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$$K_{tn}=3.065-3.472\cdot\left(\cfrac{2\cdot r}{H}\right)+1.009\cdot\left(\cfrac{2\cdot r}{H}\right)^2+0.405\cdot\left(\cfrac{2\cdot r}{H}\right)^3$$

$$σ_{nom}=\cfrac{P}{\left(H-2\cdot r\right)\cdot h}$$

$$σ_{max}=K_{tn}\cdot σ_{nom}$$

$$σ=\cfrac{P}{h\cdot H}$$

$$K_{tg}=\cfrac{σ_{max}}{σ}$$