CREEP TRANSITION ANALYSIS IN FUNCTIONALLY GRADED THICK-WALLED ROTATING TRANSVERSELY ISOTROPIC CYLINDER UNDER A RADIAL TEMPERATURE GRADIENT AND UNIFORM PRESSURE

In this research paper, creep transition stresses and strain rates in a functionally graded thick-walled rotating transversely isotropic circular cylinder subjected to a radial temperature gradient and uniform internal pressure are derived using the transition theory of Seth and the generalized strain measure theory. The theory of Seth requires no assumptions such as the creep deformation is infinitesimally small, creep strain laws and the associated flow rules and this theory is important for determining creep transition stresses based on Lebesgue strain measure. The combined impacts of a non-homogeneity parameter, pressure, temperature, and angular speed are discussed numerically and shown graphically. It is concluded that a functionally graded thick-walled rotating cylinder subjected to a higher radial temperature gradient and a lower uniform pressure made of titanium material is on the safer side of the design compared to the cylinder made of steel material for smaller strain measure. The findings of this paper can be useful in the analysis and design of a cylinder that is exposed to high temperatures, such as high-speed structures involving aerodynamic heating, chemical plants and nuclear plants.