Saad has completed his PhD at the age of 35 years from Atilim University in Turkey / 2015. His thesis related to functionally graded materials. He returned to his country in the north of Iraq and started to teach and research at the Civil Department in the Erbil Techncial Engineering College
In this study, analytical solutions are presented for the polar orthotropic functionally graded annular disks having variable profile and rotating with constant angular velocity. The formulations are performed by referring to polar coordinate system. Small deformations, state of plane stress and rotational symmetry are presumed in the formulations. Elasticity moduli, disk thickness and density vary radially according to power law while Poisson’s ratios are constant valued. Rotating disks having two different types of boundary conditions are studied. These are (i) annular disks having traction free inner and outer surfaces, and, (ii) annular disks mounted on a circular rigid shaft having traction free outer surface. Two sample problems are presented that accounts the solutions developed for the two different boundary conditions considered in the study. The stress and displacement profiles are determined at the elastic limit angular velocities which are evaluated according to Hill’s quadratic yield criteria. The effects of the degree of orthotropy are also examined.