# Yield Strength

Written by Matt Milbury on . Posted in Pipe

Yield strength, abbreviated as $$\sigma$$ (Greek symbol sigma), also called yield stress, is the minimum stress that leads to permanent deformation of the material.

### Yield Strength formula

$$\large{ \sigma = \frac{F}{A_c} }$$

Where:

$$\large{ \sigma }$$  (Greek symbol sigma) = yield strength

$$\large{ A_c }$$ = area cross-section

$$\large{ F }$$ = force