Square shoulder with fillet in circular shaft for elastic stress, torsion
s_formulas_for_Stress_and_Strain/Stress_concentration_factors_for_elastic_stress_(TABLE_17(and46)1)/Square shoulder with fillet in circular shaft.svg "Square_shoulder_with_fillet_in_circular_shaft")
Values for calculation
Calculation
Coefficient $ C_1 $
$$C_1=0.953+0.680\cdot\sqrt{h/r}-0.053\cdot h/r$$
Coefficient $ C_2 $
$$C_2=-0.493-1.820\cdot\sqrt{h/r}+0.517\cdot h/r$$
Coefficient $ C_3 $
$$C_3=1.621+0.908\cdot\sqrt{h/r}-0.529\cdot h/r$$
Coefficient $ C_4 $
$$C_4=-1.081+0.232\cdot\sqrt{h/r}+0.065\cdot h/r$$
The elastic stress concentration factor
$$K_t=C_1+C_2\cdot\left(\cfrac{2\cdot h}{D}\right)+C_3\cdot\left(\cfrac{2\cdot h}{D}\right)^2+C_4\cdot\left(\cfrac{2\cdot h}{D}\right)^3$$