Question

A square steel bar ol 50 mm side and 5 m long is subjected to a load where upon it absorbs a strain energy of 100 J. What is its modulus of resilience?

• A. $\frac{1}{125}N-mm/m{m}^3$
• B. $\frac{1}{125}m{m}^3/N-mm$
• C. $\frac{1}{100}N-mm/m{m}^3$
• D. $100m{m}^3/N-mm$

Answer 1

The correct option is A $\frac{1}{125}N-mm/m{m}^3$

Modulus of resilience is the strain energy stored in the material per unit volume.
$u=\frac{U}{V}=\frac{100\times {10}^3}{50\times 50\times 5\times 1000}$
$=\frac{1}{125}N-mm/m{m}^3$