The knowledge of manufacture and analysis of Functionally Graded Materials (FGMs) provides the production of rotating discs with more optimized characteristics. These characteristics may include less weight and more stiffness that consequently getting more speeds in rotating discs. Thermal stresses can be destructive even in uniform and steady temperature in structures made of FGM due to the changes in material properties. This research studies the thermo-mechanical aspects of plastic limit speed in FGM discs. A FGM disc consisted of an elastic ceramic as reinforcement material and a bilinear elastic-plastic metal as matrix is modeled and studied. It is assumed that a power law function controls the volume fraction distribution of ceramic as well as the variations of the thickness. The techniques of solution are consisted of Variable Material Property (VMP) and Runge-Kutta methods. To validate the solutions, the results of the two methods are compared with the FEM solution of ANSYS software. Using different techniques the effects of temperature and material distribution on the plastic limit speed of FGM discs are investigated. The study shows the consequences of the presence and amount of ceramic in the failure of FGM discs.

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