RESIDUAL-STRESS MEASUREMENT TECHNIQUES - STUDY ON IMPROVEMENT IN FATIGUE-STRENGTH OF ALUMINUM-ALLOYS USED IN AERONAUTICS

This study takes place in a broader theme concerning the control of re sidual stresses in parts made of aluminum alloys in the aeronautical f ield Through the example of stress roll operation, the difficulties in measuring residual stresses in real parts with complex shapes are pre sented The hole drilling strain gagemethod is compared with the X-ray diffraction method. In spite of the limitations inherent to scaling, t he parameters influencing the stress roll process were inventoried and their effets quntified on normalised specimens to characterize the fa tigue behaviour of stress rolled specimens.