ABSTRACT
Residual stress significantly affects the engineering properties of materials and structural components notably fatigue life, distortion, dimensional, corrosion resistance, brittle fracture, and so forth. The thermal residual stresses induced due to thermal mismatch between the metal matrix and the ceramic reinforcement in metal matrix composite may impart plastic deformation to the matrix. In the present study, the steady-state creep has been investigated for composite rotating disc made of material 6061Al base alloy containing 20 vol% of SiC particle using isotropic/anisotropic Hoffman yield criterion and results are compared with those using von Mises yield criterion/Hill’s criterion ignoring the difference in yield stresses. The creep behavior has been described by Sherby’s constitutive model. Stress and strain rate distributions developed due to rotation have been calculated. It is concluded that the stress and strain distributions got affected from the thermal residual stress in an isotropic/anisotropic rotating disc, although the effect of residual stress on creep behavior in an anisotropic rotating disc is observed to be lower than those observed in an 192isotropic disc. Thus, the presence of residual stress in composite rotating disc with constant thickness needs attention for designing a disc.
