Question

A cantilever beam has the square cross section of $10mm\times 10mm$. It carries a transeverse load of 10N. Considering only the bottom fibres of the beam, the correct representation of the logitudinal variation of the bending stress is

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

The bending moment varies from zero to 10Nm along the length of the beam from the centre of the beam,

$\therefore \sigma =\frac{M}{I}\times y_{max}$

$=\frac{10\times {10}^3}{\frac{{10}^4}{12}}\times \frac{10}{2}=60MPa$