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Calculate the fatigue stress concentration for a steel filleted shaft that is loaded in bending. Given Data: Sut = 440 MPa D (for larger cross-section) = 64 mm d (for smaller cross-section) = 32 mm r(fillet radius) = 4 mm

Respuesta :

Answer:

[tex]K_f = 1.422[/tex]

Explanation:

We know that relationship between fatigue and stress concentration factor

[tex]K_f = 1+q(K_t-1)[/tex]

Where

[tex]K_f[/tex]=fatigue concentration factor

[tex]K_t[/tex]=stress concentration factor

q=Notch sensitivity

Here D/d=2 and r/d=0.125

Now from standard design data book [tex]K_t=1.79[/tex]

For Sut=440 MPa and r= 4 mm

   q=0.8

Now by putting the values

[tex]K_f = 1+q(K_t-1)[/tex]

[tex]K_f = 1.8(1.79-1)[/tex]

[tex]K_f = 1.422[/tex]

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