%0 Journal Article %T Radial vibration analysis of heterogeneous and non %A Naki Tutuncu %A Sefa Yildirim %J The Journal of Strain Analysis for Engineering Design %@ 2041-3130 %D 2018 %R 10.1177/0309324718765006 %X Free vibration analysis of heterogeneous (functionally graded) and non-uniform (variable thickness) disks using plane elasticity results in a two-point boundary value problem. Spatially varying mechanical and thickness properties yield variable coefficient governing differential equations where obtaining closed-form solutions are not possible except for certain simple grading and thickness functions. This article uses complementary functions method as a novel approach to determine natural frequencies of functionally graded non-uniform disks. The validation and observation of converges are done using analytical and ANSYS results for a simple power law model uniform disk. The proposed solution method can be applied for disks with any continuous thickness and material grading functions %K Vibration %K natural frequency %K complementary functions method %K functionally graded materials %K non-uniform disks %U https://journals.sagepub.com/doi/full/10.1177/0309324718765006