Abstract
Considering the current controversy about the key indicators of surface roughness, this paper presents an indirect evaluation of the equivalent notch root radius of the surface profile. Using this method, the influence of surface roughness on fatigue strength on GH4169 is studied. Various sets of specimens with different fabrication conditions are machined to get a wide range of surface roughness. Vacuum annealing treatment is conducted on some of the specimens to eliminate the effect of residual stresses. Different classical formulae for stress concentration factor based on the notch root radius of the surface profile are used and the fatigue life reduction factor for various surface roughness values is presented. The results show that no single direct index of surface profile can determine the fatigue strength, but the indirect indexes, the notch bottom radius and the stress concentration factor can be used. The surface notch roots radiusρ is the key to the stress concentration coefficient. Using the arch-height & chord - length formula proposed in this paper to evaluate ρ, the linear fitting goodness of the stress concentration coefficient and the fatigue strength reaches 0.9.
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