Fatigue stress concentration factor Kf of 316 stainless steel
Fatigue stress concentration factor Kf of 316 stainless steel
(OP)
We have a corroded 316 SS shaft and we have ground out the corrosion. We could not exactly match radii in the FEA model, so I am looking for the stress concentraction factors Kf of 1.5mm and 2.5mm for 316 stainless.





RE: Fatigue stress concentration factor Kf of 316 stainless steel
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Kf = 1 + q(Kt-1)
q=notch radius (normally between 0 to 1). This value depends on material and notch radius.
RE: Fatigue stress concentration factor Kf of 316 stainless steel
RE: Fatigue stress concentration factor Kf of 316 stainless steel
There are published q (notch sensitivity) curves based on notch radius and material tensile strength. Once you locate the q value (see “Deformation and Fracture Mechanics of Engineering Materials”, Hertzberg, page 430). If you know the notch radius you can pick off the corresponding q value based on ultimate tensile strength. Once q is known use the equation above to determine Kf.