Young's Modulus

*Young's modulus* can be thought of as the *spring constant
for solids*. Consider an ideal *rod* (or bar) of length
and
cross-sectional area
. Suppose we apply a force
to the face of
area
, causing a displacement
along the axis of the rod.
Then Young's modulus
is given by

where

For wood, Young's modulus is on the order of N/m . For aluminum, it is around (a bit higher than glass which is near ), and structural steel has [181].

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