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Effect of Shot-Peening Variables and Residual Stresses on the Fatigue Life of Leaf-Spring Specimens
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English
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.
Some of the conclusions reached are:
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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.
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2.
Exposure time for this type of shot-peened specimen beyond some minimum value is wasteful and costly.
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3.
Shot size has little influence on fatigue life for these specimens.
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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.
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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.
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6.
There is a direct correlation between surface residual compressive stress and fatigue life of these specimens.