Solid circular section

Formulas

Cross-sectional area

$$A = \frac{\pi\ d^2}{4}$$

Second moment of area

$$I = \frac{\pi\ d^4}{64}$$

Elastic section modulus

$$W_{\mathrm{el}} = \frac{\pi\ d^3}{32}$$

Plastic section modulus

$$W_{\mathrm{pl}} = \frac{d^3}{6}$$

Shear area

$$A_v = \frac{2\ A}{\pi}$$

Notations

• $d$diameter, in mm