Volume 17, Issue 5, 2008

LETTER: STRESS ANALYSIS OF FUNCTIONALLY GRADED ISOTROPIC ROTATING DISCS

Hasan Çallioglu

Department of Mechanical Engineering, Pamukkale University, 20070, Denizli, Turkey
E-mail: hcallioglu@pau.edu.tr

Received 14 January 2008; accepted 22 September 2008

ABSTRACT
The closed-form study deals with stress analysis of annular rotating discs made of functionally graded materials (FGMs) subjected to internal and external pressures. The elasticity modulus and density of the discs are assumed to varies radially according to three diverse power law functions, and it is assumed that the material is of constant Poisson’s ratio. A gradient parameter n is chosen between - 0.5 and 1.00. When n equals to zero, the disc becomes isotropic disc case. Dimensionless tangential and radial stresses and radial displacements in the rotating discs are depicted in the Fig.s and tabulated in a table. In present study, it is investigated how to change the distributions of the stresses and displacements with the increasing gradient parameter n (with variation of elasticity modulus and density). For a design problems if someone wants a disc which is of a homogenous stress distribution, he should chose either Disc 3 with n=1.00 or Disc 1 with n=-0.50 for the lowest stress distribution according to the results of this study for the material producer or applicability of production of the materials.

Keywords: fgm, isotropic disc, rotating disc, pressure, stress analysis