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ANALYSIS OF CREEP EFFECTS ON THE RESIDUAL STRESS IN SCS-6/Ti-6Al-4V COMPOSITES USING FEM

The effect of creep phenomenon on the stress and displacement states of an SCS-6/Ti-6Al-4V composite after cooling from the processing temperature is investigated using the three-dimensional finite element method (FEM). The thermal stresses near the free surface and at the interior of the composite are analyzed assuming temperature-dependent thermomechanical properties of the composite constituents. The influence of the cooling rate on the residual stresses is discussed in detail. At low rates, the presence of creep strains reduces the stress level significantly and essentially eliminates the plastic strains. Increasing the cooling rate decreases the creep strains but increases the stresses. Only at a very high cooling rate do the residual stresses approach the level obtained from the corresponding elastoplastic analysis. The residual deformation states, however, seem to be much less sensitive to the cooling rate and to creep strains in general. These states remain always similar to the deformations calculated from the elastoplastic analysis, independent of the amount of creep strains accumulated. Therefore, any experiments that use the displacement or strain measurements for verification of the residual stress levels are generally expected to be difficult.