Creep analysis in FGM rotating disks using Generalized Differential Quadrature method (GDQ)

In this paper steady state creep deformation of FGM rotating disk made of Al-SiC is analyzed using GDQ method. Creep is modeled using Sherby's model. All parameters in this model are dependent on the volume fraction of Aluminum and Silicon Carbide particles, temperature and particle size. Also all thermal and mechanical parameters of disk are defined as a function of volume fraction and the parameter of particle contents using an appropriate mixture rule. Using the equilibrium equations, constituent equations and strain-displacement equations, creep governing equation of rotating disk is derived based on displacements and then solved using a new solution algorithm and Generalized Differential Quadrature Method. Stress and creep strain variations in disk with the various distribution of particle content are achieved and the effect of the type of particle distribution on creep behavior of rotating disk is studied. Results illustrate that the disk with the linear distribution of particles has the highest value of creep and displacement rates therefore it is appropriate to use the non-linear distribution of particle contents.