The Effects of Shot Size on the Residual Stresses Resulting from Shot Peening

Author:  G.T. Robertson, Chrysler Corp.
Source:  The Shot Peener magazine, Vol 11/Issue 3, September 1997
Doc ID:  1997050
Year of Publication:  1997
Abstract:  
Reprinted with permission SAE Technical Paper 710284 Society of Automotive Engineers, Inc. In the shot peening of automotive parts, it is desirable to obtain the best possible stress distribution for a particular application without creating an undesirable surface condition which would be deleterious to the life of the part. It is therefore important to understand the effects of the various shot peening variables, such as shot hardness, shot size, peening intensity etc., on the residual stress distribution and how the stress distribution relates to the fatigue strength of the part. This can be accomplished by isolating the shot peening variables and then determining the effect of each variable upon the fatigue strength when the part is subjected to various types of loading. This investigation was limited to obtaining information on the influence of shot size upon the residual stress and to gain an understanding of how this shot peening variable affects torsional fatigue strength.