Modeling Steady State Creep in Functionally Graded Thick Cylinder Subjected to Internal Pressure

Abstract

The steady state creep behavior in an isotropic functionally graded composite cylinder, subjected to internal pressure has been investigated. The cylinder is assumed to be made of composite containing silicon carbide particles in a matrix of pure aluminum. The creep behavior of the material has been described by threshold stress based creep law with a stress exponent of five. The effect of imposing linear particle gradient on the distribution of stress and strain rates in the composite cylinder has been investigated. The study reveals that for the assumed linear particle distribution, the radial stress decreases throughout the cylinder with increase in particle gradient, whereas the tangential, axial, and effective stresses increase significantly near the inner radius but show significant decrease toward the outer radius. The strain rates in the composite cylinder could be reduced significantly by employing gradient in the distribution of reinforcement while keeping the same average amount of reinforcement.