# Elongation Percentage

Written by Jerry Ratzlaff on . Posted in Classical Mechanics

Elongation percentage, abbreviated as E_p, a dimensionless number, is the percentage of elongation at the fracture.

## Elongation Percentage Formula

$$\large{ E_p = \frac{ \left( l_f \;-\; l_i \right) \; 100 }{ l_i } }$$
Symbol English Metric
$$\large{ E_p }$$ = elongation percentage $$\large{ dimensionless }$$
$$\large{ l_i }$$ = initial length $$\large{ ft }$$ $$\large{ m }$$
$$\large{ l_f }$$ = length of fracture $$\large{ ft }$$ $$\large{ m }$$