Non-destructive method for estimating residual stress distribution in component due to shot peening

A non-destructive method is proposed for estimating residual stress distrib ution in an object part due to shot peening. The method involves measuring the eigen strain distribution in a small test piece made of the same materi al and peened under the same shot peening conditions as the object part usi ng the layer removal technique, The residual stress distribution in the par t is calculated from this eigen strain. An experiment was carried out to es timate axisymmetric residual stresses in a shot peened cylinder. The result s measured directly from the cylinder show good agreement with the results predicted by the proposed method.