In this paper, the flutter behaviour of simply supported square functionallygraded material plates immersed in a supersonic flow is studied. An enriched4-noded quadrilateral element based on field consistency approach is used forthis study and the crack is modelled independent of the underlying mesh. Thematerial properties are assumed to be temperature dependent and graded only inthe thickness direction. The effective material properties are estimated usingthe rule of mixtures. The formulation is based on the first order sheardeformation theory and the shear correction factors are evaluated employing theenergy equivalence principle. The influence of the crack length, the crackorientation, the flow angle and the gradient index on the aerodynamic pressureand the frequency are numerically studied. The results obtained here revealthat the critical frequency and the critical pressure decreases with increasein crack length and it is minimum when the crack is aligned to the flow angle.
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