Q4. A prismatic beam AB is subjected to a couple moment $M_o$ and an axial load P. By considering the normal stress only and using first principles, derive the general equation for the strain energy of the beam. The beam has a cross-sectional area of A, and a Young's Modulus of E.
P
D
$M_o$
a
b
L
B
P
[Q4: 91 marks]