Effect of Shot Peening on Residual Life of Fatigue Pre-Damaged 2024 AI

Author:  T. Dorr, L. Wagner
Source:  Conf Proc: ICSP-6, (p.174-183)
Doc ID:  1996064
Year of Publication:  1996
Abstract:  
The residual life of fatigue pre-damaged 2024 AI in the stretched and naturally aged condition T3 was evaluated after shot peening. Depending on the shot peening intensity, fatigye induced initial crack depths of up to 1500um did not reduce residual life compared to the crack free electropolished reference. The results are explained in terms of the threshold behavior of surface cracks as affected by the interaction of the crack tip stress field and the loal residual stress values below the surface.