Electronics Incorporated - The Shot Peener - Shot Peening Library
Title: How Shot Peening Improves Strength
Author: Grover, H.J.
Source: SAE: Vol. 64, Nov. 9, 1956, p. 28-30
Publication year 1956
Document number: 1956002
Number of pages: 3
Abstract:
Three ways in which shot peening may be expected to influence fatigue strength are: 1) Surface Roughening; Each shot makes a slight indentation so that the peening operation
roughens a previously polished surface. This would be expected to lower the fatigue strength. 2) Surface Workhardening; Each indentation distorts the metal and produces
work hardening (and sometime other structural changes) in near surface layers. this may increase fatigue strength or in special cases may decrease it. 3) Residual Stresses;
the yielding of surface metal leaves macroscopic residual compressive stresses. These stresses are probably the most important factor in improving fatigue strength by shot
peening.
Order this document from SAE
www.shotpeener.com
This page last revised: 04/24/2008