Fatigue Stress Concentration Factor

And so in fatigue we can use a reduced version of kt called kf. The hot spot stress concentration factor is presented as a function of the following shape and internal force parameters k hs f ϑ ρ γ where ϑ t f t w is the flange thickness to web thickness ratio ρ r t f is the hole radius to flange thickness ratio γ fw m b is the internal force ratio t f and t w are the thicknesses of flange and web r is the cope hole radius f and m b are the transverse force and the bending moment in the cross section with the cope hole and w is. Stress concentration factor is defined by the following equation.

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ł convenient to think of kf as a stress concentration factor reduced from kt because of lessened sensitivity to notches.

Fatigue stress concentration factor. The fatigue stress concentration factor kf can be deﬁ ned from the ratio of fatigue strength of the smooth member to that of the notched member. K f 1 q k t 1 where k t designis the theoretical stress concentration factor for the given geometry and q is the notch sensitivity ratio of the material. It is also often referred to as the fatigue notch factor. The factor kf is called fatigue stress concentration factor.

So first off the fatigue stress concentration factor is referred to as capital k subscript f and what happens is that the certain materials are more resistant to notches and discontinuities. It is convenient to think of kf as a reduced value of kt due to reduced notch sensitivity. Fatigue stress concentration factors łkf is normally used in fatigue calculations but is sometimes used with static stresses. ł if notch sensitivity data is not available it is conservative to use kt in fatigue calculations.

A stress concentration often called stress raisers or stress risers is a location in an object where the stress is significantly greater than the surrounding region. Q kf 1 kt 1 kf is a reduced value of kt. For a notch sensitivity ratio of 1 the full stress concentration factor is used. The degree of concentration of a discontinuity under typically tensile loads can be expressed as a stress concentration factor.

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