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Fatigue stress concentration factor Kf of 316 stainless steel

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

Are you sure about Kf or are you interested in Kt? Stress concentration factors (Kt) are not material specific, they are based on geometry. If you need to calculate a Kt factor see the web site below;

http://www.fatiguecalculator.com/finders/findkt.htm


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

(OP)
This is a useful site, but I really need either Kf or notch sensitivity factor q for 316 stainless!

RE: Fatigue stress concentration factor Kf of 316 stainless steel

fairbairn;
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.

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