Investigation of Different Material Distributions and Thermal Boundary Conditions on Stress Field of FGM Rotating Hollow Disk

This study aims at investigation the effects of material distribution and thermal boundary condition on stress field of FGM rotating hollow disk. For this purpose, three different problems with four distribution functions for material properties and three different thermal boundary conditions have been applied. Young’s modulus, density, and coefficient of thermal expansion distributions are defined as functions of the radius, and Poisson's ratio is assumed uniformly because it has equal value in two considered materials. The first, with assumption of elastic perfectly plastic behavior for material, disk plastic area rate with linear, power, exponential, and logarithmic material property distributions at three different temperature boundary conditions is studied and the best distribution for minimizing plastic area is detected. In the following with the assumption of constant rotational speed, thermal boundary conditions and external and internal radius of the disc, by utilizing criterion Von-Mises stress and the Taguchi method, the distribution of material properties for minimizing the maximum Von-Mises stress in each of the thermal boundary conditions is introduced. Finally, the sensitivity of Von Mises stress subject to the rotational speed, thermal boundary conditions, and material properties of the inner and outer radii is investigated by utilizing the Taguchi method. It’s concluded that the sensitivity of maximum Von-Mises stress to temperature distribution is more than to material distribution and rotating speed.