Stress

Definition

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

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