A bar of mild steel has an overall length of 2.1 m. The diameter up to 700 mm length is 56 mm, the diameter of the remaining 1.4 m is 35 mm. Calculate the extension of the bar due to a tensile load of 55 kN.E = 200 GN/m2
Therefore, for portion of 700 mm,
Now dl2 for 1400 mm length of 35 mm dia
