Effect of silicon-carbide micro-nano particle size on thermo-elastic and time-dependent creep response of Al-SiC composite rotating cylinder

چکیده مقاله

History of stresses and creep strains of a composite rotating cylinder made of aluminum matrix reinforced by silicon carbide particles is investigated. The effect of uniformly distributed 20% SiC micro-nano particles on initial thermo-elastic and time-dependent creep deformation has been studied. The material creep behavior is described by Sherby’s constitutive model in which the creep parameters are functions of temperature, particle content and particle sizes from 50 nano-meters to 45.9 micron. Loading is composed of a temperature field due to outward steady-state heat conduction and an inertia body force due to rotation. Using equilibrium equation, stress-strain and strain-displacement relations a constitutive second order differential equation for displacement with variable and time-dependent coefficients is obtained. Solving this differential equation together with Prandtl-Reuss relation and the material creep constitutive model, history of stresses and creep strains are obtained and illustrated. It has been found that the minimum effective stress distribution of a uniformly distributed 20% SiC belongs to 50 nm particle size. It has also been found that the effective and tangential stresses are increasing with time at the inner surface of the composite cylinder, however their variation at the outer surface is not considerable.