Stress

Definition

$P=$ 1	force applied
$A=$ 1	area of cross section
$E=$ 200	elastic modulus
$\sigma =\frac{P}{A}=$ 1	normal stress
$ϵ=\frac{\sigma }{E}=$ 0.005	strain
$U=E\cdot ϵ=$ 0.0025	energy