# Central circular hole in a member of rectangular cross section for elastic stress, axial tension

## Values for calculation

## Calculation

### The elastic stress concentration factor

### Nominal or reference normal stress

### Maximum normal stress

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$$K_t=3-3.13\cdot\left(\cfrac{2\cdot r}{D}\right)+3.66\cdot\left(\cfrac{2\cdot r}{D}\right)^2-1.53\cdot\left(\cfrac{2\cdot r}{D}\right)^3$$

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

$$σ_{max}=K_t\cdot σ_{nom}$$