Thermoelastic creep analysis of a functionally graded various thickness rotating disk with temperature-dependent material properties

• We model thermoelastic creep behavior of FG rotating disk with various thickness.
• We examine the temperature dependency of material properties on the results.
• We conclude that considering this dependency through the FG disk radius is necessary.
• Neglecting temperature dependency of properties causes a high error into the results.

A semi-analytical solution for rotating axisymmetric disks made of functionally graded materials was previously proposed by Hosseini Kordkheili and Naghdabadi [1]. In the present work the solution is employed to study thermoelastic creep behavior of the functionally graded rotating disks with variable thickness in to the time domain. The rate type governing differential equations for the considered structure are derived and analytically solved in terms of rate of strain as a reduced to a set of linear algebraic equations. The advantage of this method is to avoid simplifications and restrictions which are normally associated with other creep solution techniques in the literature. The thermal and structural properties of the base metal are also considered as a function of temperature. It is noted that ignoring the temperature dependency of these properties caused up to 200% errors in the creep solution results. Also, results for the strain rates presented due to centrifugal force and thermal loadings for different disk cross section profiles as well as different boundary conditions. Results obtained within this solution are verified with those available in the literature for easier cases.