Analytical model for predicting residual stresses in abrasive waterjet peening

• Theoretical model is proposed for predicting compressive residual stress in abrasive waterjet peening. Abrasive sizes, spatial position, and velocity distribution beam are considered prediction model. Material work hardening multiple overlapping impacts. on the workpiece depends number of peening, traverse speed, jet centre distance. Distribution predicted based peening surface topography. (AWJP) a new mechanical treatment where particles delivered by to induce plastic deformation achieve strengthening effects workpiece. Although fatigue strength can be improved inducing stress, remains challenging because particle–workpiece interaction occurs with randomicity, superposition, overlapping. In this paper, theoretical analysing i) non-uniform energy AWJP caused non-uniformity size, distribution, impact velocity; ii) material among impacts particles; iii) traces induced changing position beam. The experiments were conducted single-pass/multiple-pass/multiple-overlapping footprints different pump pressures, speeds, distances adjacent validate results showed good agreement roughness stress. Compressive increased pressure, whereas effect pressure change rate decreased when was increased; further, nearly constant variation speed distance it decreases certain value. These act as references control aid industrial manufacturing parameter optimisation (e.g. roughness, between two traces).