| Summary: | 碩士 === 國立成功大學 === 機械工程學系 === 103 === The present study designs double-layered functionally graded hollow disks in press-fit problem. Young’s modulus, density and coefficient of expansion are assumed as power functions along the radial direction, while Poisson’s ratio remains constant. According to the infinitesimal theory of elasticity, the exact solutions of stress in single-layered functionally graded hollow disks under (1) internal and external pressures; (2) rotation; (3) uniform temperature are derived. Furthermore, the same conditions are also discussed in double-layered functionally graded hollow disks, and the effect of inhomogeneity on the stress field is shown with figures and tables. The failure envelope with different materials such as steel and ceramics in double-layered functionally graded hollow disks are shown. Finally, the critical crack length can be predicted by using the theory of fracture mechanics.
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