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Title: Effect Of Shot-peening Variables And Residual Stresses On The Fatigue Life Of Leaf-spring Specimens
Author: Mattson, R.L. and Coleman, Jr.,V.S.
Source: SAE: Trans. 1954, Vol. 62, p. 546-556
Publication year 1954
Document number: 1954001
Number of pages: 11
Abstract:
Results of an investigation into the effect of shot-peening variables and the resulting residual stresses on fatigue life are reported in this paper. Leaf springs were the
simple specimens heat-treated, cold worked, and tested in this study.
S
ome of the conclusions reached are:
1
. There is a minimum shot velocity for each shot size to obtain best fatigue life, and this value is much lower than that normally used.
2
. Exposure time for this type of shot-peened specimen beyond some minimum value is wasteful and costly.
3
. Shot size has little influence on fatigue life for these specimens.
4
. Shot peening specimens while under tensile strain greatly increases fatigue life at 200,000 psi nominal stress over that of nonpeened or strain-free-peened specimens.
5
. Shot peening these specimens gave residual compressive stresses 50% of yield strength, and these stresses can be increased to more than 50% by strain peening.
6
. There is a direct correlation between surface residual compressive stress and fatigue life of these specimens.
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This page last revised: 04/24/2008