Abstract
The edge interfacial delamination mechanisms for a system comprising of a metallic substrate (316 L stainless steel), stepwise functionally graded (FG) interlayer (316 L stainless steel and alumina) and top coat (silicon carbide (SiC)) were studied for the first time utilizing an axisymmetric cylindrical model and interfacial failure criteria. Finite element analysis was used for this investigation with the assumptions of ideal bonding between layers and an initial stress-free temperature from which the model was cooled down (as might be achieved from plasma spray coating). The influence of graded interlayer composition factor on delamination behaviour of the two system interfaces was investigated using four separate interfacial failure criteria. The SiC top coat thickness was then considered and studied as another critical parameter in the system. Finally, a novel delamination failure map was obtained for the studied system with a FG layer based on interfacial fracture toughness ratios as a function of SiC thickness and composition factor. It was shown using this map that delamination in a multilayer system comprising a FG interlayer and top coat can be controlled by modifying the FG interlayer composition factor and thickness of the top coat.
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