The Effect of Shot Peening on Fatigue Properties of a Die Cast Aluminium Alloy

Author:  B. Kurth, H. Bomas and P. Mayr
Source:  Conf Proc: ICSP-5, (p.154-165)
Doc ID:  1993069
Year of Publication:  1993
Abstract:  
Shot peening involves modifications of the surface and subsurface condition of a material that can be described by the change of the residual stresses, the hardness and the surface roughness. Moreover there is the possibility of introducing additional surface defects. The influence of these modifications on the fatigue behaviour of the aluminium die casting alloy GD-AISi8Cu3 is investigated. S-N curves are determined for four surface conditions produced by milling, shot peening, and combined treatment. The improvement of fatigue limit by shot peening is confirmed. The additional effect of mean stresses is determined. Pores and pipes as well as surface defects induced by shot peening act as fatigue crack initiation sites.