A series of elasticity solutions for flexural responses of functionally graded annular sector plates

•Based on extended England-Spencer plate theory, flexural responses of FG annular sector plates with two radial edges simply supported subjected to biharmonic loads are studied, where the material parameters can be varied arbitrarily along thickness direction.•3D elasticity solutions are obtained by expanding biharmonic loads in terms of Fourier series via complex variable method.•Two typical biharmonic loads are taken to reveal the effects of material gradient index, boundary conditions and thickness-to-radius ratio on the flexural responses of the plate.