, Volume 25, Issue 3, pp 827-836
Date: 22 May 2011

Temperature and thickness effects on thermal and mechanical stresses of rotating FG-disks

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Abstract

In the present paper, radial and hoop thermal and mechanical stress analysis of a rotating disk made of functionally graded material (FGM) with variable thickness is carried out by using finite element method (FEM). To model the disk by FEM, one-dimensional two-degree elements with three nodes are used. It is assumed that the material properties, such as elastic modulus, Poisson’s ratio and thermal expansion coefficient, are considered to vary using a power law function in the radial direction. The geometrical and boundary conditions are in the shape of two models including thermal stress (model-A) and mechanical stress (model-B). In model-A there exists no pressure in both external and internal layers, and there is a temperature distribution considered as a second order function in the radial direction of the rotating disk. In this case, the temperature dependency of the material properties is considered and a hyperbolic type is assumed for the geometry of the disk. In model-B, there is a constant pressure only on the internal layer and a pressure on the internal layer of the disk without temperature distribution but with different types of surface profiles. Furthermore, the displacements and stresses for various power law indices (N) and angular velocities are calculated and compared to other results in the literature. The effect of varying thicknesses and dependency of material properties on temperature distribution is investigated.

This paper was recommended for publication in revised form by Editor Maenghyo Cho
Mehrnoosh Damircheli received her B.S. in Mechanical Engineering from Kerman University (shahid bahonar), Iran, in 1999. She then earned her M.S. from Islamic Azad University South Tehran Branch in 2002. She is currently a Ph.D candidate at Islamic Azad University science and research branch in Tehran. Her research interests include Nano Robotic, AFM (atomic force microscoe), Composites (especially FGMs), FEM (Finite Element Method), Vibration and effects of higher hamonics exicitation, chaotic and control.
Mohammad Azadi received his B.S. in Mechanical Engineering from Shiraz University, Iran, in 2006. He then received his M.S. from K.N. Toosi University of Technology in 2008. He is currently a Ph.D candidate at Sharif University of Technology. His research interests include NVH (Noise, Vibration and Harshness), Composites (especially FGMs), FEM (Finite Element Method), automotive engineering (especially engines and vehicle structure), TBC (Thermal Barrier Coating) and fatigue including HCF (High Cycle Fatigue), LCF (Low Cycle Fatigue) and TMF (Thermo-Mechanical Fatigue).