# Yield Strength

Written by Matt Milbury on . Posted in Classical Mechanics

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

$$\large{ \sigma = \frac{F}{A_c} }$$
Symbol English Metric
$$\large{ \sigma }$$  (Greek symbol sigma) = yield strength $$\large{\frac{lbf}{in^2}}$$   $$\large{Pa}$$
$$\large{ A_c }$$ = area cross-section $$\large{ in^2 }$$ $$\large{ mm^2 }$$
$$\large{ F }$$ = force $$\large{ lbf }$$ $$\large{ N }$$