Mathematical Model of Creep Behavior in an Anisotropic Rotating Disc of Al-sicp with Thickness Variation in Presence of Thermal Residual Stress

Creep response in a rotating disc made of anisotropic Al-SiC(particle) composite having linearly varying thickness has been carried out using anisotropic Hoffman yield criterion in present study. The steady state creep behavior is described by Sherby’s constitutive model. The material parameters characterizing difference in yield stresses have been used from the available experimental results in literature. In the presence of residual stress, stress and strain rate distributions got affected for isotropic composites with characteristic parameters 1 = α and anisotropic composites with characteristic parameters 7 . 0 = α and 3 . 1 , 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 the change in the stresses by anisotropy in composite disc with residual stress is relatively small while anisotropy introduces significant change in the strain rates.