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Title: Effect of Shot Peening on Residual Stress and Fatigue Life of a Spring Steel
Author: G.H. Farrah, L.L. Lebrun and D. Couratin
Source: Fatigue & Fracture of Engineering Materials & Structures Ltd., p.211-220
Publication year 1995
Document number: 1995040
Number of pages: 10
Abstract:
This study describes shot peening effects such as shot hardness, shot size and shot projection pressure, on the residual stress distribution and fatigue life in reversed
torsion of a 60SC7 spring steel. There appears to be a correlation between the fatigue strength and the area under the residual stress distribution curve. The biggest shot
shows the best fatigue life improvement. However, for a shorter time of shot peening, small hard shot showed the best performance. Moreover, the superficial residual
stresses and the amount of work hardening (characterised by the width of the X-ray diffraction line) do not remain stable during fatigue cycling. Indeed they decrease and
their reduction rate is a function of the cyclic stress level and an inverse function of the depth of the plastically deformed surface layer.
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