Two U-notches in a member of rectangular section for elastic stress, out-of-plane bending
s_formulas_for_Stress_and_Strain/Stress_concentration_factors_for_elastic_stress_(TABLE_17(and46)1)/Two U-notches in a member of rectangular section.svg "Two_U-notches_in_a_member_of_rectangular_section")
Values for calculation
Calculation
Coefficient $ C_1 $
$$C_1=1.031+0.831\cdot\sqrt{h/r}+0.014\cdot h/r$$
Coefficient $ C_2 $
$$C_2=-1.227-1.646\cdot\sqrt{h/r}+0.117\cdot h/r$$
Coefficient $ C_3 $
$$C_3=3.337-0.750\cdot\sqrt{h/r}+0.469\cdot h/r$$
Coefficient $ C_4 $
$$C_4=-2.141+1.566\cdot\sqrt{h/r}-0.600\cdot h/r$$
The elastic stress concentration factor
$$K_t=C_1+C_2\cdot\left(\cfrac{2\cdot h}{D}\right)+C_3\cdot\left(\cfrac{2\cdot h}{D}\right)^2+C_4\cdot\left(\cfrac{2\cdot h}{D}\right)^3$$