia (YSZ)-Bond Coat (BC) alloy (NiCoCrAlY) thermal barrier coatings (TBC). Crack growth under a single heating-cooling cycle simulating a laser thermal shock experiment is considered. The traction-separation relations for YSZ and BC alloy are coupled to yield a traction-separation relation for the individual layers of the graded TBC. Results from laser thermal shock experiments are then used for a systematic evaluation of the material properties in this traction-separation relation. The effective work of separation for YSZ-BC alloy composites, which is indicative of the material’s fracture toughness, is then computed. The model is then used to predict the surface thermal fracture response in a graded TBC having an architecture different from the coatings that were used to evaluate the cohesive properties. These model predictions are then compared with results from laser thermal shock experiments.
Issue Section:
Technical Papers
Keywords:
thermal barrier coatings,
functionally graded materials,
yttrium compounds,
zirconium compounds,
nickel alloys,
cobalt alloys,
chromium alloys,
aluminium alloys,
yttrium alloys,
thermal shock,
thermal stress cracking,
finite element analysis,
fracture toughness,
surface cracks,
ceramics,
composite materials
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