ANALYSIS OF DISTRIBUTIONS OF RESIDUAL STRESS AND STRAIN BENEATH A NOTCH AFTER ROLLING

The fatigue property of the notched part can be improved significantly by introducing compressive residual stress resulting from surface plastic deformation at the notch. The residual stress and strain distributions beneath the notch is predicted by using finite element methed (FEM) of large strain elasto-plastic analysis in this paper. It is investigated wheather the rolling process could be replaced by a plane-strain indenting with a model in the analysis. The effects of material strength, notch radius r. and indentation and depth △h on the distribution of residual stress and strain are discussed. The agreement of predicted and experimental results is good enough.