An arbitrarily oriented crack problem for a functionally graded coating-substrate structure

Abstract eng:
Functionally graded materials (FGMs) are typical nonhomogeneous materials which have been used significantly in many engineering fields. Functionally graded coating-substrate structure attracts great attention because of its excellent properties for extreme working conditions. Currently most analytical models of crack problem for functionally graded coating-substrate structure focus on situations that the crack is parallel or perpendicular to the gradient direction [1]. The work of this dissertation provides an analytical model for a functionally graded coating-substrate structure with general properties and an arbitrarily oriented crack in the coating. In this model ... described by a general piecewise-exponential model (GPE model) while the substrate layer is homogeneous. The mixed-mode crack problem is turned into solving a group of singular integral equations after which mixed-mode stress intensity factors (SIFs) can be obtained.

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