Residual stress distribution measurements in shot peened aluminium plates

Residual stress measurements in 6082 aluminium plates subjected to two different shot peening intensities are presented and discussed. Measurements were performed by both the hole drilling method using a proper developed procedure and by X-ray diffraction. The results obtained by the different methods appeared in good agreement in the surface region, were X-ray diffraction could be applied The two different shot peening intensities showed a different depth extension of the region affected by treatment, where compressive residual stress were observed. Maximum compressive stresses of 190 MPa and 220 MPa were measured for the light and intense peening respectively.