# Circular shaft with four flattened

## Values for calculation

## Calculation

### Height of the segment

### Coefficient $ C $

### Coefficient $ B $

### Polar moment of inertia

### Angle of twist

### Torsion stress

## Requirements

$$0\le\cfrac{h}{r}\le 0.293$$**On this page**

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$$h=r-W$$

$$C=0.7854-0.7\cdot\cfrac{h}{r}-7.7982\cdot\left(\cfrac{h}{r}\right)^2+14.578\cdot\left(\cfrac{h}{r}\right)^3$$

$$B=0.6366+2.6298\cdot\cfrac{h}{r}-5.6147\cdot\left(\cfrac{h}{r}\right)^2+30.853\cdot\left(\cfrac{h}{r}\right)^3$$

$$K=2\cdot C\cdot r^4$$

$$θ=\cfrac{T\cdot 10^3\cdot L}{K\cdot G}$$

$$τ_{max}=\cfrac{T\cdot10^3\cdot B}{r^3}$$