Steady state creep in a composite whisker reinforced disc with hyperbolically varying thickness in presence of residual stress

Abstract

Analysis of steady state creep in whisker-reinforced anisotropic rotating disc with residual stress has been carried out using isotropic/anisotropic Hoffman yield criterion in the present study. The variation of thickness of rotating composite disc is hyperbolic. Steady state creep behavior of the composite has been described by Sherby’s law. The material parameters of creep have been estimated by regression fit of the available experimental data. The results for isotropic disc (α=1) containing 20 vol% SiCw in a matrix of 6061Al alloy have been compared with those obtained for anisotropic composites with characteristic parameters α=0.7 and α=1.3, indicating strengthening or weakening in the tangential direction in composite disc presumably introduced by either processing or inhomogeneous distribution of reinforcement. It is concluded that a study of anisotropy in a rotating composite disc with the residual stress have important engineering consequences.