Elliptical or U-shaped notch in a semi-infinite thin element in tension

Elliptical notch t r σ σ σ max
Elliptical notch
U-shaped notch t r σ σ σ max
U-shaped notch

Values for calculation

$r$ $\mathrm{mm}$
$t$ $\mathrm{mm}$
$σ$ $\mathrm{MPa}$


Stress concentration factor with the nominal stress based on gross area


Maximum normal stress

$$σ_{max}=K_{tg}\cdot σ$$