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Tension strip with opposite semicircular edge notches

Strip with opposite semicircular edge notches H r P P h
Strip with opposite semicircular edge notches

Values for calculation

$ \{P\in\mathbb{R}\mid P>0\} $
This set includes all real numbers that are greater than zero. Therefore, it contains only positive numbers. Zero and negative numbers are not included in this set.
$ P $ $ \mathrm{N} $
$ \{r\in\mathbb{R}\mid r>0\} $
This set includes all real numbers that are greater than zero. Therefore, it contains only positive numbers. Zero and negative numbers are not included in this set.
$ r $ $ \mathrm{mm} $
$ \{H\in\mathbb{R}\mid H>0\} $
This set includes all real numbers that are greater than zero. Therefore, it contains only positive numbers. Zero and negative numbers are not included in this set.
$ H $ $ \mathrm{mm} $
$ \{h\in\mathbb{R}\mid h>0\} $
This set includes all real numbers that are greater than zero. Therefore, it contains only positive numbers. Zero and negative numbers are not included in this set.
$ h $ $ \mathrm{mm} $

Calculation

Stress concentration factor with the nominal stress based on net area

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

Nominal or reference normal stress

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

Maximum normal stress

$$σ_{max}=K_{tn}\cdot σ_{nom}$$
$σ_{max}=K_{tn}\cdot σ_{nom}$
Equations in LaTeX code
σ_{max}=K_{tn}\cdot σ_{nom}

Normal stress

$$σ=\cfrac{P}{h\cdot H}$$
$σ=\cfrac{P}{h\cdot H}$
Equations in LaTeX code
σ=\cfrac{P}{h\cdot H}

Stress concentration factor with the nominal stress based on gross area

$$K_{tg}=\cfrac{σ_{max}}{σ}$$
$K_{tg}=\cfrac{σ_{max}}{σ}$
Equations in LaTeX code
K_{tg}=\cfrac{σ_{max}}{σ}
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