First slide

Elastic Modulie

Question

The force (F)-extension ( $λ$ ), graph shows that the strain energy stored in the material under test, for an extension of 4 mm, is greater than which of the following values?

Moderate

A

80 mJ
B

60 mJ
C

40 mJ
D

None of these

Solution

Area under the curve represents strain energy stored and it is greater than 40 mJ.
Area under curve (straight line)
$= \frac{1}{2} . F . l$
$= \frac{1}{2} . (20) . (4 \times 10^{- 3}) J = 40 mJ$

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