An aluminium rod is to withstand an applied force of 200 kN. To ensure a sufficient factor of safety, the maximum allowable stress on the rod is limited to 170 MPA. (170MN/m2) with a strain of 0.0025mm.mm-1.
The rod must be at least 3.8 m long but must deform elastically no more than 6 mm when the force is applied. Design an appropriate rod