Water cavitation peening was a technique similar to shot peening that induces compressive residual stresses in materials for improved fatigue resistance. Generally, residual stress was of two types: macro-residual stress and micro-residual stress. Here, a novel combined finite-element method and dislocation density method was proposed for predicting macro and micro-residual stresses induced on the material sub-surface treated with water cavitation peening. A bilinear elastic–plastic finite element method was conducted to predict macro-residual stresses and a dislocation density method was conducted to predict micro-residual stresses. These approaches made possible the prediction of the magnitude and depth of residual stress fields in pure titanium. The effect of applied impact pressures on the residual stresses was also presented. The results of the finite element method and dislocation density method finite-element method and dislocation density modelling were in good agreement with those of the experimental measurements.

Combined Finite Element Method and Dislocation Density Method Solution to Residual Stress Induced by Water Cavitation Peening. B.Han, D.Y.Ju, X.G.Yu: Materials & Design, 2010, 31[7], 3317-23