# Tension bar with infinite rows of semicircular edge notches

## Values for calculation

$P$ $\mathrm{N}$
$H$ $\mathrm{mm}$
$h$ $\mathrm{mm}$
$d$ $\mathrm{mm}$
$a$ $\mathrm{mm}$
$b$ $\mathrm{mm}$

## Calculation

### Coefficient $C_1$

$$C_1=3.1055-3.4287\cdot\left(\cfrac{a}{H}\right)+0.8522\cdot\left(\cfrac{a}{H}\right)^2$$

### Coefficient $C_2$

$$C_2=-1.4370+10.5053\cdot\left(\cfrac{a}{H}\right)-8.7547\cdot\left(\cfrac{a}{H}\right)^2-19.6273\cdot\left(\cfrac{a}{H}\right)^3$$

### Coefficient $C_3$

$$C_3=-1.6753-14.0851\cdot\left(\cfrac{a}{H}\right)+43.6575\cdot\left(\cfrac{a}{H}\right)^2$$

### Coefficient $C_4$

$$C_4=1.7207+5.7974\cdot\left(\cfrac{a}{H}\right)-27.7463\cdot\left(\cfrac{a}{H}\right)^2+6.0444\cdot\left(\cfrac{a}{H}\right)^3$$

### Stress concentration factor with the nominal stress based on net area

$$K_{tn}=C_1+C_2\cdot\left(\cfrac{a}{b}\right)+C_3\cdot\left(\cfrac{a}{b}\right)^2+C_4\cdot\left(\cfrac{a}{b}\right)^3$$

### Nominal or reference normal stress

$$σ_{nom}=\cfrac{P}{h\cdot d}$$

### Maximum normal stress

$$σ_{max}=K_{tn}\cdot σ_{nom}$$

### Normal stress

$$σ=\cfrac{P}{h\cdot H}$$

### Stress concentration factor with the nominal stress based on gross area

$$K_{tg}=\cfrac{σ_{max}}{σ}$$