Abstract
In this paper are described fatigue tests carried out to determine the fatigue strength of artificially cracked specimens made from mild steel, 0.45% C steel, 13Cr steel and Ni-Cr steel under rotary bending. Axially cracked specimens gave considerably lower fatigue strengthreduction factors, compared with that of partial circumferentially cracked or round cracked specimens, which have the value 2.4-3.4 when crack length or depth is nearly equal to 2 mm. The strength-reduction factor of a specimen with semicircular groove containing axial or circumferential cracks is equal to the product of the strength-reduction factor of the notch itself and that of the crack itself. And then the reduction factor depending on the diameter of artificially cracked specimens is nearly equal to 1.1. The shot peening process gave an increased fatigue strength of 18% for mild steel and 30% for Ni-Cr steel specimens with artificial cracks.
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