Abstract
In this contribution we present a numerical calculation of thermal residual stress distribution within a multilayered system which consists of a Functionally Gradient Material (FGM). The structure of the graded system is made of a ceramic layer and a metallic layer, where between them there is an interlayer which is a graded composite made of the metal (NiCr alloy) and the ceramic (Al 2 O 3 and stabilised ZrO 2 ). For numerical modelling of this graded interlayer, an approximation was done as a series of perfectly bonded finite layers, each having slightly different material properties. We analyse the FGM design in respect to thermal stress optimisation. The effects on residual stress distribution of the compositional profiles and graded interlayer thickness were studied for the case of a bilayer structure and a graded thermal harrier coating (TBC).
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